AD 93-23-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PT6A-50 | PRATT & WHITNEY CANADA Model PT6A-50 Series Engines |
Unsafe Condition
Engine failure debris causing aircraft damage due to metal debris in the engine chip detector and open circuit wiring in the airframe chip detector flag system.
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Required Actions
Inspect the airframe chip detector flag system daily starting one calendar day after the effective date. Within 50 hours time in service, remove and inspect the engine chip detector for metal debris, replace part number 3040019 with 3026609, inspect circuit wiring, perform a one-time grounding check, inspect main oil filter, and replace PT shroud by December 31, 1994.
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Compliance Time
Within one calendar day after the effective date, within 50 hours time in service, thereafter at intervals not to exceed 100 hours time in service, and PT shroud replacement by December 31, 1994.
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Affected Aircraft
Pratt & Whitney Canada PT6A-50 series engines installed on but not limited to DeHavilland DHC-7 turboprop aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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