AD 74-25-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Models S-61L, S-61N, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Models S-61L, S-61N, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; Sikorsky Models S-61L, S-61N, and S-61NM Helicopters |
Unsafe Condition
The engine air inlet deflector installation (P/N S6107-21115 Series) may cause an unsafe condition due to reduced engine inlet air flow, leading to potential engine power loss or failure.
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Required Actions
Reduce each takeoff gross weight limitation in the FAA approved flight manuals by 800 pounds until specific revisions are incorporated into the flight manuals. Incorporate the required revisions to the flight manuals as specified in paragraphs (a), (b), or (c).
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Compliance Time
prior to next flight
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Affected Aircraft
Sikorsky Models S-61L (including serial no. 61425 and subsequent), S-61N, and S-61NM helicopters equipped with engine air inlet deflector installation (P/N S6107-2115 Series)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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