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FAA Flight Engineer practice questions

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Question 1Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a reciprocating engine equipped with a float-type carburetor, what is the primary purpose of the economizer (power enrichment) valve?

  1. To prime the engine during cold starting
  2. To lean the mixture as altitude increases
  3. To maintain a constant idle RPM
  4. To enrich the mixture at high power settings for detonation protection and cooling Correct answer.

Explanation

The economizer valve opens at high throttle settings and adds extra fuel, enriching the mixture. This richer mixture helps suppress detonation and provides charge cooling when the engine is producing high power. At cruise settings the valve stays closed so the engine can run at a more economical mixture.

Question 2Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During the preflight walk-around of a turbojet aircraft, a mechanic notes that the engine oil quantity is being checked. Which statement about turbojet oil consumption is most accurate?

  1. Oil consumption is normal and small quantities are expected between checks Correct answer.
  2. Oil level should be at the top of the dipstick before every flight
  3. Oil is only used to lubricate the accessory gearbox
  4. Turbojets consume no oil because there is no reciprocating friction

Explanation

Turbojet and turbofan engines do consume some oil, primarily through seal leakage and normal bearing lubrication losses, so a small consumption rate between checks is expected. Maintenance manuals specify acceptable consumption limits. Overfilling can be as harmful as low level because it may cause foaming or seal leakage.

Question 3Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the function of the waste gate on a turbocharged reciprocating engine installation?

  1. It adjusts propeller blade angle as altitude changes
  2. It regulates exhaust gas flow through the turbocharger to control manifold pressure Correct answer.
  3. It meters fuel flow to the cylinders
  4. It controls oil pressure to the turbocharger bearings

Explanation

The waste gate is a valve that bypasses exhaust gas around the turbine. By opening or closing it, the system controls how much energy drives the compressor, thereby regulating manifold pressure. This prevents overboost at high power and helps maintain desired manifold pressure as altitude changes.

Question 4Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

In a constant-speed propeller system, what happens when the propeller governor senses an underspeed condition?

  1. It shuts off engine oil to the propeller
  2. It feathers the propeller automatically
  3. It increases oil pressure to the propeller dome to increase blade angle
  4. It decreases oil pressure to the propeller dome to decrease blade angle Correct answer.

Explanation

When RPM drops below the governor setting, the governor reduces oil pressure to the propeller, allowing centrifugal twisting moment and counterweights to move the blades toward low pitch. Lower pitch reduces blade load, allowing RPM to increase back toward the selected value.

Question 5Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

Which of the following best describes the purpose of the compressor bleed air system on a turbopropeller engine?

  1. To increase fuel flow during takeoff
  2. To lubricate the compressor bearings
  3. To supply air for pressurization, anti-icing, and engine cooling Correct answer.
  4. To cool the exhaust gas before it reaches the turbine

Explanation

Compressor bleed air is extracted from the compressor and used for cabin pressurization, air conditioning, anti-icing, and cooling of engine and accessory compartments. Bleeding air reduces engine performance, so it is managed carefully during critical phases. It is not used to cool exhaust gas or lubricate bearings.

Question 6Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

Before starting a reciprocating engine, why is it important to check that the magneto switch is in the OFF position and that the propeller area is clear?

  1. Because the starter will not engage if the switch is on
  2. Because magnetos are independent of the battery and a live magneto can fire the engine when the propeller is moved Correct answer.
  3. Because the fuel pump will overheat if the switch is on
  4. Because the propeller governor needs the switch off to set RPM

Explanation

Magnetos generate their own spark energy and are not dependent on the aircraft battery or master switch. If a magneto is live, moving the propeller can cause the engine to fire unexpectedly. Therefore the switch must be OFF and the propeller area clear before any handling.

Question 7Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the primary purpose of the fuel/air mixture control in a reciprocating engine installation?

  1. To control the turbocharger waste gate
  2. To set the propeller pitch
  3. To adjust the idle RPM setting
  4. To compensate for changes in air density as altitude changes Correct answer.

Explanation

As altitude increases, air density decreases, so the fuel/air mixture becomes richer unless corrected. The mixture control allows the pilot to lean the mixture to maintain the proper fuel-to-air ratio for efficient combustion. This is a key preflight and in-flight consideration for reciprocating engines.

