AD 78-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61A | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, and S-61A Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, and S-61A Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, and S-61A Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, and S-61A Helicopters |
Unsafe Condition
Cracking of fitting assemblies and tube assemblies in the landing gear system could result in structural failure of the landing gear components.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service and replace specific fitting assemblies within 10 landings; inspect and replace cracked fitting assemblies within 15 hours time in service or 120 landings intervals; inspect and replace cracked tube assemblies based on landing thresholds; and remove certain main landing gear tube assemblies after 32,000 landings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified intervals: 10 landings, 15 hours time in service, 120 landings, or as per landing thresholds noted in the 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, and S-61A helicopters with fixed S-61L type landing gears.
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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