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Module 12 — Helicopter Aerodynamics, Structures and Systems
12.4 — Transmissions
Practice questions test what you know. This note teaches what you don’t.
Question banks train recall. The questions that decide a pass are the borderline ones, where two answers look right — and those are won by understanding. That is what this note is written for.
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10 sections
2 worked examples
3 key formulas
8 tables
2 diagrams
3 tips
3 warnings
47 exam-style questions in our bank test this topic. This note teaches the theory behind every one of them.
What you will learn
- Main Gearbox (MGB)
- Intermediate and Tail Rotor Gearboxes
- Freewheeling Units (Overrunning Clutches)
- Rotor Brakes
- Transmission Lubrication and Cooling
- Drive Shafts, Couplings, and Hangers
- Chip Detectors and Debris Monitoring
- Health and Usage Monitoring Systems (HUMS) for Transmissions
- Gearbox Inspection and Maintenance
- Over-Torque and Over-Speed Procedures
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