Question 8Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

Which instrument provides the most direct indication of the power being developed by a turbojet engine during ground checks?

  1. Exhaust gas temperature gauge alone
  2. Manifold pressure gauge
  3. Engine pressure ratio (EPR) or fan/N1 speed indication Correct answer.
  4. Fuel quantity gauge

Explanation

Turbojet and turbofan power output is commonly indicated by engine pressure ratio or by fan/N1 spool speed, which directly reflect thrust produced. These indications are used for setting takeoff power and monitoring engine health. Manifold pressure applies to reciprocating engines, and fuel quantity does not indicate power.

Question 9Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a reciprocating engine is being prepared for a flight at a high-altitude airport on a hot day. Which preflight consideration is most important regarding engine operation?

  1. The mixture should be leaned for the density altitude to prevent excessively rich operation and rough running Correct answer.
  2. The waste gate should be manually locked closed
  3. The mixture should be fully rich to ensure maximum cooling
  4. The magnetos should be checked at high RPM only

Explanation

High density altitude reduces air density, making the mixture excessively rich if left full rich. Leaning for the existing density altitude improves combustion efficiency and smoothness. The pilot should follow the manufacturer's leaning procedure during taxi and runup.

Question 10Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a runup of a turbopropeller engine, the pilot advances the power lever and observes that the propeller does not reach the governed RPM. Which condition should be suspected?

  1. The compressor bleed valves are stuck open
  2. The propeller governor is not regulating properly or the beta valve is misrigged Correct answer.
  3. The fuel control unit is set too lean
  4. The ignition exciter has failed

Explanation

If the propeller fails to reach governed RPM when power is applied, the governor may not be regulating oil pressure correctly, or the beta/reverse system may be misrigged and limiting blade angle. Fuel scheduling and bleed valves affect power but not directly the governed RPM limit. This should be investigated before flight.

Question 11Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbojet engine, what is the purpose of the igniter system during normal operation after a successful start?

  1. It controls fuel flow to the combustor
  2. It is typically turned off because combustion is self-sustaining Correct answer.
  3. It remains on continuously to ensure combustion stability
  4. It is used only to drive the starter motor

Explanation

Once combustion is established, the flame is self-sustaining in the combustor, so igniters are normally switched off to extend their life. They are re-energized for specific conditions such as icing, turbulence, or low power settings per the operating manual. Igniters do not control fuel flow.

Question 12Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

A reciprocating engine shows a gradual drop in oil pressure during cruise while oil temperature remains normal. Which action is most appropriate?

  1. Ignore it because oil temperature is normal
  2. Reduce power, monitor the gauge, and plan to land at the nearest suitable airport if pressure continues to fall Correct answer.
  3. Continue cruise and monitor; a slow drop is always normal
  4. Increase power to raise oil pressure

Explanation

A gradual loss of oil pressure can indicate a developing leak, pump wear, or dilution problem and may precede engine failure. The prudent response is to reduce power to lessen stress, monitor indications, and prepare to land. Oil temperature remaining normal does not rule out a serious oil pressure problem.

Question 13Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the function of the beta range on a turbopropeller control system?

  1. It limits turbine inlet temperature
  2. It controls compressor bleed air for pressurization
  3. It sets the fuel schedule during start
  4. It provides ground fine, reverse, and beta-range blade angle control for taxi and braking Correct answer.

Explanation

The beta range allows the pilot to control propeller blade angle directly, from flight idle through ground fine and into reverse, which is used for taxiing and braking on the ground. It is distinct from the normal governing range used in flight. Beta operation is typically restricted to ground use.

Question 14Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During preflight of a turbojet aircraft, the engine inlet is inspected and foreign object debris is found. Why is this a critical finding?

  1. It only affects paint appearance
  2. It has no effect on engine operation
  3. Debris ingestion can damage compressor blades and cause imbalance or failure Correct answer.
  4. It improves airflow through the compressor

Explanation

Foreign object debris entering the compressor can nick or bend blades, causing imbalance, reduced efficiency, and potentially catastrophic failure. Inlet inspections are part of preflight to catch such hazards before start. Any significant damage must be evaluated by maintenance.

Question 15Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

In a fuel-injected reciprocating engine, what does the fuel flow divider (spider) do?

