AD 85-06-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C30 | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. Model 250-C30 and -C30S Engines |
| engine | Rolls-Royce Corporation | 250-C30S | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. Model 250-C30 and -C30S Engines |
Unsafe Condition
Magnetic plugs (P/N 23001915) in the power and accessory gearbox cover and housing assembly may accumulate metal fuzz, which could lead to engine failure.
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Required Actions
Replace the P/N 23001915 magnetic plugs with P/N 6871534 magnetic plugs, following Allison Commercial Engine Alert Bulletin 250-C30, -C30S CEB-A-72-3098, Revision 1 dated January 15, 1985, or FAA-approved equivalent.
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Compliance Time
Within the next 50 hours time in service after the effective date of this AD, but not later than May 15, 1985
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Affected Aircraft
Allison Gas Turbine Division, General Motors Corp. Model 250-C30 and -C30S engines with P/N 23001915 magnetic plugs installed in Sikorsky S-76A helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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