I85PREP
⌘ K
Canadian Recreational Pilot Permit Aeroplane RPPAE foundations study materials
Canadian Recreational Pilot Permit Aeroplane RPPAE foundations study resources

Canadian Recreational Pilot Permit Aeroplane RPPAE foundations practice questions

One question at a time. Build your Canadian Recreational Pilot Permit Aeroplane RPPAE foundations understanding.

First 50 of 190 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Canadian rule scope and operating decisions

What is the maximum passenger carrying privilege permitted under a Canadian Recreational Pilot Permit (Aeroplane)?

  1. No passengers are permitted
  2. A maximum of one passenger Correct answer.
  3. A maximum of three passengers
  4. Up to nine passengers, depending on aircraft seating capacity

Explanation

According to Canadian Aviation Regulations (CARs) section 401.22, the holder of a Recreational Pilot Permit (Aeroplane) may, under day VFR, act as pilot-in-command of a single-engine, non-high-performance aeroplane designed for a maximum of four persons, but may carry only one passenger.

Question 2Navigation, time and fuel

On a VFR Navigation Chart (VNC), what type of projection is used?

  1. Mercator projection
  2. Lambert Conformal Conic projection Correct answer.
  3. Transverse Mercator projection
  4. Polar Stereographic projection

Explanation

VNCs (scale 1:500,000) are constructed using the Lambert Conformal Conic projection. On this projection, a straight line represents a great circle (the shortest distance between two points) and angles are preserved.

Question 3Navigation, time and fuel

How many minutes of latitude are there in one degree, and what distance does one minute of latitude represent?

  1. 60 minutes; 1 statute mile
  2. 60 minutes; 1 nautical mile Correct answer.
  3. 100 minutes; 1 nautical mile
  4. 60 minutes; 1 kilometer

Explanation

Every degree of latitude is divided into 60 minutes. Because of the Earth's circumference, one minute of latitude is equal to exactly one nautical mile (approx. 6,076 feet or 1,852 meters). This is a convenient scale used by pilots to measure distances.

Question 4Navigation, time and fuel

If your True Heading (TH) is 085 degrees and the magnetic variation is 15 degrees West, what is your Magnetic Heading (MH)?

  1. 070 degrees
  2. 100 degrees Correct answer.
  3. 085 degrees
  4. 015 degrees

Explanation

The formula to convert True to Magnetic is: Magnetic Heading = True Heading +/- Variation. The mnemonic 'West is Best, East is Least' means you add West variation (+15) and subtract East variation. So, 085 + 15 = 100 degrees.

Question 5Navigation, time and fuel

If an aircraft cruises at a groundspeed of 120 knots, how long will it take to fly a distance of 180 nautical miles?

  1. 1 hour and 15 minutes
  2. 1 hour and 30 minutes Correct answer.
  3. 1 hour and 45 minutes
  4. 2 hours

Explanation

Time = Distance / Groundspeed. Time = 180 NM / 120 knots = 1.5 hours. Converting 0.5 hours to minutes (0.5 * 60) gives 30 minutes, so the total time is 1 hour and 30 minutes.

Question 6Navigation, time and fuel

An engine burns 8.5 gallons of fuel per hour. If a flight takes 2 hours and 24 minutes, how much fuel is consumed?

  1. 17.0 gallons
  2. 19.2 gallons
  3. 20.4 gallons Correct answer.
  4. 22.1 gallons

Explanation

First, convert 2 hours and 24 minutes to decimal hours: 24 minutes / 60 minutes = 0.4 hours. Total time is 2.4 hours. Fuel consumed = Time * Burn rate = 2.4 hours * 8.5 gal/hr = 20.4 gallons.

Question 7Navigation, time and fuel

How does True Airspeed (TAS) compare to Indicated Airspeed (IAS) as altitude increases, assuming a constant IAS?

  1. TAS decreases as altitude increases
  2. TAS increases as altitude increases Correct answer.
  3. TAS remains identical to IAS at all altitudes
  4. TAS increases up to 5,000 feet, then decreases

Explanation

Because air density decreases with altitude, an airspeed indicator (which measures dynamic pressure) requires a faster actual speed through the air to read the same indicated speed. As a rule of thumb, TAS increases by roughly 2% per 1,000 feet of altitude above IAS.

