AD 2015-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada Corp | Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines |
Unsafe Condition
Axial migration of the No. 10 bearing in the engine reduction gearbox (RGB) assembly, caused by non-optimal bearing internal clearance, which could lead to engine overtorque, failure of the engine, in-flight shutdown, and loss of the rotorcraft.
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Required Actions
Inspect the No. 10 bearing, part number (P/N) 3310433-03, in the RGB assembly for axial movement within 50 flight hours after the effective date. If the bearing fails inspection, replace the No. 9 and No. 10 bearings before further flight. Perform repetitive inspections as specified based on total time since new (TSN). Eventually, remove and replace the No. 9 and No. 10 bearings for specific engine serial numbers within 450 flight hours or 42 months after the effective date.
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Compliance Time
Within 50 flight hours after the effective date
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Affected Aircraft
Pratt & Whitney Canada Corp. PT6B-37A turboshaft engines with engine serial numbers identified in Table 1 of P&WC Service Bulletin (SB) No. PT6B-72-39095, Revision No. 3, dated December 29, 2014.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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