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CAAB AME B1.1 Exam study materials
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CAAB AME B1.1 Exam practice questions

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Question 1Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In an aircraft electrical system, which quantity is measured by an ammeter?

  1. Resistance of a conductor
  2. Stored charge in a capacitor
  3. Potential difference between two points
  4. Electrical current flowing in a circuit Correct answer.

Explanation

An ammeter is connected in series with the circuit so that the current passes through it, and it displays the rate of charge flow in amperes. The potential difference is measured by a voltmeter connected in parallel, while resistance is determined by an ohmmeter with the circuit de-energised.

Question 2Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which material is most commonly used for the structural skin of a modern transport aeroplane?

  1. Mild steel
  2. Aluminium alloy Correct answer.
  3. Copper
  4. Cast iron

Explanation

Aluminium alloys such as 2024 and 7075 give a high strength-to-weight ratio, good formability and adequate corrosion resistance, which makes them the standard choice for aircraft skins. Steel and copper are much denser and would impose an unacceptable weight penalty on a large airframe.

Question 3Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A torque wrench is being used to tighten a bolt to a specified value. Which statement describes the correct handling of the tool?

  1. Apply load smoothly and steadily to the specified figure Correct answer.
  2. Extend the handle with a pipe to gain leverage
  3. Use it as a breaker bar to loosen seized fasteners
  4. Store it with the spring fully compressed

Explanation

A torque wrench should be loaded gradually and steadily up to the specified figure so that the break-over or indicating mechanism gives a true reading. Loosening, extending the handle or storing under load all damage the calibration and can lead to over-torqued or under-torqued fasteners.

Question 4Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which document normally authorises an engineer to carry out work on a specific aircraft and certifies that it has been completed?

  1. The maintenance record entry signed by the certifying staff Correct answer.
  2. The component maintenance manual
  3. The aircraft flight manual
  4. The weight and balance schedule

Explanation

The maintenance record entry, signed by appropriately approved certifying staff, is the legal statement that the work has been performed and released. Manuals and schedules provide instructions and data, but they do not themselves certify that the task was accomplished.

Question 5Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which of the following is a primary flight control?

  1. Spoiler
  2. Elevator Correct answer.
  3. Trim tab
  4. Flap

Explanation

Primary flight controls are those needed for the immediate control of the aircraft in pitch, roll and yaw, namely the elevator, ailerons and rudder. Flaps, spoilers and trim tabs are secondary or auxiliary controls that modify the aerodynamic characteristics rather than providing direct manoeuvring control.

Question 6Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which type of corrosion appears as a white powdery deposit on a magnesium component?

  1. Stress corrosion cracking
  2. Surface oxidation of the magnesium Correct answer.
  3. Intergranular attack
  4. Galvanic corrosion of steel

Explanation

Magnesium corrodes readily in moist air to give a white, powdery hydroxide product on the surface. Intergranular attack and stress corrosion cracking occur within the metal and are not identified by a white surface deposit, while galvanic corrosion of steel would produce red-brown rust.

Question 7Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a gas turbine engine, what is the function of the compressor?

  1. To raise the pressure of the air before combustion Correct answer.
  2. To reduce the velocity of the exhaust
  3. To ignite the fuel-air mixture
  4. To extract energy from the exhaust gas

Explanation

The compressor takes in air and raises its pressure so that a large mass of air can be burned with fuel in a small volume, producing high-energy gas. Energy extraction is the job of the turbine, ignition is performed by the igniter plugs, and exhaust velocity is influenced by the exhaust nozzle.

Question 8Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which unit is used to express the pressure of a hydraulic system in SI terms?

  1. Kilogram
  2. Litre per minute
  3. Newton metre
  4. Pascal Correct answer.

Explanation

Pressure is force per unit area, and the SI derived unit is the pascal, equal to one newton per square metre. The newton metre measures torque, the kilogram measures mass, and the litre per minute measures volumetric flow rate.

Question 9Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A cable in a flying control system is found to have a broken wire within a strand. What is the general rule for assessing such damage?

  1. Compare the number of broken wires with the limits in the approved maintenance data Correct answer.
  2. Lubricate the cable and return it to service without further check
  3. Replace the cable only if it is completely severed
  4. Ignore local strand breaks if the cable still moves freely

Explanation

Cable condition is judged against published limits for broken wires per strand and per cable length, because localised breaks reduce strength and can snag on pulleys. Only the approved maintenance data gives the acceptance criteria, and any decision must be recorded.