  1. It mixes fuel with oil for lubrication
  2. It controls the magneto timing
  3. It distributes metered fuel equally to each cylinder's injector nozzle Correct answer.
  4. It regulates the fuel pump pressure

Explanation

The flow divider receives metered fuel from the fuel control unit and distributes it to the individual cylinder injector lines. Equal distribution is important for balanced combustion and smooth operation. It does not regulate pump pressure or ignition timing.

Question 16Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft equipped with a turbofan engine is being prepared for flight in icing conditions. Which system should be verified during preflight?

  1. The mixture control is set to full rich
  2. The propeller governor is set to feather
  3. Engine anti-ice and inlet anti-ice systems are operational and selected as required Correct answer.
  4. The waste gate is locked open

Explanation

In icing conditions, engine and inlet anti-ice systems prevent ice accumulation that could disrupt airflow or damage the engine. Preflight verification ensures these systems function when needed. Waste gates, mixture controls, and propeller feathering apply to other engine types or functions.

Question 17Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the purpose of the torque indication on a turbopropeller aircraft during preflight and takeoff?

  1. It shows compressor discharge temperature
  2. It indicates the twisting force delivered to the propeller and is used to set takeoff power Correct answer.
  3. It displays fuel quantity
  4. It indicates cabin pressurization

Explanation

Torque is a measure of the twisting force applied to the propeller shaft and is a primary power indication for turboprop engines. Pilots use it to set and monitor takeoff and cruise power. It is distinct from temperature and fuel indications.

Question 18Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a preflight inspection of a reciprocating engine, the pilot finds that the alternator belt is loose. What is the most likely consequence if not corrected?

  1. Increased engine oil pressure
  2. Higher manifold pressure
  3. Reduced charging and possible overheating of the electrical system Correct answer.
  4. Improved fuel economy

Explanation

A loose alternator belt can slip, reducing charging output and potentially causing electrical system problems such as a discharged battery or overheating. It does not affect oil pressure, manifold pressure, or fuel economy. Maintenance should correct belt tension before flight.

Question 19Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbojet engine, what is the role of the fuel control unit (FCU)?

  1. It regulates cabin pressure
  2. It controls propeller pitch
  3. It manages the ignition timing
  4. It schedules fuel flow based on throttle position and engine parameters Correct answer.

Explanation

The fuel control unit meters and schedules fuel flow to the combustor based on throttle position, compressor speed, and other parameters. This ensures proper acceleration, deceleration, and steady-state operation. It does not control propeller pitch or cabin pressure.

Question 20Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

A reciprocating engine is equipped with both a carburetor heat system and a carburetor temperature gauge. During a preflight runup in humid conditions, the pilot notices carburetor temperature in the icing range. What is the appropriate action?

  1. Apply carburetor heat and monitor for smooth operation Correct answer.
  2. Ignore it because the engine is running smoothly
  3. Increase mixture richness to full rich and continue
  4. Shut down the engine immediately

Explanation

Carburetor icing can occur even at relatively warm temperatures when humidity is high. Applying carburetor heat melts ice and prevents further accumulation, and the pilot should monitor engine smoothness and temperature. Ignoring the indication risks sudden power loss.

Question 21Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the primary reason for monitoring exhaust gas temperature (EGT) on a turbojet engine during preflight and takeoff?

  1. To measure fuel quantity
  2. To set propeller RPM
  3. To check cabin altitude
  4. To ensure turbine temperatures remain within limits and detect abnormal combustion Correct answer.

Explanation

EGT reflects turbine inlet conditions and is used to prevent overheating and to detect abnormal combustion or fuel scheduling issues. Exceeding limits can damage hot section components. EGT does not measure fuel quantity or cabin altitude.

Question 22Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a turbocharged reciprocating engine is being prepared for a flight at a high-altitude airport. The pilot must consider the turbocharger's critical altitude. What does this term mean?

  1. The altitude above which the turbocharger can no longer maintain the selected manifold pressure Correct answer.
  2. The altitude at which the mixture must be full rich
  3. The altitude at which the propeller reaches governed RPM
  4. The altitude at which the waste gate fully opens

Explanation

Critical altitude is the highest altitude at which the turbocharger can still deliver the selected manifold pressure. Above it, manifold pressure falls off despite full throttle. This affects climb performance and leaning procedures at high-altitude airports.

