AD 2020-18-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leonardo | S.p.a. | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
A cracked pinion installed in the rotor brake quill could result in failure of the pinion with detachment of parts inside the transmission that could cause its malfunction or jamming, ultimately resulting in loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 75 hours TIS, remove from service pinion P/N 412-040-301-101 having serial number (S/N) C17987, C17990, or C17991. Within 100 hours TIS, perform an MPI for a crack on each pinion P/N 412-040-301-101 if the rotor brake quill has never been overhauled. If there is a crack, remove the pinion from service before further flight. Prohibit installing pinion P/N 412-040-301-101 having S/N C17987, C17990, or C17991 on any helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 75 hours TIS
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Leonardo S.p.a. Helicopters, Model AB412 and AB412EP, with pinion P/N 412-040-301-101 having serial number (S/N) C17987, C17990, or C17991.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.