Part-66 Prep
Free practice

Use your browser's print dialog and choose "Save as PDF" to download.

Module 11B Piston aeroplane aerodynamics, structures and systems: 50 practice questions

Real EASA paper: Category A 72 Q / 90 min · B1.2 100 Q / 125 min. Three options, 75% to pass. Answer key on the last page. From part66exam.com · independent study aid, not an official exam or a past paper.

  1. 1. If a turbine-fuelled aircraft's fuel (Jet A) is mistakenly put in a light piston aeroplane, the result is likely to be:

    1. A. improved performance
    2. B. detonation and engine failure
    3. C. no effect on the engine

  2. 2. A tailwheel on a conventional-gear light aeroplane is usually steerable through:

    1. A. springs to the rudder, with full swivel
    2. B. a separate hydraulic steering motor
    3. C. the throttle and differential power

  3. 3. Landing lights mounted on the nose gear leg of a retractable aeroplane:

    1. A. stay lit inside the gear bay in cruise
    2. B. replace the taxi light for ground use
    3. C. retract with the gear and are only lit with gear down

  4. 4. Why is an antibalance (leading) tab used on some light aeroplanes?

    1. A. To reduce control forces on a heavy surface at high airspeed
    2. B. To prevent control-surface flutter when flying at high speed
    3. C. To increase control forces on a surface that would otherwise be too light and sensitive

  5. 5. Tie-down rings in a light aeroplane cargo area are:

    1. A. rated for a maximum load
    2. B. adjustable in strength by the loader
    3. C. decorative fittings with no rating

  6. 6. The horizontal stabiliser incidence on many light aeroplanes is:

    1. A. adjusted in flight by the pilot
    2. B. set by the autopilot
    3. C. fixed and checked during rigging

  7. 7. Lavatory waste is serviced through:

    1. A. the passenger door and cabin aisle
    2. B. the fuel tank vent connection
    3. C. an external service panel

  8. 8. If a gyro instrument receives too little vacuum, it will:

    1. A. run slowly and indicate wrongly
    2. B. indicate correctly at all times
    3. C. overspeed and wear its bearings

  9. 9. Electrical bonding of a light aeroplane's control surfaces to the main structure is required so that:

    1. A. the surfaces can be used as the negative return for the landing lights
    2. B. all metal parts are at the same potential, preventing arcing and radio interference
    3. C. static charge is stored on the surfaces until landing

  10. 10. The maximum cabin differential pressure of a pressurised single-engine piston aeroplane is typically about:

    1. A. 9 psi
    2. B. 3.5 psi
    3. C. 15 psi

  11. 11. VOR navigation gives the pilot:

    1. A. the slant distance to the ground station
    2. B. the magnetic bearing (radial) from the station
    3. C. the aircraft's height above the terrain below

  12. 12. The flap position gauge of a light aeroplane with electric flaps is normally driven by:

    1. A. a position transmitter linked to the flap mechanism
    2. B. a spring scale in the cockpit
    3. C. a pressure gauge in the hydraulic system

  13. 13. Light-aircraft brakes are commonly bled by:

    1. A. pressure bleeding from the caliper to the reservoir
    2. B. draining all fluid and refilling it from the top
    3. C. running the engine so its pump circulates fluid

  14. 14. An electrical wire in a light aeroplane is sized according to:

    1. A. the colour and marking of its insulation
    2. B. the nominal voltage of the battery only
    3. C. current, length (voltage drop) and routing conditions

  15. 15. Before flight, a light twin's fire extinguisher pressure gauge is checked against:

    1. A. the engine oil pressure
    2. B. the altimeter setting
    3. C. a temperature-pressure chart

  16. 16. A TKS system may protect the propeller using:

    1. A. a slinger ring feeding the blades
    2. B. heated brushes on a slip ring assembly
    3. C. hot bleed air ducted into the spinner

  17. 17. The oxygen cylinder shut-off valve should be opened:

    1. A. quickly in one movement
    2. B. slowly
    3. C. only with a hammer

  18. 18. A fuel-flow totaliser on a light aeroplane:

    1. A. measures the tank level with capacitance
    2. B. calculates fuel used and remaining from fuel flow
    3. C. replaces the need for tank gauges

  19. 19. Light aircraft floating-caliper disc brakes allow the caliper to:

