AD 82-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bendix | Magnetos | Airworthiness Directives; BENDIX: Applies to Bendix Engine Products Division Magnetos |
Unsafe Condition
Failure of impulse coupling due to improperly heat treated (soft) flyweights resulting in engine damage or failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect flyweights by filing test, replace cam/impulse coupling if soft, inspect stop pins, torque castellated nut to 15-25 ft. lb., replace cotter pin, stamp identification plate with 'F', and log compliance. Inspect spare parts similarly and mark acceptable ones with yellow dye/lacquer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 10 hours of engine operation unless already accomplished for all affected impulse couplings having less than 300 operating hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bendix Engine Products Division magnetos with type designations S4LN-21/S4RN-21, S6LN-21/S6RN-21, S6LN-23/S6RN-23, S4LN-1225/S4RN-1225, S4LN-1225/S4RN-1227, S6LN-1225/S6RN-1225, S6LN-1227/S6RN-1227, S4LN-200 P/N 10-163005-7, D4LN-2021/D4RN-2021, D4LN-2031/D4RN-2021, D4LN-2031/D4RN-2031, D6LN-2021/D6RN-2021, D4LN-3000/D6RN-3000, and all Blue Label impulse coupled magnetos of the above types except serial numbers 8236001 and above. Excludes Bendix Red Label magnetos with specified serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.