Question 8Navigation, time and fuel

What is the definition of Density Altitude?

  1. The altitude read directly from the altimeter when set to the local pressure
  2. The altitude above the surface of the earth
  3. Pressure altitude corrected for non-standard temperature Correct answer.
  4. The altitude above mean sea level

Explanation

Density altitude is defined as pressure altitude corrected for non-standard temperature. In hot conditions, air is less dense, which increases the density altitude. High density altitude degrades aircraft performance (less lift, less thrust).

Question 9Navigation, time and fuel

Which lines on an aeronautical chart connect points of equal magnetic variation?

  1. Agonic lines
  2. Isogonic lines Correct answer.
  3. Contour lines
  4. Parallels of latitude

Explanation

Isogonic lines are dashed magenta lines on VFR charts that connect points of equal magnetic variation. Variation is the angle between True North and Magnetic North.

Question 10Navigation, time and fuel

A VOR indicator shows a centered CDI with a 'FROM' flag and the OBS selected to 270 degrees. Where is the aircraft located relative to the VOR station?

  1. Directly West of the station Correct answer.
  2. Directly East of the station
  3. Directly North of the station
  4. Directly South of the station

Explanation

With the OBS set to 270 degrees and a FROM flag, the aircraft is on the 270-degree radial (which points directly West from the VOR station). Since the CDI is centered, the aircraft is located directly West of the VOR.

Question 11Navigation, time and fuel

An ADF indicator displays a Relative Bearing (RB) of 090 degrees. If the aircraft's Magnetic Heading (MH) is 045 degrees, what is the Magnetic Bearing TO (MB TO) the NDB station?

  1. 045 degrees
  2. 090 degrees
  3. 135 degrees Correct answer.
  4. 225 degrees

Explanation

The formula to find the Magnetic Bearing to the station (MB TO) is: MB TO = MH + RB. In this case, MH (045) + RB (090) = 135 degrees. If the sum is greater than 360, subtract 360.

Question 12Navigation, time and fuel

What is the meaning of the abbreviation 'VTA' on aeronautical charts?

  1. VFR Terminal Area Chart Correct answer.
  2. VHF Transmitted Altitude
  3. Visual Terrain Association
  4. VFR Transition Airspace

Explanation

VTA stands for VFR Terminal Area Chart. These charts are printed at a larger scale (1:250,000) than VNCs (1:500,000) to show more detail in busy, complex airspace around major terminal areas.

Question 13Navigation, time and fuel

When converting US Gallons to Liters, what is the correct conversion factor?

  1. 1 US Gallon = 3.785 Liters Correct answer.
  2. 1 US Gallon = 4.546 Liters
  3. 1 US Gallon = 1.201 Liters
  4. 1 US Gallon = 2.205 Liters

Explanation

One US gallon is equal to approximately 3.785 liters. Pilots must be careful to distinguish between US gallons (used in many aircraft manuals) and Imperial gallons (used historically in Canada) which are equal to 4.546 liters.

Question 14Navigation, time and fuel

An aircraft is flying at a True Heading of 360 degrees. The wind is from 270 degrees. In which direction will the aircraft drift?

  1. To the left (West)
  2. To the right (East) Correct answer.
  3. The aircraft will not drift
  4. The aircraft will decelerate but not drift

Explanation

If the aircraft is heading North (360) and the wind is coming from the West (270), the wind is a direct left crosswind. This wind blows the aircraft to the right (East) of its intended track. To compensate, the pilot must turn the nose slightly to the left.

Question 15Navigation, time and fuel

If you are flying on a True Track of 090 degrees and have calculated a wind correction angle of 8 degrees to the right (to compensate for drift), what is your True Heading?

  1. 082 degrees
  2. 090 degrees
  3. 098 degrees Correct answer.
  4. 108 degrees

Explanation

True Heading = True Track + Wind Correction Angle. A correction 'to the right' means we add the angle (+8) to our track: 090 + 8 = 098 degrees True Heading. This crabs the aircraft into the wind to keep it on track.