    1. A. slide on its pins to centre itself
    2. B. rotate together with the wheel
    3. C. lock the wheel until released by hand

  20. 20. Wing-tip strobe power supplies are usually mounted:

    1. A. close to the lamps they feed
    2. B. in the cockpit next to the switch panel
    3. C. inside the wing-tip fairing with the lamp fused separately

  21. 21. To trim a light aeroplane nose-up with an elevator trim tab, the trim tab trailing edge must move:

    1. A. up, in the same direction as the elevator
    2. B. up and then return to neutral when the elevator moves
    3. C. down, so that the air load on the tab holds the elevator up

  22. 22. A life raft carried on a light aeroplane must be stowed:

    1. A. where it can be removed and launched quickly
    2. B. already inflated behind the rear seats
    3. C. under the cabin floor in a sealed compartment

  23. 23. A secondary seat stop on the pilot seat rail of a light aeroplane is fitted to:

    1. A. lock the seat back in the upright position
    2. B. prevent the seat sliding fully aft if the primary lock fails
    3. C. limit how far the seat can move forward

  24. 24. Flushing a toilet in flight on an unpressurised aircraft relies on:

    1. A. the cabin pressure differential in flight
    2. B. an electric pump or gravity, not cabin pressure
    3. C. bleed air tapped from the engine

  25. 25. A dry vacuum pump must be installed in the correct rotation direction because:

    1. A. the vanes are designed to run one way
    2. B. the pump is lubricated by engine oil
    3. C. direction does not matter

  26. 26. Fatigue damage in a light-aircraft structure results from:

    1. A. a single load exceeding the ultimate strength
    2. B. high temperature alone with no applied load
    3. C. repeated cycles of load, even well below the ultimate strength

  27. 27. In the isobaric mode of a pressurisation controller:

    1. A. the differential stays constant as the aircraft climbs
    2. B. the outflow valve stays fully open
    3. C. cabin altitude stays constant as the aircraft climbs

  28. 28. HF radio is used on some light aircraft on long overwater flights because it:

    1. A. can communicate beyond line of sight using sky waves
    2. B. gives much better audio quality than VHF radio
    3. C. uses a much smaller antenna than a VHF radio

  29. 29. A torque tube interconnecting the left and right flaps ensures that:

    1. A. the flaps retract faster in flight
    2. B. the flap motor needs less current
    3. C. both flaps move together symmetrically

  30. 30. A hydraulic gear selector valve in neutral on an open-centre system:

    1. A. traps full pressure in the actuators
    2. B. stops the pump
    3. C. lets fluid flow through to return

  31. 31. On a light aeroplane with a split master switch, the 'ALT' half of the switch controls:

    1. A. the alternator field
    2. B. the battery contactor coil
    3. C. the avionics bus relay

  32. 32. The engine fire handle on a light twin, when pulled, typically:

    1. A. feathers the propeller of the opposite engine
    2. B. isolates fuel, hydraulic and electrical supplies to that engine
    3. C. opens the cowl flaps to cool the nacelle

  33. 33. A pitot heat element that has failed open will show on a pitot heat ammeter as:

    1. A. high current
    2. B. zero current
    3. C. normal current

  34. 34. A continuous-flow oxygen system with an altitude-compensating regulator:

    1. A. gives oxygen only when the user inhales
    2. B. supplies a fixed flow at all altitudes
    3. C. increases the flow as cabin altitude increases

  35. 35. On a light aeroplane, overwing refuelling requires care to avoid:

    1. A. underfilling the tanks on the far side
    2. B. overheating the fuel in the nozzle
    3. C. wing damage and static sparks

  36. 36. The landing gear emergency extension handle on many light retractable aeroplanes:

    1. A. retracts the gear faster than normal
    2. B. switches off the gear motor only
    3. C. releases the gear to free-fall

  37. 37. The navigation lights on a light aeroplane show:

    1. A. green left, red right and white at the tail
    2. B. white at both tips and red at the tail
    3. C. red left, green right and white at the tail

  38. 38. A saw-tooth (dog-tooth) leading edge on a wing produces a strong vortex that:

    1. A. reduces induced drag at the wing tip
    2. B. acts like a wing fence, reducing spanwise flow and tip stall
    3. C. increases the stall angle of the whole wing evenly

  39. 39. A cargo pod fitted under a light aeroplane has:

    1. A. its own maximum load placard
    2. B. no load limit
    3. C. the same limit as the cabin floor

  40. 40. Plywood gussets are used in wooden wing ribs to:

    1. A. act as the main spar web between the two spar caps
    2. B. provide a drain path for water trapped inside the rib
    3. C. reinforce the glued joints between cap strips and diagonals

  41. 41. Water quality samples may be taken to check for:

    1. A. chlorine level only
    2. B. water hardness
    3. C. bacterial contamination

  42. 42. A vacuum pump is replaced. Before returning to service, the technician should also:

    1. A. replace the propeller on that engine
    2. B. drain the fuel from that wing
    3. C. check filters, hoses and regulator

  43. 43. Strain is defined as:

    1. A. the change in length divided by the original length
    2. B. the force divided by the cross-sectional area
    3. C. the load at which permanent set occurs

  44. 44. Cabin heat on a light aeroplane is regulated by:

    1. A. changing the engine RPM with the throttle
    2. B. the cowl flap position selected by the pilot
    3. C. a valve that mixes or dumps the heated air

  45. 45. Compared with conventional VOR navigation, RNAV equipment lets a light aeroplane:

    1. A. fly only directly to or from a VOR station
    2. B. fly any desired path within navaid or GNSS coverage
    3. C. land automatically in low visibility conditions

  46. 46. Before control rigging checks, the aeroplane is first:

    1. A. levelled laterally and longitudinally
    2. B. fuelled to full tanks on both sides
    3. C. positioned with its nose into the wind

  47. 47. An accumulator in a light-aircraft hydraulic system:

    1. A. stores fluid at atmospheric pressure for the pump
    2. B. removes air bubbles from the returning fluid
    3. C. stores fluid under pressure and damps surges

  48. 48. The external power receptacle of a light aeroplane usually includes a:

    1. A. fuel shutoff valve interlock for refuelling safety
    2. B. transformer to step up the ground power voltage
    3. C. reverse-polarity protection against wrong connection

  49. 49. A fire detection system on a light piston twin commonly uses:

    1. A. smoke detectors fitted in the cockpit only
    2. B. thermal switches or a continuous loop in the nacelle
    3. C. carbon monoxide detectors in the cabin

  50. 50. Small cuts in a de-icing boot are repaired by:

    1. A. welding the rubber with a hot iron
    2. B. replacing the wing leading edge skin
    3. C. a cold patch and approved cement

