Free UK CAA Part-66 Module 13 Aircraft Aerodynamics, Structures and Systems (B2) Practice Questions

Sample Practice Questions

Try these 10 sample questions from the UK CAA Part-66 Module 13 Aircraft Aerodynamics, Structures and Systems (B2) practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1Which primary control surface produces aircraft roll about the longitudinal axis?

   1. A.The rudder on the vertical stabiliser
   2. B.The elevator on the horizontal stabiliser
   3. C.The ailerons on the wingsCorrect answer: C
   4. D.The trim tab on the elevator

   Explanation: The FAA states: "Ailerons are the primary flight control surfaces that move the aircraft about the longitudinal axis." Ailerons produce roll. The rudder controls yaw; the elevator controls pitch; its trim tab relieves pitch-control force.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 1, Ailerons, p. 1-24

2. 2During a closed-loop autopilot check, which function should progressively reduce the correction as the commanded condition is approached?

   1. A.The manual disconnect switch
   2. B.The command selector alone
   3. C.The warning annunciator circuit
   4. D.The feedback or follow-up elementCorrect answer: D

   Explanation: The source states: "Various electric feedback, or follow-up signals, are generated to progressively reduce the error message in the autopilot so that continuous over correction does not take place." Feedback opposes the error as correction progresses. A selector supplies the target; disconnect and annunciation do not provide continuous follow-up.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 10, Feedback or Follow-up Element, pp. 10-61–10-62

3. 3Why can an installed emergency locator transmitter continue sending a distress signal after the aircraft's normal electrical supply is lost?

   1. A.It draws energy from a dedicated independent batteryCorrect answer: A
   2. B.It uses the main aircraft battery through the normal master switch
   3. C.It relies on a capacitor charged only during each test cycle
   4. D.It requires the normal aircraft AC generators to remain online

   Explanation: The source states: "An emergency locator transmitter (ELT) is an independent battery powered transmitter" Independent battery power lets the ELT operate without normal aircraft electrical supply. It is not dependent on the master-switched bus, a test-cycle capacitor or running AC generators.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 11, Emergency Locator Transmitter (ELT), p. 11-63

4. 4Why must the specified material, length and cross-section of thermocouple indicator leads be preserved during replacement?

   1. A.Lead dimensions affect installation fit but cannot affect circuit response
   2. B.Changing them can alter circuit resistance and the indicationCorrect answer: B
   3. C.Any conducting material gives the same thermoelectric response
   4. D.Only the hot junction matters; return-lead resistance is immaterial

   Explanation: The FAA states: "thermocouple leads are designed to provide a specific amount of resistance in the thermocouple circuit (usually very little)." The specified lead characteristics are part of the measuring circuit. Changes in material, length or cross-section require appropriate compensation for the resistance change; mechanical fit alone is insufficient.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 10, Thermocouple Temperature Indicators, pp. 10-37–10-38

5. 5Which function characterises a central maintenance computer's interface with other aircraft systems?

   1. A.Acting as the sole flight-control computer for every connected system
   2. B.Loading replacement software as its only means of diagnosing a fault
   3. C.Storing only usage totals without communicating system malfunctions
   4. D.Communicating system problems and supporting central checkout and fault isolationCorrect answer: D

   Explanation: The FAA defines the system as "The unit, components and associated systems which interface with other airplane systems and provides a convenient way of communicating system problems to aircraft maintenance personnel." The central maintenance interface supports checkout and isolation of malfunctions. It is distinct from flight control, software-loading alone or a usage counter that does not communicate faults.

   Reference: FAA Joint Aircraft System/Component Code Table and Definitions — 4500, Central Maintenance Computer, printed p. 36

6. 6What is the purpose of a crossfeed arrangement in a twin-engine fuel system?

   1. A.Moving fuel between storage tanks to alter fuel distribution
   2. B.Dumping fuel overboard to reduce the aircraft's weight
   3. C.Feeding an engine from a tank on the opposite sideCorrect answer: C
   4. D.Connecting tank vapour spaces to equalise vent pressure

   Explanation: The source states: "This allows fuel to crossfeed from one side of the aircraft to the opposite engine if desired." Crossfeed supplies an engine from the opposite side. Tank-to-tank transfer, jettison and vent equalisation are different fuel-system functions.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 14, Multiengine Reciprocating Aircraft Fuel Systems

7. 7What distinguishes anti-icing equipment from deicing equipment in its basic intended use?

   1. A.Anti-icing prevents ice formation; deicing removes accumulated iceCorrect answer: A
   2. B.Anti-icing removes accumulated ice; deicing prevents its formation
   3. C.Both remove existing ice; the distinction is only the energy source
   4. D.Both prevent initial ice; the distinction is only the surface protected

   Explanation: The source states: "Anti-icing equipment is turned on before entering icing conditions and is designed to prevent ice from forming." The distinction is prevention versus removal. Different energy sources and protected surfaces can be used for either role, so they do not define the two terms.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 15, Ice Prevention

8. 8After a sodium-chlorate passenger oxygen generator has been ignited, what normally happens if the user's mask is no longer being breathed through?

   1. A.It supplies oxygen only during inhalation and stops between breaths
   2. B.It switches off electrically and retains the charge for repeated reuse
   3. C.It continues producing oxygen until its chemical charge is exhaustedCorrect answer: C
   4. D.Its output is stored for reuse by closing a gaseous-cylinder valve

   Explanation: The source states: "Once lit, a sodium chlorate oxygen generator cannot be extinguished." The ignited chemical generator continues to burnout. It is distinct from demand-flow regulation, an electrically reversible supply or stored gaseous oxygen controlled by a cylinder valve.

   Reference: FAA Aviation Maintenance Technician Handbook—Airframe — Chapter 16, Chemical or Solid Oxygen

9. 9What distinguishes an integrated modular avionics architecture from a traditional arrangement of separate function-specific computers?

   1. A.Multiple applications can use common hardware/software resourcesCorrect answer: A
   2. B.Each function has a standalone LRU with dedicated computing resources
   3. C.Separate analogue instruments operate without shared application hosting
   4. D.Dedicated hardwired controllers use only point-to-point control signals

   Explanation: The source states: "A resource may be shared by multiple applications" IMA provides shared platform resources to hosted applications. The other choices describe separate function-specific or non-hosted architectures rather than this defining shared-platform arrangement.

   Reference: FAA AC 20-170: Integrated Modular Avionics — Appendix E, Integrated modular avionics; Resource

10. 10What is the principal purpose of an aircraft electronic-library information system?

    1. A.Collect live fault reports and perform onboard diagnostic tests
    2. B.Compute flight-guidance commands from navigation sensor inputs
    3. C.Store, update and retrieve information formerly supplied on paperCorrect answer: C
    4. D.Record cockpit speech for later accident investigation

    Explanation: The source states: "storing, updating and retrieving digital information traditionally provided on paper, microfilm or microfiche." Electronic-library systems manage digital information that replaces paper or similar media. Maintenance diagnostics, guidance computation and cockpit voice recording are different functions.

    Reference: UK Part-66 Appendix I: Basic Knowledge Requirements — Appendix I, Module 13.22 Information Systems (ATA 46)