Question 23Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a preflight inspection of a turbopropeller aircraft, the pilot notices that the propeller blades on one engine do not move freely when checked for the feathering system. What is the most likely implication?

  1. The compressor bleed valves are stuck closed
  2. The fuel control unit is set too rich
  3. The feathering system or governor may be malfunctioning, requiring maintenance before flight Correct answer.
  4. The engine oil level is too high

Explanation

Propeller blades that do not move freely during a feathering check suggest a problem with the governor, oil transfer, or feathering mechanism. This must be corrected before flight because feathering is critical for single-engine performance and shutdown. Fuel and bleed systems do not directly prevent blade movement.

Question 24Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

A turbojet engine experiences a hot start during ground starting. Which action should the pilot take immediately?

  1. Abort the start by shutting off fuel and continuing motoring to clear the engine Correct answer.
  2. Apply carburetor heat
  3. Feather the propeller
  4. Continue cranking and increase fuel flow

Explanation

A hot start means EGT is rising beyond limits, often due to excess fuel or insufficient airflow. The correct action is to shut off fuel and continue motoring with the starter to clear unburned fuel and cool the engine. Continuing the start or adding fuel risks damaging the hot section.

Question 25Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

In a reciprocating engine, what is the significance of the valve clearance specification during preflight preparation?

  1. Incorrect clearance can cause valve train wear or loss of compression and should be verified at maintenance intervals Correct answer.
  2. It sets the propeller pitch
  3. It determines fuel octane requirements
  4. It controls the magneto spark timing

Explanation

Valve clearance affects how fully valves open and close; incorrect clearance can cause noise, wear, or compression loss. It is verified during maintenance rather than daily preflight, but understanding it helps pilots recognize symptoms. It does not determine octane or ignition timing.

Question 26Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a reciprocating engine equipped with a fixed-pitch propeller, what does the manifold pressure gauge indicate during ground operation?

  1. Fuel pressure delivered to the carburetor float bowl
  2. Cylinder compression pressure during the compression stroke
  3. Oil pressure at the main bearing gallery
  4. Absolute pressure in the induction manifold, which reflects throttle opening and engine load Correct answer.

Explanation

Manifold pressure is an absolute pressure reading of the air in the induction system downstream of the throttle, so it rises toward ambient as the throttle opens and falls as the throttle closes. On a fixed-pitch propeller installation it is a useful load indicator, while on a constant-speed installation it is read together with RPM.

Question 27Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

Before flight in a turbojet-powered aircraft, which condition most directly indicates that the engine oil system is ready for the takeoff?

  1. Oil temperature remaining at ambient after start
  2. Oil quantity at the minimum dipstick mark
  3. Oil pressure within limits at the specified warm-up RPM after start Correct answer.
  4. Oil pressure pegged at the top of the green arc at idle

Explanation

The oil system is considered ready when pressure is stabilized within the normal range at the manufacturer's warm-up setting, which shows the pump is delivering and the system is not air-locked. Quantity at minimum is legal only if the minimum is the dispatch requirement, and a pegged gauge is not a normal indication.

Question 28Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the function of the compressor bleed valves on many turbojet and turbofan engines during start and low-power operation?

  1. They supply pressurization air to the cabin only at cruise
  2. They admit cooling air to the turbine section
  3. They dump fuel to prevent an overrich mixture during acceleration
  4. They vent excess compressor air overboard to prevent compressor stall at low RPM Correct answer.

Explanation

At low corrected speed the rear compressor stages operate at a high angle of attack relative to airflow and are prone to stall, so bleed valves open to reduce back pressure and stabilize the airflow. They close as engine speed and pressure ratio increase and the stall margin improves.

Question 29Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbopropeller aircraft, what is the purpose of the condition (start) lever as distinct from the power lever?

  1. It controls propeller RPM directly through the governor
  2. It sets the cabin pressurization schedule
  3. It selects the fuel scheduling range, such as start, run, or feather, while the power lever sets power Correct answer.
  4. It selects the ignition exciter channel

Explanation

On many turboprop installations the condition lever controls fuel on/off and the operating range of the fuel control unit, while the power lever positions the fuel metering valve for the desired torque or power. Keeping these functions separate allows the engine to be started and shut down without moving the power lever.

