FAA Aviation Mechanic General (AMG)Ground Operations and ServicingHard
An aircraft must be parked overnight on a sloped ramp with the parking brake released for tire pressure equalization. In what order should the wheel chocks be installed to prevent the aircraft from rolling?
- AInstall chocks on the uphill side first, then the downhill side
- BInstall chocks only on the uphill side of the wheels
- CInstall chocks simultaneously on the nose wheel only
- DInstall chocks on the downhill side first, then the uphill side
Show answer & explanationAnswer & explanation
Correct answer: D. Install chocks on the downhill side first, then the uphill side
When chocking on a slope, the downhill side must be secured first to immediately prevent any rollaway tendency, followed by chocking the uphill side for full restraint in both directions.
Why the other options are wrong
- A. Chocking uphill first allows the aircraft to roll downhill before the critical chock is placed.
- B. Chocking only the uphill side leaves the aircraft free to roll downhill.
- C. Chocking only the nose wheel does not adequately restrain a multi-wheel aircraft on a slope.
Wheel Chocking on a Slope
Procedure for placing wheel chocks to prevent aircraft rollaway when parked on an inclined surface.
- Downhill side chocked first for immediate restraint
- Uphill side chocked second for full security
- Chocks must seat snugly against tires
Memory trick: Downhill first stops the runaway before it starts.