Free UK CAA Part-66 Module 17A Propeller B1.1 Practice Questions

Sample Practice Questions

Try these 10 sample questions from the UK CAA Part-66 Module 17A Propeller B1.1 practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1What does a propeller primarily convert engine shaft power into?

   1. A.Forward thrustCorrect answer: A
   2. B.Electrical output
   3. C.Compressor pressure
   4. D.Exhaust heat

   Explanation: The FAA handbook states: "the propeller transforms the rotary power of the engine into thrust." The rotating blades act as airfoils and produce thrust.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-2

2. 2How are blade stations normally located on a propeller?

   1. A.By distance from the blade tip
   2. B.By distance from the hub centreCorrect answer: B
   3. C.By angle from the leading edge
   4. D.By percentage of engine shaft length

   Explanation: The FAA handbook states: "segments that are located by station numbers in inches from the center of the blade hub." A station is a radial position measured from the centre.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-3

3. 3What variable is selected by changing compression of a constant-speed governor's speeder spring?

   1. A.The engine rpm settingCorrect answer: A
   2. B.The propeller blade diameter
   3. C.The engine oil temperature
   4. D.The propeller's geometric twist

   Explanation: The FAA handbook states: "the rpm setting is made by varying the amount of compression in the speeder spring." The control changes the reference speed against which centrifugal flyweight force is balanced.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-12

4. 4What is the basic controlled variable in propeller synchronization?

   1. A.Propeller rpmCorrect answer: A
   2. B.Engine oil temperature
   3. C.Blade track clearance
   4. D.Engine exhaust pressure

   Explanation: The FAA handbook states: "synchronizing engine rpm." Synchronization brings rotational speeds together.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-19, Propeller Synchronization & Synchrophasing

5. 5Why can uneven ice accumulation on a propeller produce severe vibration?

   1. A.It creates propeller imbalanceCorrect answer: A
   2. B.It holds the governor exactly on speed
   3. C.It removes centrifugal loading
   4. D.It makes all blades equally heavy

   Explanation: The FAA handbook states: "ice collects asymmetrically on a propeller blade and produces propeller unbalance and destructive vibration" Asymmetric mass accumulation unbalances the rotating assembly.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-17

6. 6A sharp nick is found in a metal propeller blade. Why does it require prompt assessment against repair limits?

   1. A.It can concentrate stress and initiate fatigueCorrect answer: A
   2. B.It always increases the blade's permitted rpm
   3. C.It automatically corrects a mass imbalance
   4. D.It prevents the governor from sensing rpm

   Explanation: The FAA handbook states: "fatigue failure resulting from the concentration of stresses at the bottoms of sharp nicks, cuts, and scratches." A sharp defect is a stress raiser; acceptance depends on applicable repair data.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-21

7. 7Which routine interval does Hartzell Manual 202A specify for evaluating preferred storage conditions?

   1. A.Every month
   2. B.Every six months
   3. C.Every yearCorrect answer: C
   4. D.Only when the propeller is unpacked

   Explanation: The applicable Hartzell instruction specifies "Annually". Evaluate the environment yearly.

   Reference: Hartzell Standard Practices Manual 202A, Volume 7 — Packaging and Storage, p. 3-3

8. 8How is propeller efficiency expressed in terms of power?

   1. A.Brake horsepower divided by thrust horsepower
   2. B.Thrust horsepower divided by brake horsepowerCorrect answer: B
   3. C.Thrust horsepower plus brake horsepower
   4. D.Brake horsepower minus thrust horsepower

   Explanation: The FAA handbook states: "propeller efficiency is the ratio of thrust horsepower to brake horsepower." Useful propulsive output is divided by shaft power input.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-2

9. 9Which material forms the envelope of the composite propeller blade illustrated in the FAA handbook?

   1. A.Solid forged steel
   2. B.Laminated hardwood
   3. C.Carbon/glass fibreCorrect answer: C
   4. D.Cast aluminium alloy

   Explanation: Figure 7-32 labels the blade covering "Carbon/glass fiber envelope". The illustrated composite blade uses a fibre envelope around its internal structure.

   Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-21, Figure 7-32

10. 10In a conventional governor, what happens to the flyweights during an underspeed?

    1. A.They tilt outward against the spring
    2. B.They tilt inward under the spring forceCorrect answer: B
    3. C.They lock at the maximum pitch stop
    4. D.They disconnect from the pilot valve

    Explanation: The FAA handbook states: "the flyweights tilt inward because there is not enough centrifugal force on the flyweights to overcome the force of the speeder spring." Below selected rpm, flyweight centrifugal force is insufficient to balance the spring.

    Reference: FAA Aviation Maintenance Technician Handbook—Powerplant, Chapter 7 — Chapter 7, p. 7-9