# Airworthiness Directives; Hamilton Sundstrand Power Systems T-62T Series Auxiliary Power Units (APUs)
> **Rule** · Final rule. · Published 2004-11-26 · Effective 2005-01-03 · 69 FR 68767
## Document
- **Document number:** 04-25792
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 68767
- **Publication date:** 2004-11-26
- **Effective date:** 2005-01-03
- **FAA docket:** Docket No. 2003-NE-61-AD
## Abstract

The FAA is adopting 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 number (P/N) 4951627, 4951960, or 4952039, installed. This AD requires installation of a bracket to prevent a failed bypass button from protruding beyond the internal o-ring seal. This AD results from reports of leaks caused by cracked bypass buttons that protruded beyond the o-ring seal. We are issuing this AD to prevent a fire or explosion caused by a fuel leak from a failed bypass button on the fuel filter housing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/11/26/04-25792/airworthiness-directives-hamilton-sundstrand-power-systems-t-62t-series-auxiliary-power-units-apus)
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