Answer key

  1. 1. B — Jet fuel has very low anti-knock quality. In a piston engine it causes severe detonation, overheating and engine failure. Refuelling nozzles are designed to reduce the risk.
  2. 2. A — Steering springs connect the tailwheel to the rudder horn. Beyond a set angle the tailwheel unlocks to full swivel for tight turns.
  3. 3. C — They move with the gear; a switch often prevents operation with the gear up.
  4. 4. C — An antibalance tab moves in the same direction as the surface and adds aerodynamic resistance. It is used where the surface, such as a stabilator, is so effective that the pilot needs more feel to avoid over-controlling.
  5. 5. A — Each ring has a load rating; restraint must not exceed it.
  6. 6. C — On most light aeroplanes it is fixed; pitch trim uses a tab.
  7. 7. C — Ground carts connect to the panel to drain and rinse.
  8. 8. A — Low airflow lets the rotor slow and lose rigidity.
  9. 9. B — Bonding jumpers provide a low-resistance path across hinges and joints. Equal potential prevents sparking, pitting of hinges, radio noise and gives a path for lightning current.
  10. 10. B — Light piston aircraft use about 3.5 psi; high-performance jets about 9 psi.
  11. 11. B — The VOR receiver compares the phase of a reference and variable signal to determine the radial, i.e. the magnetic bearing from the station.
  12. 12. A — Electric flaps use a position transmitter (potentiometer or synchro) linked to the flap to drive the indicator. Manual flaps show position by the lever detents.
  13. 13. A — Pressure bleeding pushes fluid from the bleed valve at the caliper upward, forcing air out at the reservoir. Gravity bleeding from the top is also used.
  14. 14. C — Wire size is chosen so that it can carry the current without overheating and with acceptable voltage drop over its length, considering bundle and temperature conditions.
  15. 15. C — Agent pressure varies with temperature. The gauge reading is compared with the chart to confirm the bottle is fully charged.
  16. 16. A — Fluid is fed to a slinger ring and spread along the blades by centrifugal force.
  17. 17. B — Slow opening avoids heat of compression in the lines.
  18. 18. B — A totaliser integrates fuel flow over time to show fuel used and remaining, based on the initial quantity entered. Tank gauges are still required.
  19. 19. A — The caliper moves on its pins so both linings wear evenly.
  20. 20. A — Short high-voltage leads reduce losses and interference; follow the AMM for lead routing and bonding.
  21. 21. C — A trim tab moves opposite to the desired control-surface deflection. A tab deflected down creates an upward force on the elevator trailing edge, holding the elevator up and producing a nose-up pitching moment with no stick force.
  22. 22. A — Life rafts must be readily accessible and quickly removable so that occupants can launch them after a ditching. Serviceability and inspection dates must be checked.
  23. 23. B — If the primary seat latch disengages during take-off, the pilot may slide rearward away from the controls. A secondary stop or latch catches the seat before it moves fully aft.
  24. 24. B — Small aircraft usually have chemical or recirculating toilets that work without a cabin pressure differential.
  25. 25. A — Running a pump the wrong way can break vanes immediately.
  26. 26. C — Fatigue is progressive crack growth caused by cyclic loading such as gusts, landings and engine vibration. Cracks can start at stress concentrations and grow at loads well below static strength.
  27. 27. C — The controller holds the selected cabin altitude until maximum differential is reached; then it changes to constant differential mode.
  28. 28. A — HF signals are refracted by the ionosphere and return to earth at great distances, allowing communication far beyond VHF range. Quality is generally poorer and antennas are longer.
  29. 29. C — A mechanical interconnection keeps both flaps at the same position so an asymmetry cannot roll the aircraft.
  30. 30. C — In neutral the selector passes flow straight through, so the pump is not loaded.
  31. 31. A — The split master has BAT (battery contactor) and ALT (alternator field) halves. The ALT side can be switched off separately, e.g. in an overvoltage condition.
  32. 32. B — The fire handle isolates the engine by closing fuel and other valves and disconnecting the alternator, and arms the extinguisher.
  33. 33. B — An open element draws no current.
  34. 34. C — An altitude-compensating (aneroid-controlled) regulator adjusts the flow so that users receive more oxygen as altitude increases, conserving supply at lower altitudes.
  35. 35. C — Nozzles must be handled to avoid damage and bonded to prevent static discharge.
  36. 36. C — Gravity and springs extend the gear once released.
  37. 37. C — Position lights are red to port (left), green to starboard (right) and white to the rear, each covering specified angles.
  38. 38. B — The discontinuity at a saw-tooth sheds a vortex over the upper surface. This vortex acts as an aerodynamic fence, controlling spanwise flow and delaying outboard stall.
  39. 39. A — Pods have specific structural and CG limits.
  40. 40. C — Gussets are plywood plates glued (and sometimes nailed) over joints in a truss-type rib. They spread load across the glue area, strengthening the joint.
  41. 41. C — Laboratory testing confirms that the disinfection procedure has removed harmful bacteria.
  42. 42. C — The cause of failure and the system condition must be checked.
  43. 43. A — Strain is a dimensionless ratio: deformation divided by original dimension. Stress is force per unit area, and the elastic limit is where permanent deformation begins.
  44. 44. C — A cabin heat valve (often push-pull) directs heated air to the cabin or overboard, sometimes mixing it with fresh air to control temperature.
  45. 45. B — RNAV computes position from navigation sources (VOR/DME, GNSS, INS) and lets the aircraft fly between waypoints that need not be at navaid locations.
  46. 46. A — Rigging and travel measurements refer to the aircraft datum, so the aircraft is levelled at its levelling points.
  47. 47. C — An accumulator has a gas pre-charge separated from fluid by a diaphragm or piston. It stores energy, damps surges and provides emergency pressure.
  48. 48. C — External power circuits use a diode or relay so that the external power relay closes only when polarity is correct, protecting the aircraft system.
  49. 49. B — Engine fire detection uses thermal switches or a continuous-loop sensor that closes a warning circuit when temperature exceeds a set value.
  50. 50. C — Approved patch kits seal small damage; larger damage needs boot replacement.

Want timed papers with scoring by sub-module? part66exam.com/practice/a/module-11b