# Proposed AD 96-ANE-08: AlliedSignal Inc. TFE731 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-04-03
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 10, 1996, 61 FR 36310
- Comments due: September 9, 1996
- Became: [AD 97-04-03](https://openairdocs.org/ad/97-04-03)
- Docket: 96-ANE-08
- FR document: 96-17534
- Official PDF: https://openairdocs.org/files/sha256/c2/71/c271adc30fef7b4a736c10a6157a42fa50da423e209753ec0cb5119bf6081738 (from https://www.govinfo.gov/content/pkg/FR-1996-07-10/pdf/96-17534.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/07/10/96-17534/airworthiness-directives-alliedsignal-inc-tfe731-series-turbofan-engines
- Page: https://openairdocs.org/proposed/96-ANE-08

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to AlliedSignal Inc. TFE731 series turbofan engines. This proposal would require removal from service of certain low pressure turbine (LPT) seal plates prior to accumulating the new, reduced cyclic life limit, and replacement with serviceable LPT seal plates. This proposal is prompted by a report that the machined LPT seal plate geometry did not meet the design intent due to drawing ambiguity. The actions specified by the proposed AD are intended to prevent fatigue cracking and subsequent uncontained failure of an LPT seal plate.

## Notices in this docket

- Jul 10, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-17534, comments due Sep 9, 1996 (https://www.federalregister.gov/documents/1996/07/10/96-17534/airworthiness-directives-alliedsignal-inc-tfe731-series-turbofan-engines)

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