AD 2006-08-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | & Whitney Canada (PWC) PW535A Turboshaft | Airworthiness Directives; Pratt & Whitney Canada (PWC) PW535A Turboshaft Engines |
Unsafe Condition
PW535A turboshaft engines experiencing lack of response to the power lever input during engine acceleration, due to an incorrect adjustment of the HFC ratio unit setscrew.
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Required Actions
Inspect and verify the proper adjustment of the ratio unit setscrew of installed HFC units with part numbers 819735-4, 819735-5, or 819735-6. Use PWC Alert Service Bulletin (ASB) No. PW500-72-A30257, Revision 1, dated December 3, 2004, for the inspection and adjustment procedures.
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Compliance Time
Within 50 flight hours time-in-service after the effective date of this AD.
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Affected Aircraft
Pratt & Whitney Canada (PWC) PW535A turboshaft engines with serial numbers lower than DC0241, and with hydromechanical fuel control (HFC) part number (P/N) 819735-4, 819735-5, or 819735-6 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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