AD Amdt-39-10130
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft-Manufactured Model S- 64E | Airworthiness Directives; Sikorsky Aircraft-Manufactured Model S- 64E Helicopters |
Unsafe Condition
Cracks in the main gearbox assembly second stage lower planetary plate (plate) due to fatigue cracking, which could lead to main gearbox failure 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 and rework the plate, establish a new retirement life for the plate, remove requirements of AD 77-20-01 for Model S-64F, and ensure compliance with inspections for magnesium chips in main transmission oil filter packs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Model S-64E and S-64F helicopters, including plates reworked under existing AD.
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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