Question 10Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Why is a bonding jumper fitted between an aircraft structure and a component such as a fuel tank filler cap?

  1. To carry the full generator output current
  2. To provide radio frequency shielding for the cabin
  3. To act as a structural load path
  4. To provide a low-resistance path that prevents static potential differences Correct answer.

Explanation

Bonding ensures that all conducting parts are at the same electrical potential, so that static charges and fault currents cannot create a spark across a gap. The jumper is sized for bonding currents only and is not a primary power or structural connection.

Question 11Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A riveted joint in an aluminium alloy structure is to be inspected for fatigue. Where should particular attention be directed?

  1. At the areas furthest from any fastener
  2. At holes and cut-outs where stress concentrations occur Correct answer.
  3. At the painted outer surface of the skin only
  4. At the centre of large flat unstressed panels

Explanation

Fatigue cracks initiate where the local stress is raised, particularly at fastener holes, cut-outs and changes of section. Flat unstressed regions and areas remote from fasteners experience lower stress concentration and are therefore less likely to initiate cracking.

Question 12Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a hydraulic system, what is the purpose of an accumulator?

  1. To filter contamination from the fluid
  2. To store pressurised fluid and damp pressure fluctuations Correct answer.
  3. To cool the fluid returning to the reservoir
  4. To measure the flow rate to each actuator

Explanation

An accumulator contains a gas charge separated from the hydraulic fluid, so it can absorb pump pulsations, supply peak demands and maintain pressure when the pump is unloaded. Filtration, cooling and flow measurement are performed by separate components in the system.

Question 13Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

During a pitot-static system leak test, the static port is capped and pressure is applied. Why must the test pressure be applied and released slowly?

  1. To avoid damaging instruments sensitive to rapid pressure changes Correct answer.
  2. To prevent the aircraft from becoming airborne
  3. To stop the altimeter from over-reading permanently
  4. To keep the test set calibrated

Explanation

Air data instruments such as the altimeter and airspeed indicator contain sensitive capsules and linkages that can be distorted or damaged by sudden pressure changes. Gradual application and release keeps the applied differential within the instrument's design limits throughout the test.

Question 14Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which inspection method is best suited to detecting surface-breaking cracks in a non-magnetic aluminium alloy component?

  1. Ultrasonic thickness measurement
  2. Dye penetrant inspection Correct answer.
  3. Magnetic particle inspection
  4. Eddy current testing of ferrous parts only

Explanation

Dye penetrant relies on capillary action to draw a visible dye out of surface-breaking discontinuities and works on any non-porous material, including aluminium. Magnetic particle inspection requires a ferromagnetic material, and thickness measurement does not reveal cracks.

Question 15Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

An aircraft battery is being charged in the hangar. Which precaution is essential?

  1. Charge at the highest available current to save time
  2. Ensure adequate ventilation to disperse hydrogen gas Correct answer.
  3. Seal the battery in a closed container to keep it clean
  4. Disconnect the ventilation and check for sparks

Explanation

Lead-acid and nickel-cadmium batteries release hydrogen during charging, and an accumulation of hydrogen in a confined space creates an explosion risk. Good ventilation and the elimination of ignition sources are therefore mandatory during charging operations.

Question 16Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

What is the effect of increasing the bypass ratio of a turbofan engine on propulsive efficiency at typical cruise speeds?

  1. Propulsive efficiency generally improves Correct answer.
  2. Thrust per unit frontal area always increases
  3. Propulsive efficiency falls sharply
  4. Specific fuel consumption always increases

Explanation

A larger bypass ratio accelerates a greater mass of air to a lower velocity, which reduces the wasted kinetic energy in the jet and raises propulsive efficiency at subsonic cruise. It does not follow that thrust per unit frontal area rises, since the larger fan increases the frontal area.

Question 17Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A component is classified as time-expired. What does this mean for its continued use?

  1. It must be inspected every flight until it fails
  2. It must be removed from service when the specified life is reached Correct answer.
  3. It may be reset by a simple visual check
  4. It may remain in service if it still functions correctly

Explanation

A time-expired item has a declared life limit, after which continued use is not permitted regardless of apparent serviceability. The limit is a mandatory airworthiness requirement, and only an approved life extension or replacement restores eligibility.

Question 18Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Why are aircraft fasteners frequently installed with a specified grip length and washer arrangement?

