# Proposed AD 95-ANE-55: AlliedSignal Inc. TFE731 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 96-18-13
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 22, 1996, 61 FR 11790
- Comments due: May 21, 1996
- Became: [AD 96-18-13](https://openairdocs.org/ad/96-18-13)
- Docket: 95-ANE-55
- FR document: 96-6972
- Official PDF: https://openairdocs.org/files/sha256/d8/6c/d86cf4da15f91ca89aac14e05faf67f3476ede32e481baac433920ee65243ee3 (from https://www.govinfo.gov/content/pkg/FR-1996-03-22/pdf/96-6972.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/03/22/96-6972/airworthiness-directives-alliedsignal-inc-tfe731-series-turbofan-engines
- Page: https://openairdocs.org/proposed/95-ANE-55

## Summary

This document proposes the adoption of a new airworthinessdirective (AD) that is applicable to AlliedSignal Inc. (formerly Garrett Engine Division) TFE731 series turbofan engines. This proposal would require removing certain fan rotor disks from service in accordance with a drawdown schedule, and would establish new fan rotor disk life limits. This proposal is prompted after additional analyses revealed that stress levels in the fan rotor disk dovetail slots for the applicable engine models are higher than initially calculated. The actions specified by the proposed AD are intended to prevent uncontained failure of the fan rotor disk due to fatigue cracking in the dovetail slots, which can result in inflight engine shutdowns, severe secondary damage, and fan rotor assembly separation from the engine.

## Notices in this docket

- Mar 22, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-6972, comments due May 21, 1996 (https://www.federalregister.gov/documents/1996/03/22/96-6972/airworthiness-directives-alliedsignal-inc-tfe731-series-turbofan-engines)

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