AD 2013-25-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | S-70 | Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Helicopters |
Unsafe Condition
A critical part remaining in service beyond its life limit due to previously being installed on a different helicopter model with higher usage and flight loads, which could result in fatigue failure of a critical part 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
Insert the component life prorating formula into the airworthiness limitation section of the maintenance manual or instructions for continued airworthiness. Calculate the new life limit for each specified part using the prorating formula and service life limits provided. Replace parts that have reached or exceeded their new life limit with airworthy parts. Do not install parts with unknown hours or where the Model SH-60 life limit is higher than the life limit on Models S-70, S-70A, and S-70C.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service (TIS)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-70, S-70A, and S-70C helicopters with specific parts installed, as listed in the AD, which were previously installed on certain military helicopter models.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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