  1. To ensure the shank, not the threads, bears the shear load in the joint Correct answer.
  2. To allow the nut to be tightened by hand
  3. To increase the overall weight of the joint
  4. To permit reuse of self-locking nuts

Explanation

Correct grip length places the thread run-out outside the shear plane so that the plain shank carries the load, which is stronger and less prone to fatigue. An over-long or short grip leaves threads in the joint, reducing strength and allowing movement.

Question 19Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a direct current generator system, what is the role of the voltage regulator?

  1. To disconnect the battery during engine start
  2. To limit the current carried by the bus bar
  3. To convert alternating current to direct current
  4. To control the field current so that output voltage stays within limits Correct answer.

Explanation

The voltage regulator varies the field current of the generator, which in turn controls the generated voltage as load and speed change. Rectification, battery switching and bus current limitation are performed by other components of the system.

Question 20Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

An engineer finds that a replacement part is listed in the illustrated parts catalogue but is not approved for the particular aircraft serial number. What is the appropriate action?

  1. Do not fit it until approval for that serial number is confirmed Correct answer.
  2. Fit it if it physically matches the old part
  3. Fit it because it appears in the parts catalogue
  4. Fit it and record the deviation in the log

Explanation

Applicability is determined by the approved data for the specific aircraft, and a part must be approved for that model and serial number before installation. Physical resemblance or a catalogue listing alone does not establish airworthiness approval for the installation.

Question 21Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A composite laminate panel shows a faint impact mark. Which inspection technique is most appropriate for detecting internal delamination beneath the surface?

  1. Dye penetrant inspection
  2. Magnetic particle inspection
  3. Spark testing
  4. Tap testing supplemented by ultrasonic inspection Correct answer.

Explanation

Delamination in a composite lies below the surface, so a coin-tap test is used to detect changes in sound, backed up by ultrasonic scanning for confirmation and sizing. Magnetic particle and dye penetrant methods depend on ferromagnetism or surface-breaking defects and are unsuitable for internal composite damage.

Question 22Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a multi-engine piston installation, why is a magneto check performed during the engine run-up?

  1. To verify the fuel flow at full power
  2. To set the ignition timing to the correct advance
  3. To measure the compression of each cylinder
  4. To confirm that each magneto circuit produces acceptable performance and the drop is within limits Correct answer.

Explanation

Switching from both magnetos to each one in turn shows whether either circuit is faulty, since an excessive or uneven drop indicates a problem in that ignition circuit. Timing adjustment, compression testing and fuel flow checks are separate procedures carried out with dedicated equipment.

Question 23Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A hydraulic system uses a mineral-based fluid, and a top-up is required. Which statement reflects the correct practice?

  1. Use only the fluid specified in the approved data for that system Correct answer.
  2. Use any hydraulic fluid available in the store
  3. Substitute a phosphate-ester fluid if mineral fluid is unavailable
  4. Mix fluids to achieve the required viscosity

Explanation

Hydraulic fluids differ in chemical base and are not interchangeable, since mixing can cause seal swelling, loss of lubricity or contamination. Only the fluid identified in the approved maintenance data may be used, and any substitution requires approved authorisation.

Question 24Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

During a bonding resistance check, a measured resistance is significantly higher than the specified limit. What is the most likely consequence if the aircraft is released?

  1. A reduction in the aircraft's empty weight
  2. Improved protection of the structure against lightning
  3. A higher generator output voltage
  4. An increased risk of arcing and static discharge at the affected joint Correct answer.

Explanation

A high-resistance bond fails to equalise potential between parts, so static charges or fault currents can produce a spark across the joint. This increases the risk of ignition of fuel vapour and of damage from lightning current, which is why bonding limits are mandatory.

Question 25Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A turbine engine is found to have a slightly reduced exhaust gas temperature margin at take-off power. Which interpretation is most appropriate before release?

  1. Release the aircraft because the engine still produces thrust
  2. Reduce the take-off power setting to hide the problem
  3. Reset the indication by adjusting the EGT probe position
  4. Investigate against the approved limits, since a reduced margin may indicate deterioration Correct answer.

Explanation

Exhaust gas temperature margin is a measure of how close the engine runs to its limit and reflects deterioration such as fouling or hot-section wear. A reduced margin must be assessed against the approved data, and releasing the aircraft without investigation could allow the limit to be exceeded in service.

Question 26Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which document is used to determine the scheduled maintenance tasks and their intervals for a specific aircraft type?

  1. The aircraft flight manual performance section
  2. The maintenance planning document issued by the type certificate holder Correct answer.
  3. The hangar tool calibration register
  4. The component manufacturer's sales brochure

Explanation

Scheduled maintenance tasks and their intervals are defined in the maintenance planning document (or maintenance review board report) derived from the type design and approved by the authority. Operators use it to build their own approved maintenance programme. It is the controlling reference for interval planning.