Question 16Navigation, time and fuel

In the Canada Flight Supplement (CFS), what does the abbreviation 'COMM' indicate in an aerodrome sketch or entry?

  1. Commercial flight operations restrictions
  2. Communications frequencies and services available at the aerodrome Correct answer.
  3. Community aerodrome operating committee details
  4. Compass rose alignment check procedures

Explanation

In the CFS, the 'COMM' section lists all radio communication frequencies and services available at that aerodrome, such as tower, ground, ATIS, UNICOM, MF, or ATF frequencies.

Question 17Navigation, time and fuel

VHF radio transmissions propagate primarily through what method, and how does this affect reception range?

  1. Ground waves; range is unaffected by altitude
  2. Sky waves; transmissions reflect off the ionosphere and reach thousands of miles
  3. Line-of-sight; range increases as the aircraft's altitude increases Correct answer.
  4. Surface waves; range is limited to 10 nautical miles regardless of altitude

Explanation

VHF (Very High Frequency) signals propagate via line-of-sight. Therefore, terrain or the curvature of the Earth will block the signals. As an aircraft climbs higher, the line-of-sight horizon expands, increasing the reception range.

Question 18Navigation, time and fuel

What is the standard VHF emergency frequency monitored by ATC and search and rescue services?

  1. 121.5 MHz Correct answer.
  2. 122.8 MHz
  3. 123.2 MHz
  4. 126.7 MHz

Explanation

121.5 MHz is the international VHF emergency and distress frequency. It is monitored by towers, FSS stations, military aircraft, and commercial flights to listen for emergency locator transmitter (ELT) signals or distress calls.

Question 19Navigation, time and fuel

How do you convert local Eastern Standard Time (EST) to Coordinated Universal Time (UTC)?

  1. Add 4 hours
  2. Add 5 hours Correct answer.
  3. Subtract 5 hours
  4. Add 8 hours

Explanation

To convert local Eastern Standard Time (EST) to Coordinated Universal Time (UTC/Zulu), you must add 5 hours. (For Eastern Daylight Time - EDT, you add 4 hours).

Question 20Navigation, time and fuel

A NOTAM contains the expression 'TIL APR 15 1800Z'. What is the meaning of this statement?

  1. The NOTAM is valid beginning on April 15 at 1800 UTC
  2. The NOTAM is valid until April 15 at 1800 UTC Correct answer.
  3. The NOTAM was cancelled on April 15 at 1800 UTC
  4. The NOTAM is advisory only and expires in 18 days

Explanation

'TIL' stands for 'Until'. Therefore, 'TIL APR 15 1800Z' indicates that the NOTAM conditions remain in effect until April 15 at 1800 UTC (Zulu time), at which point the NOTAM expires.

Question 21Weather mechanisms and information

What is the standard sea level temperature and pressure under the International Standard Atmosphere (ISA)?

  1. 15°C and 1013.2 hPa (29.92 in Hg) Correct answer.
  2. 0°C and 1013.2 hPa (29.92 in Hg)
  3. 15°C and 1000.0 hPa (29.50 in Hg)
  4. 20°C and 1013.2 hPa (29.92 in Hg)

Explanation

Under ISA standards, the reference values for sea level are a temperature of 15°C (59°F) and a barometric pressure of 1013.25 hectopascals or millibars (equivalent to 29.92 inches of mercury).

Question 22Weather mechanisms and information

What is the standard temperature lapse rate in the troposphere?

  1. 1.98°C per 1,000 feet of altitude Correct answer.
  2. 3.5°C per 1,000 feet of altitude
  3. 1.0°C per 1,000 feet of altitude
  4. 2.5°C per 1,000 feet of altitude

Explanation

The standard temperature lapse rate in the troposphere is 1.98°C (commonly rounded to 2°C) per 1,000 feet. This represents the rate at which temperature decreases with altitude in a standard atmosphere.

