# Proposed AD FAA-2008-1065: Boeing Model 727 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-05-03
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 7, 2008, 73 FR 58509
- Comments due: November 21, 2008
- Became: [AD 2009-05-03](https://openairdocs.org/ad/2009-05-03)
- Docket: FAA-2008-1065 (https://www.regulations.gov/docket/FAA-2008-1065, where comments are filed)
- Project: 2008-NM-126-AD
- FR document: E8-23668
- Official PDF: https://openairdocs.org/files/sha256/68/1f/681ff3dc1f453e7ef30b7b84e5ef308885141a4d1a46ac7730640d07231c823c (from https://www.govinfo.gov/content/pkg/FR-2008-10-07/pdf/E8-23668.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/10/07/E8-23668/airworthiness-directives-boeing-model-727-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A1E3B0394BBD05F5862574DB004BBC10.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1065

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 727 airplanes. This proposed AD would require, among other actions, installing new ground fault interrupter (GFI) relays for the main fuel tanks and the auxiliary fuel tank pumps. This proposed AD also would require revising the FAA-approved maintenance program to incorporate new Airworthiness Limitations (AWLs) for the GFI of the boost pumps and for the uncommanded on system for the auxiliary fuel tank pumps. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent an electrical fault in the fuel pump system, which might cause a connector or end cap to burn through and a subsequent fire or explosion inside the fuel pump or wing spar area. We are also proposing this AD to prevent uncommanded operation of the auxiliary fuel tank pumps, which can cause them to run dry. This condition will increase pump temperature and could supply an ignition source to fumes in the fuel tank, which can result in a consequent fire or explosion.

## Notices in this docket

- Oct 7, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-23668, comments due Nov 21, 2008 (https://www.federalregister.gov/documents/2008/10/07/E8-23668/airworthiness-directives-boeing-model-727-airplanes)

---
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.