# Proposed AD FAA-2009-0908: The Boeing Company Model 757 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-06-06
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: January 3, 2011, 76 FR 28
- Comments due: January 28, 2011
- Became: [AD 2012-06-06](https://openairdocs.org/ad/2012-06-06)
- Docket: FAA-2009-0908 (https://www.regulations.gov/docket/FAA-2009-0908, where comments are filed)
- Project: 2009-NM-067-AD
- FR document: 2010-33129
- Official PDF: https://openairdocs.org/files/sha256/b5/61/b5610ce942a805936a6e00a4fff3cb34ca9b5b8e86ba9257bf6c1312eabbe917 (from https://www.govinfo.gov/content/pkg/FR-2011-01-03/pdf/2010-33129.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/01/03/2010-33129/airworthiness-directives-the-boeing-company-model-757-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/51ACB1EBB8E7CB368625780D00586FB9.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0908

## Summary

We are revising an earlier proposed airworthiness directive (AD) for the products listed above. That NPRM proposed replacing the power control relays for the fuel boost pumps and override pumps with new relays having a ground fault interrupt (GFI) feature. That NPRM was prompted by results from fuel system reviews conducted by the manufacturer. This action revises that NPRM for all airplanes by proposing to require an electrical bonding resistance measurement for certain GFI relays to verify that certain bonding requirements are met. This action also revises that NPRM by proposing to require, for certain airplanes, an inspection to ensure that certain screws are properly installed, and re-installing longer screws if necessary. We are proposing this supplemental NPRM to prevent damage to the fuel pumps caused by electrical arcing that could introduce an ignition source in the fuel tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion andconsequent loss of the airplane. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.

## Notices in this docket

- Oct 19, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-24987, comments due Dec 3, 2009 (https://www.federalregister.gov/documents/2009/10/19/E9-24987/airworthiness-directives-boeing-model-757-airplanes)
- Jan 3, 2011: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-33129, comments due Jan 28, 2011 (https://www.federalregister.gov/documents/2011/01/03/2010-33129/airworthiness-directives-the-boeing-company-model-757-airplanes)

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