# Airworthiness Directives; AlliedSignal Inc. TSCP700-4B, -4E, and -5 Auxiliary Power Units
> **Rule** · Final rule. · Published 1996-10-09 · Effective 1996-12-09 · 61 FR 52876
## Document
- **Document number:** 96-25168
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 61 FR 52876
- **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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/10/09/96-25168/airworthiness-directives-alliedsignal-inc-tscp700-4b--4e-and--5-auxiliary-power-units)
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