Question 30Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a preflight inspection of a reciprocating engine, the oil cooler air inlet is found partially blocked by a bird nest. What is the most likely consequence if the aircraft is dispatched without correction?

  1. Elevated oil temperature because the cooler cannot reject heat adequately Correct answer.
  2. Low oil pressure because the pump loses its prime
  3. Higher manifold pressure because the induction air is heated
  4. Excessive oil consumption because the breather is blocked

Explanation

The oil cooler depends on ram air passing through its core to transfer heat from the oil, so restricting the inlet reduces cooling capacity and oil temperature rises, especially in climb. Oil pressure and consumption are governed by the pump, clearances, and breather system rather than by cooler airflow.

Question 31Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What does the exhaust gas temperature gauge on a reciprocating engine primarily help the pilot establish during cruise?

  1. The oil viscosity grade
  2. The valve clearance
  3. The ignition timing advance
  4. The fuel/air mixture setting for best economy or best power Correct answer.

Explanation

Exhaust gas temperature peaks near stoichiometric mixture and falls on either side, so the pilot leans to a target EGT drop or peak value to set the mixture for economy or power. It is a mixture indicator, not a measure of timing, clearance, or oil condition.

Question 32Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbojet engine, what does a rising exhaust gas temperature with a falling or stagnant RPM during start most likely indicate?

  1. Normal acceleration toward idle
  2. A hot or hung start that requires immediate fuel shutoff Correct answer.
  3. A faulty tachometer only
  4. A normal rich mixture schedule

Explanation

During start, EGT should rise and then stabilize as RPM accelerates to idle. If EGT climbs while RPM fails to accelerate, the engine is not converting fuel energy into rotation and the start must be aborted by cutting fuel before turbine damage occurs.

Question 33Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the primary purpose of the fuel boost pumps in the fuel system of a turbine-powered aircraft?

  1. To supply fuel to the engine-driven pump at sufficient pressure to prevent vapor lock and cavitation Correct answer.
  2. To transfer fuel only during refueling
  3. To pressurize the fuel tanks for cabin pressurization
  4. To meter fuel flow to the combustor

Explanation

Boost pumps raise fuel pressure at the inlet of the engine-driven high-pressure pump, suppressing vapor formation at altitude and during hot-day operation. Metering is done by the fuel control unit, and tank pressurization is a separate function.

Question 34Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

A turbofan engine's fan blades show nicks and small dents along the leading edges at the preflight walkaround. Why is this significant for dispatch?

  1. Damage can reduce efficiency and may progress to blade failure, so limits in the maintenance manual must be applied Correct answer.
  2. Nicks improve airflow and require no action
  3. Only the compressor blades matter, so fan damage can be ignored
  4. Fan damage affects only the paint scheme and cosmetics

Explanation

Fan blades are highly stressed rotating parts, and leading-edge damage can initiate cracks, cause vibration, and degrade thrust and fuel efficiency. The maintenance manual defines allowable damage limits, and anything beyond them requires repair before flight.

Question 35Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbocharged reciprocating engine, what is the function of the wastegate?

  1. It controls oil flow to the turbocharger bearings
  2. It regulates fuel flow to the injectors
  3. It bypasses induction air around the intercooler
  4. It bypasses exhaust gas around the turbine to regulate boost pressure Correct answer.

Explanation

The wastegate is a valve in the exhaust path that modulates how much exhaust energy reaches the turbine, thereby controlling compressor speed and manifold pressure. Closing it increases boost, and opening it limits boost to the scheduled value.

Question 36Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a ground run of a turbopropeller engine, the propeller governor is set to a high RPM and the power lever is advanced. What should the pilot observe if the propeller is operating on speed?

  1. Both RPM and torque fall as the power lever advances
  2. Propeller RPM remains essentially constant while torque rises Correct answer.
  3. Torque remains constant while RPM rises
  4. Propeller RPM rises proportionally with the power lever

Explanation

Once the propeller reaches the RPM selected by the governor, the governor changes blade angle to absorb additional power, so RPM stays constant while torque and power increase. This is the normal on-speed condition and confirms the governor is governing.

Question 37Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the purpose of the igniter plugs on a turbojet engine being checked for proper gap and cleanliness during preflight preparation?