Question 27Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a four-stroke piston engine, during which stroke is the intake valve open and the piston moving toward bottom dead centre?

  1. The intake stroke Correct answer.
  2. The power stroke
  3. The exhaust stroke
  4. The compression stroke

Explanation

The intake stroke draws the fuel-air charge into the cylinder as the piston descends from top dead centre to bottom dead centre with the inlet valve open. Compression, power and exhaust follow in sequence. Valve timing is set so the inlet closes after bottom dead centre to improve filling.

Question 28Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

What is the primary purpose of a shear pin in an aircraft assembly?

  1. To resist tension loads along the bolt axis
  2. To provide a calibrated torque reference
  3. To fail at a predetermined load and protect other structure Correct answer.
  4. To lock a nut against rotation

Explanation

A shear pin is designed to transmit load in shear and to fail at a defined value, sacrificing itself to protect more costly or safety-critical structure. Its material and diameter are chosen so failure occurs before damage elsewhere. It must never be replaced by a stronger ordinary bolt.

Question 29Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which property of a lubricating oil describes its resistance to flow at a given temperature?

  1. Flash point
  2. Viscosity Correct answer.
  3. Pour point
  4. Neutralisation number

Explanation

Viscosity expresses internal fluid friction and therefore resistance to flow; it changes strongly with temperature, which is why multigrade oils are specified. It governs film thickness and load-carrying ability in bearings. The other listed values describe safety, cold-flow and chemical condition respectively.

Question 30Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In an aircraft electrical circuit, what is the function of a circuit breaker compared with a fuse?

  1. It can be reset after tripping, whereas a fuse must be replaced Correct answer.
  2. It protects only against overvoltage
  3. It limits current to a fixed value regardless of load
  4. It provides reverse-polarity protection

Explanation

Both devices protect wiring against overcurrent, but a circuit breaker is a resettable thermal or magnetic device while a fuse element melts and is renewed. The breaker must not be reset until the cause has been investigated. Fuses are used where resetting in flight is not required.

Question 31Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which material characteristic makes a component suitable for a forging process?

  1. Very low thermal conductivity
  2. High brittleness at working temperature
  3. Good ductility at the forging temperature Correct answer.
  4. High electrical resistance

Explanation

Forging relies on plastic deformation, so the material must be ductile at the working temperature to flow into the die without cracking. Forging aligns grain flow with the component shape, improving strength. Brittle materials would fracture rather than deform.

Question 32Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which unit expresses the rotational speed of a gas turbine engine spool in the SI system?

  1. Degrees per second
  2. Revolutions per minute
  3. Radians per second Correct answer.
  4. Cycles per hour

Explanation

The SI unit of angular velocity is radians per second. Revolutions per minute is widely used in practice but is not the SI unit. Conversion requires multiplying by two pi and dividing by sixty.

Question 33Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Why is a torque wrench calibrated at defined intervals?

  1. To convert the wrench between different thread standards
  2. To keep the wrench within the accuracy required for the specified tightening torque Correct answer.
  3. To increase the maximum torque the wrench can apply
  4. To reduce the wear on the socket drive

Explanation

A torque wrench is a measuring instrument, and its indicated value drifts with use and storage. Periodic calibration against a traceable standard confirms it remains within the permitted accuracy so that joints are tightened correctly. An out-of-calibration wrench invalidates the work it performed.

Question 34Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A hydraulic hose is to be installed between two components that move relative to each other. Which practice is correct?

  1. Allow sufficient slack for movement and observe the minimum bend radius Correct answer.
  2. Clamp the hose rigidly at both ends to prevent whip
  3. Route the hose so it touches a hot exhaust duct for support
  4. Twist the hose to shorten its effective length

Explanation

A flexible hose must accommodate relative movement and pressure-induced length change, so slack and correct routing are required. The specified minimum bend radius must be respected to avoid kinking and internal damage. Contact with hot surfaces and torsional preload are both prohibited.

Question 35Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

An aircraft is found to have a crack in a primary structural element. Under a damage-tolerant philosophy, what is the immediate consequence?

  1. The element may be reinforced with adhesive tape for one flight
  2. The aircraft must be assessed against the approved structural repair or disposition data before further flight Correct answer.
  3. The crack may be ignored if it is shorter than the paint film thickness
  4. The crack should be stop-drilled by any engineer and flight continued

Explanation

Damage tolerance requires that any crack in a principal structural element is evaluated against approved data, which defines allowable damage limits and inspection or repair action. Flight without an approved disposition is not permitted. Unauthorised repairs remove the basis of certification.

