AD 2017-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters |
Unsafe Condition
A loose jamnut could result in failure of a pushrod assembly, loss of M/R flight control, 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
Inspect the control rod of each pushrod assembly to determine if 0.020 inch diameter lockwire can pass through the inspection hole. If lockwire passes, replace the pushrod assembly before further flight. If lockwire does not pass, inspect the jamnut for seating and finger pressure. If jamnut is not seated or can be turned, replace the pushrod assembly before further flight. If jamnut is seated and cannot be turned, apply 140 inch-pounds of torque to the jamnut. Apply two slippage marks across each control rod and jamnut.
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Compliance Time
Within 300 hours time-in-service
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, S-76B, S-76C, and S-76D helicopters, serial numbers up to and including 761075, with a main rotor (M/R) servo pushrod assembly part number 76400-00034-059, 76400-00014-074, 76400-00014-076, or 76400-00014-077 installed.
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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