Question 23Weather mechanisms and information

Which layer of the atmosphere contains almost all civil aviation flight operations and weather activity?

  1. Stratosphere
  2. Troposphere Correct answer.
  3. Mesosphere
  4. Thermosphere

Explanation

The troposphere is the lowest layer of the Earth's atmosphere. It extends from the surface to about 36,000 feet (depending on latitude and season) and contains nearly all water vapor and weather activity.

Question 24Weather mechanisms and information

What characteristics are typical of an unstable air mass?

  1. Stratus clouds, steady precipitation, smooth air, and poor visibility
  2. Cumulus clouds, showery precipitation, turbulent air, and good visibility Correct answer.
  3. Clear skies, light winds, temperature inversion, and fog
  4. High relative humidity, no wind, and zero visibility

Explanation

Unstable air encourages vertical currents. This leads to the formation of cumuliform clouds, turbulent flight conditions, showery (intermittent) precipitation, and generally good visibility outside of the showers because pollutants are carried upward.

Question 25Weather mechanisms and information

What characteristics are typical of a stable air mass?

  1. Cumulus clouds, good visibility, and strong winds
  2. Stratus clouds, steady precipitation, smooth air, and poor visibility Correct answer.
  3. Severe turbulence, thunderstorms, and hail
  4. Dust storms and low-level wind shear

Explanation

Stable air resists vertical movement. If forced to rise, it spreads out horizontally, creating stratiform clouds, steady precipitation, smooth flying conditions (no convection), and traps particles near the ground, causing poor visibility.

Question 26Weather mechanisms and information

How does surface friction affect wind direction and speed in the Northern Hemisphere?

  1. Friction increases wind speed and causes the wind to veer (turn clockwise)
  2. Friction decreases wind speed and causes the wind to back (turn counter-clockwise) Correct answer.
  3. Friction has no effect on wind direction
  4. Friction causes the wind to blow directly parallel to the isobars

Explanation

Surface friction slows the wind near the ground. This reduces the Coriolis force, allowing the pressure gradient force to pull the wind inward across the isobars. In the Northern Hemisphere, this deceleration causes the wind to back (turn counter-clockwise) near the surface.

Question 27Weather mechanisms and information

What is the name of the cloud type that represents a significant hazard to aviation due to internal severe turbulence, icing, hail, and lightning?

  1. Altocumulus
  2. Cumulonimbus Correct answer.
  3. Nimbostratus
  4. Cirrus

Explanation

Cumulonimbus (CB) clouds are thunderstorm clouds. They feature massive vertical development and contain violent updrafts and downdrafts, heavy precipitation, icing, lightning, and hail, making them extremely hazardous to all aircraft.

Question 28Weather mechanisms and information

What type of icing is milky, white, and opaque, and forms when small water droplets freeze rapidly on contact with the aircraft skin?

  1. Clear ice
  2. Rime ice Correct answer.
  3. Mixed ice
  4. Hoar frost

Explanation

Rime ice is a rough, milky-white, opaque ice deposit. It forms when small water droplets (typical in stratiform clouds) freeze instantly upon hitting the cold airframe, trapping air bubbles inside the ice.

Question 29Weather mechanisms and information

What are the three essential ingredients required for the formation of a thunderstorm?

  1. High pressure, cold air, and wind shear
  2. Moisture, unstable air, and a lifting force Correct answer.
  3. Warm temperatures, clear skies, and strong surface winds
  4. Low relative humidity, dust particles, and high density altitude

Explanation

For a thunderstorm to develop, three elements must be present: moisture (to form clouds and release latent heat), an unstable atmosphere (to allow continuous vertical development), and a lifting action (like a cold front, solar heating, or mountains) to kick-start the upward air motion.

Question 30Weather mechanisms and information

Which stage of a thunderstorm is characterized by the onset of precipitation and both updrafts and downdrafts within the cloud?

  1. Cumulus stage
  2. Mature stage Correct answer.
  3. Dissipating stage
  4. Anvil stage

Explanation

The mature stage is the most violent period of a thunderstorm. It begins when rain or precipitation reaches the surface. It is characterized by the presence of both strong updrafts (which feed the storm) and downdrafts (created by falling rain cooling the air).