  1. To measure combustion chamber pressure
  2. To ensure reliable ignition of the fuel/air mixture during start and in the event of a flameout Correct answer.
  3. To preheat the fuel before it reaches the nozzles
  4. To provide continuous ignition for all flight phases

Explanation

Igniter plugs must produce a strong spark to light the fuel during start and to support relight after a flameout in adverse conditions. Contaminated or misgapped plugs weaken the spark, so servicing them protects start reliability.

Question 38Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a reciprocating engine is to be ferried with a known small oil leak at the rocker cover. Which preflight action is most appropriate?

  1. Evaluate the leak against the maintenance manual limits and correct it before flight if it exceeds them Correct answer.
  2. Increase the oil grade to stop the leak
  3. Reduce the oil quantity to lower internal pressure
  4. Ignore it because rocker cover leaks are always harmless

Explanation

Leak limits are published in the maintenance manual, and a leak within limits may be monitored while one beyond limits must be repaired. Changing oil grade or lowering quantity does not address the cause and can create new problems.

Question 39Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the function of the fuel manifold (fuel distributor) on a turbojet engine?

  1. It divides metered fuel among the individual fuel nozzles Correct answer.
  2. It filters contaminants from the fuel
  3. It meters total fuel flow to the engine
  4. It controls the fuel tank selection

Explanation

The fuel control unit meters the total flow, and the manifold or distributor then splits that flow to the burner nozzles so each receives an appropriate share. It does not perform metering, filtration, or tank selection.

Question 40Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbojet engine, what does a compressor pressure ratio that is lower than normal at a given RPM suggest during preflight ground checks?

  1. An overcharged cabin pressurization system
  2. A failed igniter plug
  3. A richer-than-normal fuel schedule
  4. Compressor efficiency loss, such as blade damage or excessive tip clearance Correct answer.

Explanation

Compressor pressure ratio is a measure of how well the compressor raises pressure at a given speed, so a low ratio points to aerodynamic degradation such as blade damage, erosion, or excessive clearances. Fuel schedule, cabin pressure, and ignition are separate systems that do not directly set compressor pressure ratio.

Question 41Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

Before starting a turbopropeller engine in cold weather, why is it important to verify that the engine oil is of the correct grade and that preheat requirements are met?

  1. Cold oil can prevent adequate lubrication and cause excessive starting torque or false start indications Correct answer.
  2. Cold oil reduces the compressor stall margin
  3. Cold oil changes the propeller blade angle
  4. Cold oil increases fuel octane

Explanation

At low temperature oil viscosity rises sharply, so it may not flow to bearings promptly and it increases drag on rotating components, raising starting torque and slowing acceleration. Manufacturers specify oil grades and preheat limits to keep starting loads and lubrication within safe bounds.

Question 42Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the purpose of the chip detector in the oil system of a turbine engine?

  1. To indicate oil quantity in the tank
  2. To attract and indicate the presence of ferrous metal particles in the oil Correct answer.
  3. To filter all contaminants from the oil
  4. To measure oil pressure at the pump outlet

Explanation

A magnetic chip detector collects ferrous debris so that inspection can reveal abnormal wear of gears, bearings, or other steel components. It is a diagnostic device, not a filter, pressure gauge, or quantity indicator.

Question 43Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a constant-speed propeller and reciprocating engine is being prepared for takeoff at a high-elevation airport. How should the pilot expect manifold pressure and propeller RPM to behave during the takeoff roll?

  1. Manifold pressure will be higher and RPM will overspeed
  2. Manifold pressure will be lower than at sea level for the same throttle position, and RPM will be governed at the set value Correct answer.
  3. Manifold pressure will be lower and RPM will rise above the governor setting
  4. Manifold pressure will be unchanged and RPM will be lower

Explanation

Because manifold pressure is an absolute pressure, it drops with ambient pressure at altitude, so full throttle yields less power. The propeller governor still holds RPM at the selected value, so RPM does not change with altitude unless the governor setting is changed.

Question 44Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

What is the function of the inlet guide vanes (IGV) on some turbojet and turbofan engines?

  1. To straighten exhaust flow for thrust
  2. To mix fuel with air before the combustor
  3. To support the turbine rotor bearings
  4. To direct airflow into the first compressor stage at an efficient angle across the operating range Correct answer.

