AD 2015-26-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters |
Unsafe Condition
Unsecured jet bore liners that have protruded, leading to MGB low oil pressure warnings and potential loss of oil in the MGB, which could result in failure of the MGB and subsequent loss of control of the helicopter.
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Required Actions
Inspect the main gearbox (MGB) lower housing jet bores for leaks, paint or caulk blistering, and liner protrusion. Replace the MGB if there is oil leakage or protrusion of a jet bore liner. Replace the MGB within 3,750 hours time-in-service (TIS).
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Compliance Time
Within 50 hours time-in-service (TIS) for initial inspection; within 3,750 hours TIS for MGB replacement.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, S-76B, and S-76C helicopters with a main gearbox (MGB) installed that has undergone certain repairs, specifically those with MGB part numbers 76351-09000 series, 76351-09500 series, and 76351-09600 series, and repaired in accordance with Sikorsky ORI No. 76350-065 or earlier revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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