Question 36Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

An avionics line-replaceable unit is to be removed. Which precaution protects the unit from electrostatic discharge damage?

  1. Store the unit on a dry foam mat without packaging
  2. Wear cotton gloves and handle the connector pins freely
  3. Wrap the unit in dry newspaper for transport
  4. Use a grounded wrist strap and place the unit in a conductive bag Correct answer.

Explanation

Electrostatic-sensitive devices must be handled with a grounded wrist strap and bonded work surface so that charge equalises before contact with pins. The unit is then carried in conductive or dissipative packaging. This prevents a discharge through the internal circuitry.

Question 37Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A pitot head heater is found to draw no current when switched on. Which initial check is most appropriate?

  1. Replace the pitot head immediately
  2. Recalibrate the airspeed indicator
  3. Increase the circuit breaker rating
  4. Check the supply at the heater terminals and the heater element resistance Correct answer.

Explanation

Fault-finding should proceed logically from supply to load: confirm voltage reaches the heater and measure element resistance against the specified value. This distinguishes a wiring fault from a failed element. Parts are replaced only once the fault is confirmed.

Question 38Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

During a compression check on a piston engine cylinder, one cylinder reads noticeably low but improves when oil is added to the bore. What does this indicate?

  1. Worn piston rings or cylinder bore Correct answer.
  2. A blocked fuel injector nozzle
  3. An incorrectly timed magneto
  4. A defective exhaust valve seat

Explanation

Oil temporarily seals the gap between rings and bore, so compression rises when the leakage path is past the piston rings. Valve leakage is not sealed by oil in the bore and would persist. The result therefore points to ring or bore wear.

Question 39Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Aircraft wheels are fitted with fusible plugs. What is their function?

  1. To indicate the tyre wear limit
  2. To release tyre pressure if the wheel overheats Correct answer.
  3. To lock the wheel bearing nut
  4. To balance the wheel assembly

Explanation

A fusible plug contains a low-melting alloy that melts at a defined temperature, allowing tyre pressure to escape before heat causes the tyre to burst. This is a fire and thermal safety feature. The plug is not a wear, balance or locking device.

Question 40Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

What is the purpose of the inlet guide vanes at the front of an axial compressor?

  1. To direct air onto the first stage rotor at the correct angle Correct answer.
  2. To increase the fuel flow to the combustor
  3. To cool the turbine blades
  4. To support the exhaust cone

Explanation

Inlet guide vanes turn the incoming air so that it meets the first rotor stage at the designed angle, improving efficiency and helping to avoid surge at low speeds. Some installations have variable vanes for that reason. They do not meter fuel or cool turbine blades.

Question 41Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

An aircraft is to be jacked for a landing gear retraction test. Which control measure is essential before the aircraft is raised?

  1. Fit safety locks or stands and confirm the centre of gravity is within limits Correct answer.
  2. Deflate all tyres to reduce load
  3. Remove the aircraft batteries to save weight
  4. Disconnect all hydraulic lines to the gear

Explanation

Jacking requires that the aircraft is stable, that the centre of gravity lies within the approved jacking limits and that safety stands or locks are placed as soon as it is raised. This prevents tipping or jack collapse. Hydraulic and electrical services are configured as the task requires, not indiscriminately removed.

Question 42Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A component is to be refitted using a specified locking device. Which statement reflects correct practice for a castellated nut and split pin?

  1. The split pin may be replaced by a piece of locking wire of similar diameter
  2. The nut is tightened until the pin hole aligns, and the pin is fitted with the head on top or forward Correct answer.
  3. The pin is fitted with its legs cut flush to the nut face
  4. The nut is left finger tight to allow the pin to be inserted easily

Explanation

The nut is torqued to the specified value and the nearest castellation aligned by tightening, never by slackening, then a new split pin is fitted with its head oriented as required. The pin legs are spread and trimmed to the specified length. Improvised locking is not acceptable.

Question 43Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

Which inspection technique is appropriate for detecting a crack on the inner surface of a ferrous component that is accessible only through a small bore?

  1. Borescope visual examination with illumination Correct answer.
  2. Dye penetrant applied to the exterior
  3. Eddy current scanning of the outer skin
  4. Magnetic particle inspection of the outer surface

Explanation

A borescope or videoscope allows direct illuminated visual examination of internal surfaces reached through small openings. It is the standard first-line method for internal inspection of engine and structural cavities. Surface methods applied externally cannot reveal an internal crack.