Explanation

Inlet guide vanes turn the incoming air so it meets the first-stage rotor blades at the proper angle, improving efficiency and stall margin, and on variable designs they are scheduled with engine speed. They are not structural bearing supports, fuel mixers, or exhaust straighteners.

Question 45Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During preflight of a reciprocating engine, the pilot finds that the engine-driven fuel pump is leaking fuel at the drive seal area. Why is this treated as a serious discrepancy?

  1. The leak is normal until the engine warms up
  2. Fuel leakage improves cooling of the accessory case
  3. Fuel can enter the crankcase and dilute the oil, leading to loss of lubrication Correct answer.
  4. The leak only affects fuel quantity indication

Explanation

A failed drive seal allows fuel to pass into the engine crankcase, where it thins and contaminates the oil, reducing lubricating ability and raising the risk of internal damage. Fuel leaks are never acceptable as a normal warm-up condition.

Question 46Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

On a turbopropeller aircraft, what does the beta range allow the pilot to do during ground operation?

  1. Feather the propeller in flight
  2. Control propeller blade angle directly to modulate thrust, including reverse, without the governor limiting RPM Correct answer.
  3. Set the propeller governor to a higher RPM for takeoff
  4. Control compressor bleed valve position

Explanation

In beta range the pilot commands blade angle directly through the power lever, which allows fine thrust control, ground idle, and reverse thrust while the propeller is not governed. Feathering and takeoff RPM selection are handled outside beta range.

Question 47Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

A turbojet engine is being prepared for flight after maintenance that included replacement of a fuel nozzle. Which preflight or run-up observation best confirms the fuel system is delivering properly to all combustors?

  1. A slow but steady rise in oil temperature
  2. A single high EGT indication on the replaced nozzle only
  3. Uniform exhaust gas temperature spread and stable engine parameters at idle and part power Correct answer.
  4. Fuel pressure above the maximum limit at idle

Explanation

An even EGT spread across the engine and stable idle and part-power parameters indicate that all combustors are receiving and burning fuel similarly. A localized high EGT on one nozzle suggests a mismatch or blockage, and over-limit fuel pressure is a fault.

Question 48Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a turbofan engine is dispatched with a known small exhaust gas temperature indication discrepancy. Why must the pilot verify the accuracy of the EGT indication before accepting the aircraft?

  1. EGT is used to set takeoff power and monitor engine limits, so an inaccurate indication can lead to overtemp or overboost Correct answer.
  2. EGT accuracy is required only for reverse thrust operation
  3. EGT is used solely for maintenance trending and has no operational use
  4. EGT only drives the cabin temperature controller

Explanation

On turbine engines EGT is a primary limit parameter used to establish takeoff power and to protect the hot section from overtemperature, so a biased indication can cause the crew to exceed limits unknowingly. It is not tied to cabin temperature or limited to reverse operation.

Question 49Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

During a preflight inspection of a turbojet engine, the pilot observes that the variable stator vanes on the compressor do not move through their full scheduled range when the engine is motored. What is the most likely operational consequence?

  1. Reduced stall margin and possible compressor surge at low and transient power settings Correct answer.
  2. Increased oil consumption at cruise
  3. Loss of fuel metering accuracy
  4. Failure of the propeller governor to govern

Explanation

Variable stator vanes are scheduled to keep the compressor blades at an efficient angle of attack as speed and airflow change, so a vane system stuck or restricted reduces stall margin and can cause surge during acceleration or at low power. Oil consumption, fuel metering, and propeller governing are unrelated systems.

Question 50Preflight preparation and aircraft systems knowledge (reciprocating engine, turbopropeller, and turbojet powered aircraft)

An aircraft with a turbocharged reciprocating engine has a critical altitude of 18,000 feet. What happens to manifold pressure as the aircraft climbs above that altitude at full throttle?

  1. Manifold pressure increases because the air is colder
  2. Manifold pressure oscillates as the wastegate cycles
  3. Manifold pressure remains constant because the wastegate stays fully closed
  4. Manifold pressure decreases because the turbocharger can no longer maintain the scheduled boost Correct answer.

Explanation

Critical altitude is the highest altitude at which the turbocharger can produce the rated manifold pressure at full throttle, so above it the compressor reaches its limit and manifold pressure falls with ambient pressure. The wastegate is already fully closed at that point and cannot extract more boost.