Question 31Weather mechanisms and information

What type of fog forms on clear, calm nights when the Earth's surface cools down and cools the air immediately above it to its dew point?

  1. Advection fog
  2. Radiation fog Correct answer.
  3. Steam fog
  4. Upslope fog

Explanation

Radiation fog forms on clear nights with light winds (usually less than 5 knots) when the ground radiates heat into space, cooling the surface. The air close to the ground is cooled by conduction to its dew point, forming fog.

Question 32Weather mechanisms and information

What type of weather is generally associated with a fast-moving cold front?

  1. Continuous steady rain for days, stratus clouds, and light wind
  2. Narrow bands of severe cumulus clouds, showery rain, sudden wind shifts, and thunderstorms Correct answer.
  3. Clear skies with no wind or weather changes
  4. High cirrus clouds followed by gradual warming with no wind shifts

Explanation

A cold front is steep and pushes under warmer air rapidly. This causes strong vertical lifting, which frequently generates cumulonimbus clouds, heavy showers, thunderstorms, and sudden shifts in wind direction (typically backing before and veering after passage).

Question 33Weather mechanisms and information

In a METAR report, how are wind direction and speed reported?

  1. Direction in degrees magnetic relative to magnetic north; speed in knots
  2. Direction in degrees true relative to true north; speed in knots Correct answer.
  3. Direction in degrees true relative to true north; speed in miles per hour
  4. Direction in degrees magnetic; speed in kilometers per hour

Explanation

In printed aviation forecasts and reports (such as METARs, TAFs, GFAs, and FDs), the wind direction is always reported in degrees true relative to True North. Wind speed is reported in knots. (Mnemonic: 'If you read it, it's True. If you hear it, it's Magnetic').

Question 34Weather mechanisms and information

Decode the following METAR wind group: '24015G25KT'

  1. Wind from 240 degrees magnetic at 15 knots, gusting to 25 knots
  2. Wind from 240 degrees true at 15 knots, gusting to 25 knots Correct answer.
  3. Wind from 240 degrees true at 25 knots, gusting to 15 knots
  4. Wind direction variable between 150 and 250 degrees at 24 knots

Explanation

'24015G25KT' indicates that the wind is blowing from 240 degrees true at a sustained speed of 15 knots, with gusts peaking at 25 knots.

Question 35Weather mechanisms and information

What is the meaning of the abbreviation 'TEMPO' in a Terminal Aerodrome Forecast (TAF)?

  1. A permanent change in weather conditions occurring at that time
  2. Temporary fluctuations in weather conditions lasting for less than one hour in each instance Correct answer.
  3. Temperature values expected during that forecast period
  4. A cold front passage is expected temporarily

Explanation

'TEMPO' indicates temporary fluctuations in the meteorological conditions that are expected to last for less than one hour in each instance, and in the aggregate cover less than half of the forecast period.

Question 36Weather mechanisms and information

In an Upper Wind and Temperature Forecast (FD) entry, what does '9900' indicate?

  1. Wind from 990 degrees at 0 knots
  2. Wind speed is 99 knots from the North
  3. Wind is light and variable, speed less than 5 knots Correct answer.
  4. The forecast is missing or unavailable

Explanation

In an FD forecast, '9900' is a code indicating that the wind is light and variable (less than 5 knots), and no temperature is listed because winds are too weak to define a clear direction.

Question 37Weather mechanisms and information

In an Upper Wind and Temperature Forecast (FD) entry, you read '2345-12' at the 6,000 foot level. Decode this forecast.

  1. Wind from 230 degrees true at 45 knots, temperature minus 12 degrees Celsius Correct answer.
  2. Wind from 230 degrees magnetic at 45 knots, temperature minus 12 degrees Celsius
  3. Wind from 23 degrees true at 45 knots, temperature plus 12 degrees Celsius
  4. Wind from 234 degrees true at 5 knots, temperature minus 12 degrees Celsius

Explanation

The first two digits (23) represent the wind direction in tens of degrees (230 degrees True). The next two digits (45) represent wind speed in knots. The last digits (-12) represent the temperature in degrees Celsius.