Question 44Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A nickel-cadmium battery shows a persistent low cell voltage after charging. Which condition is most consistent with this finding?

  1. A correctly serviceable battery at full charge
  2. An overfilled electrolyte level
  3. A loose battery tray retaining bolt
  4. Cell imbalance caused by prolonged low-rate overcharging Correct answer.

Explanation

Prolonged low-rate overcharge causes the formation of large crystals and voltage depression in nickel-cadmium cells, so the battery appears to lose capacity and one cell may read low. Capacity restoration or cell replacement may be required. Electrolyte level and tray security do not explain a persistent low cell voltage.

Question 45Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A turbine engine is being assessed for hot-section deterioration. Which combination of indications best supports that conclusion?

  1. Constant exhaust gas temperature with rising oil pressure
  2. Rising exhaust gas temperature at constant thrust and increasing fuel flow Correct answer.
  3. Reduced oil consumption with unchanged gas path parameters
  4. Falling exhaust gas temperature and falling fuel flow

Explanation

Deterioration of compressor efficiency or turbine condition reduces the work available, so more fuel is burned to hold thrust and exhaust gas temperature rises. Trending these parameters against baseline is the standard method of monitoring hot-section health. Isolated oil system changes are not diagnostic of gas-path deterioration.

Question 46Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

During a flight control rigging check, the control surface reaches full travel before the cockpit control reaches its stop. What is the correct interpretation?

  1. The discrepancy can be ignored if the aircraft is not pressurised
  2. The surface travel should be reduced by shortening the pushrod further
  3. The system is correctly rigged because the surface moves fully
  4. The control travel is restricted, and the rigging must be adjusted so that stops are reached in the approved sequence Correct answer.

Explanation

Approved rigging data defines which stop limits travel and the order in which the control and surface stops are reached, so that the structure is not loaded by the controls. If the surface reaches its stop first, the linkage is misrigged and must be adjusted. Full surface travel alone does not demonstrate correct rigging.

Question 47Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A composite sandwich panel with a honeycomb core is suspected of internal water ingress after long exposure. Which inspection method is best suited to mapping the affected area?

  1. Magnetic particle inspection of the core
  2. Dye penetrant inspection of the outer skin
  3. Tap testing supplemented by through-transmission ultrasonic scanning Correct answer.
  4. Eddy current inspection of the honeycomb core

Explanation

Water in a honeycomb core changes the local stiffness and acoustic response, so tap testing gives a rapid indication while through-transmission ultrasound maps the extent of the ingress. The core is non-metallic, so magnetic and eddy current methods do not apply. Penetrant reveals only surface-breaking defects.

Question 48Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

A hydraulic system pressure gauge reads normal but an actuator moves sluggishly under load. Which fault is most consistent with these symptoms?

  1. A partially blocked return filter causing high back pressure Correct answer.
  2. A failed gauge indicating zero pressure
  3. An empty reservoir
  4. A completely seized actuator piston

Explanation

If supply pressure is normal but the actuator is slow under load, the restriction is likely downstream, such as a clogged return filter or flow-control valve causing back pressure and reduced effective pressure differential. A seized actuator or empty reservoir would give different indications.

Question 49Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

What is the function of a swaged terminal on an aircraft control cable?

  1. To terminate the cable end and transmit load through a secure mechanical joint Correct answer.
  2. To allow the cable to pass around a pulley without wear
  3. To insulate the cable electrically
  4. To provide an adjustable length for rigging

Explanation

A swaged terminal is formed by pressing a fitting onto the cable so that the strands grip inside the barrel, transmitting the cable load to the end fitting. The swage is inspected for dimensions and defects. Adjustability is provided by turnbuckles, and pulley guidance by fairleads.

Question 50Aircraft Maintenance Engineering (B1.1) - module content not enumerated in source

In a fire detection system using a continuous sensing element, why is the loop arranged so that a single break does not disable detection?

  1. To maintain detection capability after a single fault, in line with fail-safe design Correct answer.
  2. To allow the loop to be used as a bonding path
  3. To reduce the weight of the sensing element
  4. To increase the operating temperature of the detector

Explanation

Fire detection must remain functional after a single failure, so the loop is configured so that a break still permits alarm signalling or is itself annunciated as a fault. This fail-safe philosophy ensures the crew is never left without fire warning. Weight and temperature are not the governing reasons.