Modules 17A and 17B Propeller
Propeller aerodynamics, construction, pitch control, synchronisation, ice protection, inspection, balancing and preservation.
How to prepare for UK Part-66 basic-knowledge examinations
Fix the intended A, B1, B2, B2L, B3, L or C route; use the regulatory module matrix and knowledge levels; then rehearse the exact MCQ and essay components that apply to each selected module.
Core concepts
Concept 1
Blade angle, relative airflow, rotational speed and aerodynamic loads determine propeller thrust, torque and vibration.
Exam cue: Identify propeller type and governing mode before troubleshooting.
Concept 2
Fixed, controllable, constant-speed, feathering and reverse systems use mechanical, hydraulic or electronic control suited to the installation.
Exam cue: Inspect damage against manufacturer limits rather than blending by appearance.
Concept 3
Module 17A supports A/B1 aeroplane routes; Module 17B is the B3-specific propeller branch.
Exam cue: Use the correct static or dynamic balancing and tracking procedure.
Risk pitfalls and guardrails
Moving or servicing a propeller without controlling ignition and stored-energy hazards.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Treating all leading-edge damage as field repairable.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Using 17A examination data for a B3 17B application.
Guardrail: Do not mix Category A, B1, B2/B2L, B3 or Category L module variants, or treat the aggregate 601-item study allocation as an official CAA examination total.
Memory anchors
Blade Element
Each blade section produces aerodynamic force from its local angle and relative airflow.
Constant Speed
The governor changes pitch to maintain selected rotational speed.
Feather
Feathering reduces drag after the applicable power loss or shutdown.
Balance
Static and dynamic imbalance require different evidence and correction.
17A / 17B
17A serves A/B1; 17B is the B3-specific propeller module.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
At a specified radial station, which angle is measured between a propeller blade chord and the plane of rotation?
Why does a propeller blade have geometric twist?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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