Question 38Weather mechanisms and information

In an Upper Wind and Temperature Forecast (FD) entry, you read the code '7512-40'. Decode this wind group.

  1. Wind from 750 degrees true at 12 knots, temperature minus 40 degrees Celsius
  2. Wind from 250 degrees true at 112 knots, temperature minus 40 degrees Celsius Correct answer.
  3. Wind from 250 degrees true at 12 knots, temperature minus 40 degrees Celsius
  4. Wind from 075 degrees true at 12 knots, temperature minus 40 degrees Celsius

Explanation

When wind speed in an FD is between 100 and 199 knots, 50 is added to the direction code (which becomes 51 to 86) and 100 is subtracted from the speed. Here, direction code is 75. Subtract 50 to get 25 (250 degrees). Speed code is 12. Add 100 to get 112 knots. Temperature is -40°C.

Question 39Weather mechanisms and information

If you fly from an area of high barometric pressure to an area of low barometric pressure without resetting your altimeter, what will the altimeter indicate?

  1. The altimeter will read lower than your actual true altitude
  2. The altimeter will read higher than your actual true altitude (indicate you are higher than you are) Correct answer.
  3. The altimeter will continue to read the correct true altitude
  4. The altimeter will fluctuate randomly between high and low values

Explanation

When flying from a high-pressure zone to a low-pressure zone, the air pressure at your altitude is lower. The altimeter interprets this lower pressure as a climb and reads higher than the actual true altitude. Mnemonic: 'High to Low, Look out Below!'

Question 40Weather mechanisms and information

What type of breeze forms during the day as a result of the land heating up faster than the adjacent water?

  1. Land breeze
  2. Sea breeze Correct answer.
  3. Katabatic wind
  4. Anabatic wind

Explanation

During the day, solar radiation heats the land faster than the water. The air over the land warms, becomes less dense, and rises. Cooler, denser air over the water moves inland to replace it, creating a 'sea breeze'.

Question 41Weather mechanisms and information

In a METAR, what does the abbreviation 'BKN' indicate regarding cloud cover?

  1. Broken cloud coverage, representing 3/8 to 4/8 of the sky covered
  2. Broken cloud coverage, representing 5/8 to 7/8 of the sky covered Correct answer.
  3. Scattered cloud coverage, representing 1/8 to 2/8 of the sky covered
  4. Overcast cloud coverage, representing 8/8 of the sky covered

Explanation

In aviation reports, cloud cover is measured in oktas (eighths of the sky). 'BKN' (Broken) indicates that 5/8 to 7/8 of the sky is covered by clouds. This constitutes a ceiling in VFR operations.

Question 42Light-aircraft systems, aerodynamics and human factors

What are the four primary forces acting on an aircraft in flight?

  1. Lift, gravity, acceleration, and friction
  2. Lift, weight, thrust, and drag Correct answer.
  3. Lift, buoyancy, momentum, and drag
  4. Updraft, weight, thrust, and friction

Explanation

The four fundamental aerodynamic forces acting on an aircraft in flight are: Lift (acting upwards, perpendicular to the flight path), Weight (acting downwards due to gravity), Thrust (acting forward, produced by the engine), and Drag (acting rearward, opposing forward motion).

Question 43Light-aircraft systems, aerodynamics and human factors

In steady, unaccelerated, level flight, what is the relationship between the four forces of flight?

  1. Lift is greater than weight, and thrust is greater than drag
  2. Lift is equal to weight, and thrust is equal to drag Correct answer.
  3. Lift is equal to drag, and thrust is equal to weight
  4. Lift is greater than drag, and thrust is less than weight

Explanation

According to Newton's laws of motion, in steady, straight, and unaccelerated level flight, the aircraft is in equilibrium. This means the upward force equals the downward force (Lift = Weight) and the forward force equals the rearward force (Thrust = Drag).

