AD Amdt-39-11235
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft-Manufactured Model CH-54B | Airworthiness Directives; Sikorsky Aircraft-Manufactured Model CH-54B Helicopters |
Unsafe Condition
Fatigue cracking of the second stage lower planetary plate (plate) could lead to failure of the main gearbox 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
Inspect the second stage lower planetary plate for cracks. Perform rework or replacement of the plate if cracks are found. Conduct initial and recurring inspections as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified inspection intervals as outlined in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft-manufactured Model CH-54B helicopters.
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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