airworthiness · Rule · Final rule. · Published 2013-02-19 · Effective 2013-03-26 · 78 FR 11563
Document
Document number
2013-03266
Federal Register citation
78 FR 11563
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Pratt & Whitney Canada Corp Turboshaft
Publication date
2013-02-19
Effective date
2013-03-26
FAA docket
Docket No. FAA-2012-1005
Abstract
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) PT6C-67C turboshaft engines. This AD requires initial and repetitive borescope inspections to verify the presence of a retaining ring securing the power turbine (PT) baffle located near the second stage PT disk. If the engine fails the inspection, this AD also requires removing the engine from service before further flight. This AD was prompted by five reported incidents of second stage PT disk damage. We are issuing this AD to prevent damage to the PT disk which, if undetected, could cause uncontained PT disk failure and loss of control of the helicopter.