# Proposed AD FAA-2008-1207: Honeywell International Inc. ALF502L-2 and ALF502L-2C Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-08-07
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 28, 2008, 73 FR 72370
- Comments due: January 27, 2009
- Became: [AD 2009-08-07](https://openairdocs.org/ad/2009-08-07)
- Docket: FAA-2008-1207 (https://www.regulations.gov/docket/FAA-2008-1207, where comments are filed)
- Project: 2007-NE-47-AD
- FR document: E8-28269
- Official PDF: https://openairdocs.org/files/sha256/bf/24/bf2441796a8a0816642e38eb7627b24e4983316c1cacdb6258034af9e5d305c0 (from https://www.govinfo.gov/content/pkg/FR-2008-11-28/pdf/E8-28269.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/11/28/E8-28269/airworthiness-directives-honeywell-international-inc-alf502l-2-and-alf502l-2c-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CAD005CBB219AFAF8625750F0057D386.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1207

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. ALF502L-2 and ALF502L-2C turbofan engines with certain high-pressure compressor (HPC) first stage discs installed. This proposed AD would require performing a dimensional inspection to determine if excessive disc balance material was removed and a magnetic particle inspection if the disc passes the dimensional inspection. This proposed AD results from reports of discs found with excessive material removed from the balancing material of the disc. We are proposing this AD to prevent the discs from fracturing before reaching the currently published life limit. A disc fracture could result in an uncontained failure of the disc and damage to the airplane.

## Notices in this docket

- Nov 28, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-28269, comments due Jan 27, 2009 (https://www.federalregister.gov/documents/2008/11/28/E8-28269/airworthiness-directives-honeywell-international-inc-alf502l-2-and-alf502l-2c-turbofan-engines)

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