AD 00-23583
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft-Manufactured Model CH-54A | Airworthiness Directives; Sikorsky Aircraft-Manufactured Model CH-54A Helicopters |
Unsafe Condition
Failure of the second stage lower planetary plate due to fatigue cracking, which could result in failure of the main gearbox, failure of the drive system, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct initial and recurring inspections and rework or replace the second stage lower planetary plate if necessary. Add two additional TC holders to applicability and update one TC holder due to ownership transfer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft-manufactured Model CH-54A helicopters under specific TC holders, including two additional TC holders and a transferred ownership TC holder.
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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