# Proposed AD 95-ANE-01: AlliedSignal, Inc. AL5512 Series Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 26, 1996, 61 FR 13111
- Comments due: May 28, 1996
- Docket: 95-ANE-01
- FR document: 96-7244
- Official PDF: https://openairdocs.org/files/sha256/d4/dc/d4dc3ec19b48205554bd858cd46bc1c2533c9259eb86a4fcaa3cad5f230bbcdb (from https://www.govinfo.gov/content/pkg/FR-1996-03-26/pdf/96-7244.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/03/26/96-7244/airworthiness-directives-alliedsignal-inc-al5512-series-turboshaft-engines
- Page: https://openairdocs.org/proposed/95-ANE-01

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to AlliedSignal, Inc. (formerly Textron Lycoming) AL5512 series turboshaft engines. This proposal would require a one-time eddy current inspection of the second stage turbine disk, reduced service lives for the second, third, and fourth stage turbine disks, reduced service lives for the first and third through seventh stage compressor rotor disks, and a reduced service life for the gas producer turbine spacer. This proposal would also require a new, more conservative minor cycle counting factors table for repetitive heavy lift operations, and provides a method for prorating past utilization for all gas producer and compressor components based on the new cycle counting factors. For those components that exceed their new published life limits, this proposal would implement a drawdown for safe removal of time-expired components. This proposal is prompted by reports of cracks in certain AlliedSignal, Inc. ALF502R series turbofan engine disks, which are identical in design and construction to those within the AlliedSignal, Inc. AL5512 series turboshaft engines. The actions specified by the proposed AD are intended to prevent disk failure, which could result in an uncontained engine failure, inflight shutdown, or possible damage to the rotorcraft.

## Notices in this docket

- Mar 26, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-7244, comments due May 28, 1996 (https://www.federalregister.gov/documents/1996/03/26/96-7244/airworthiness-directives-alliedsignal-inc-al5512-series-turboshaft-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.