AD 76-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S- 61NM, and S-61R Helicopters Including Military CH-3C, HH-3C, CH- 3E, and HH-3E Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S- 61NM, and S-61R Helicopters Including Military CH-3C, HH-3C, CH- 3E, and HH-3E Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S- 61NM, and S-61R Helicopters Including Military CH-3C, HH-3C, CH- 3E, and HH-3E Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61R | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S- 61NM, and S-61R Helicopters Including Military CH-3C, HH-3C, CH- 3E, and HH-3E Helicopters |
Unsafe Condition
Fractures in NAS 577-10 or NAS 577-10A barrel nuts used for attaching the transmission main gearbox to the fuselage structure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove NAS 577-10 or NAS 577-10A barrel nuts and replace with RMLH 2577-108 barrel nuts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 30 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Models S-61L, S-61N, S-61NM, S-61R helicopters including Military CH-3C, HH-3C, CH-3E, and HH-3E helicopters using NAS 577-10 or NAS 577-10A barrel nuts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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