Airworthiness Directives; AlliedSignal Inc. TSCP700-4B, -4E, and -5 Auxiliary Power Units
airworthiness · Rule · Final rule. · Published 1996-10-09 · Effective 1996-12-09 · 61 FR 52876
Document
Document number
96-25168
Federal Register citation
61 FR 52876
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
1996-10-09
Effective date
1996-12-09
FAA docket
Docket No. 95-ANE-68
Abstract
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Inc. (formerly Garrett) TSCP700-4B, -4E, and -5 auxiliary power units (APUs), that requires removal from service of certain high pressure turbine (HPT) disks identified by serial number, and replacement with serviceable parts. This amendment is prompted by the discovery of a material defect in certain HPT disk forgings that may result in HPT disk rupture prior to reaching the disk cyclic life limit. The actions specified by this AD are intended to prevent an HPT disk rupture.