AD 74-20-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61A | Airworthiness Directives; Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61R | Airworthiness Directives; Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM Helicopters |
Unsafe Condition
Loose or missing screws or cracks in the outboard end of the main rotor blades, including the tip cap and tip cap bracket, which could lead to blade failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect main rotor blades for loose/missing screws or cracks using specified service bulletin methods. Repair or replace blades with issues before further flight. Inspections must be done at intervals based on blade series and operating weight, with compliance required within specified hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD, with inspections due within specific timeframes (e.g., 30, 50, 200 hours) after the effective date and at intervals thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Models S-61A, S-61L, S-61N, S-61R, and S-61NM helicopters equipped with S6115-20501, S6115-20601, S6117-20101, or S6188-15001 series main rotor blades.
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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