Airworthiness Directives; Pratt & Whitney Canada, Auxiliary Power Units
airworthiness · Rule · Final rule. · Published 2012-09-17 · Effective 2012-10-22 · 77 FR 57001
Document
Document number
2012-22532
Federal Register citation
77 FR 57001
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2012-09-17
Effective date
2012-10-22
FAA docket
Docket No. FAA-2012-0071
Abstract
We are adopting a new airworthiness directive (AD) for certain serial numbers of Pratt & Whitney Canada (P&WC) PW901A auxiliary power units (APUs) approved under Technical Standard Order TSO-C77A and installed on, but not limited to, Boeing 747-400 series airplanes. This AD requires modifications of the rear gas generator case, exhaust duct support, and turbine exhaust duct flanges. This AD was prompted by several events of high-pressure turbine blade fracture leading to separation of the rear gas generator case and release of high energy debris. We are issuing this AD to prevent separation of the rear gas generator case and release of high energy debris, which could result in injury and damage to the airplane.