AD 2017-02-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters |
Unsafe Condition
Failed tail rotor pitch change shaft (TRPCS) assembly bearings with subsequent loss of tail rotor control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Before further flight, remove the TRPCS assembly and inspect the bearing. Replace the TRPCS assembly if the bearing does not rotate freely, sounds rough, has purged grease with metal particles, or shows nicks, dents, cuts, tears, or distortions in the bearing seal. Within 10 hours time-in-service (TIS) and thereafter at intervals not exceeding 10 hours TIS, inspect the TRPCS assembly with a borescope. Replace the TRPCS assembly before further flight if the white Teflon seal or snap ring is missing, or if there is a rip, tear, or heat damage on the seal or no gap in the snap ring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-92A helicopters with TR pitch change shaft (TRPCS) assemblies, part numbers 92358-06303-041 or 92358-06303-042, regardless of time-in-service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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