AD 88-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PT6B-36A | PRATT & WHITNEY CANADA Model PT6B-36A Engines |
Unsafe Condition
Failure of the third stage compressor stator vane assembly could result in loss of engine power or an inflight engine shutdown.
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Required Actions
Install vibration damping device P/N 3112128-01 on vane assembly P/N 3109163-01 per SB A-11033. Remove and replace vane assembly P/N 3109163-01 within specified time limits. Placard N1 speed restrictions and update flight manuals.
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Compliance Time
Prior to further flight for placarding and flight manual updates. For engines with ≤25 hours TIS from effective date: install damping device before 25 hours TIS, remove vane before 600 hours TIS. For engines with >25 hours TIS: install damping within 25 hours TIS, remove vane within 100 hours after installation. Thereafter, remove vane before 600 hours TIS since new.
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Affected Aircraft
Pratt & Whitney Canada PT6B-36A engines with serial number PC-E36043 and subsequent, or those incorporating Service Bulletin 11022. Installed in Sikorsky S-76B helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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