Question 44Light-aircraft systems, aerodynamics and human factors

What is the primary purpose of wing flaps on an aeroplane?

  1. To increase the cruise speed of the aircraft
  2. To increase lift and drag, allowing a steeper approach angle without increasing airspeed Correct answer.
  3. To control the yawing motion of the aircraft during crosswind landings
  4. To balance the aircraft longitudinally about the lateral axis

Explanation

Flaps are high-lift devices mounted on the trailing edge of wings. Extending them increases the wing's camber and surface area, producing more lift and significantly more drag. This allows the pilot to make a steeper descent to landing without building up excessive speed.

Question 45Light-aircraft systems, aerodynamics and human factors

What type of drag is a direct byproduct of lift generation, and how does it change with speed?

  1. Parasite drag; increases as airspeed increases
  2. Induced drag; decreases as airspeed increases Correct answer.
  3. Form drag; decreases as airspeed increases
  4. Skin friction drag; remains constant at all speeds

Explanation

Induced drag is caused by the vertical redirection of airflow around the wing tips (wingtip vortices) during lift production. At higher speeds, the angle of attack is lower to produce the same lift, which decreases the size of vortices and reduces induced drag.

Question 46Light-aircraft systems, aerodynamics and human factors

An aircraft wing stalls when it exceeds what aerodynamic limit?

  1. Maximum cruising airspeed
  2. The critical angle of attack Correct answer.
  3. Maximum structural load factor limit
  4. The maximum glide speed

Explanation

A stall is a sudden drop in lift caused by the separation of airflow from the upper surface of the wing. This occurs when the wing is operated at an angle of attack greater than the critical angle of attack, regardless of airspeed or pitch attitude.

Question 47Light-aircraft systems, aerodynamics and human factors

What is longitudinal stability, and about which axis of the aircraft does it occur?

  1. Stability about the vertical axis (yaw)
  2. Stability about the longitudinal axis (roll)
  3. Stability about the lateral axis (pitch) Correct answer.
  4. Stability during ground taxiing operations

Explanation

Longitudinal stability is the stability of the aircraft nose pitch up or down, which occurs about the lateral axis (running wingtip to wingtip). It is highly influenced by the location of the Center of Gravity relative to the center of lift.

Question 48Light-aircraft systems, aerodynamics and human factors

What is the first indication of carburetor ice in an aeroplane equipped with a fixed-pitch propeller?

  1. A sudden increase in engine oil temperature
  2. A drop in engine RPM, followed by engine roughness Correct answer.
  3. A drop in manifold pressure while RPM remains constant
  4. Immediate engine failure without warning

Explanation

In an aircraft with a fixed-pitch propeller, the loss of engine power due to restricted airflow from carburetor ice is shown by a gradual drop in engine RPM, which is followed by engine roughness if the ice is not cleared.

Question 49Light-aircraft systems, aerodynamics and human factors

What is the initial effect of applying carburetor heat when carburetor ice is present in an engine with a fixed-pitch propeller?

  1. An immediate increase in engine RPM
  2. An initial drop in RPM, followed by a rise in RPM as the ice melts Correct answer.
  3. The engine will run smoother immediately with no change in RPM
  4. The oil pressure will drop significantly

Explanation

Applying carburetor heat routes hot, less dense air into the engine. This causes an initial drop in RPM (because hot air produces less power). As the ice melts, water passes through the engine (causing temporary roughness), and then RPM rises as the airflow restriction is removed.

Question 50Light-aircraft systems, aerodynamics and human factors

Why do aviation engines utilize a dual ignition system with two independent magnetos and two spark plugs per cylinder?

  1. To allow the pilot to shut down half the engine to conserve fuel
  2. For safety and redundancy in case one magneto fails, and to provide more efficient and even combustion of the fuel mixture Correct answer.
  3. To allow high-voltage operations at night
  4. To prevent engine stalls during inverted flight maneuvers

Explanation

Dual ignition provides redundancy (if one magneto or spark plug fails, the engine continues to run on the other). It also improves performance by igniting the fuel-air mixture from two points in the cylinder, leading to faster, more complete combustion.