# Proposed AD 2003-NE-61-AD: Hamilton Sundstrand Power Systems T-62T Series Auxiliary Power Units (APUs)

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-24-03
- Products: Hamilton Sundstrand Power Systems
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 7, 2004, 69 FR 25525
- Comments due: July 6, 2004
- Became: [AD 2004-24-03](https://openairdocs.org/ad/2004-24-03)
- Docket: 2003-NE-61-AD
- FR document: 04-10430
- Official PDF: https://openairdocs.org/files/sha256/de/3c/de3c1f822cecd71f9d8b6c9bac79041b57636263b4ddc3f206f161b0b4c9ea36 (from https://www.govinfo.gov/content/pkg/FR-2004-05-07/pdf/04-10430.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/05/07/04-10430/airworthiness-directives-hamilton-sundstrand-power-systems-t-62t-series-auxiliary-power-units-apus
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0A647CC2CA7FE97886256E8D00576C66.0001
- Page: https://openairdocs.org/proposed/2003-NE-61-AD

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Hamilton Sundstrand Power Systems Models T-62T-46C12 and T-62T-40C14 (APS 500R) APUs with fuel filter housing assembly, part numbers (P/Ns) 4951627, 4951960, or 4952039, installed. This proposed AD would require installation of a bracket to prevent a failed bypass button from protruding beyond the internal o-ring seal. This proposed AD results from reports of leaks caused by cracked bypass buttons that protruded beyond the o-ring seal. We are proposing this AD to prevent a fire or explosion caused by a fuel leak from a failed bypass button on the fuel filter housing.

## Notices in this docket

- May 7, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-10430, comments due Jul 6, 2004 (https://www.federalregister.gov/documents/2004/05/07/04-10430/airworthiness-directives-hamilton-sundstrand-power-systems-t-62t-series-auxiliary-power-units-apus)

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