airworthiness · Rule · Final rule; request for comments. · Published 2006-04-21 · Effective 2006-05-08 · 71 FR 20531
Document
Document number
06-3765
Federal Register citation
71 FR 20531
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Pratt & Whitney Canada (PWC) PW535A Turboshaft
Publication date
2006-04-21
Effective date
2006-05-08
FAA docket
Docket No. FAA-2006-24117
Abstract
The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney Canada (PWC) PW535A turboshaft engines with serial numbers (SNs) lower than DC0241, and with hydromechanical fuel control (HFC) part number (P/N) 819735-4, 819735-5, or 819735-6 installed. This AD requires inspection and verification of the proper adjustment of the ratio unit setscrew adjustment of installed HFC units. This AD results from incidents of PW535A turboshaft engines experiencing lack of response to the power lever input during attempted engine acceleration, due to an incorrect adjustment of the HFC ratio unit setscrew. We are issuing this AD to prevent lack of engine response to power lever input, which could cause a single or dual engine in-flight shutdown event.