# Proposed AD FAA-2012-0187: the Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-07-07
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: February 23, 2015, 80 FR 9400
- Comments due: April 24, 2015
- Became: [AD 2016-07-07](https://openairdocs.org/ad/2016-07-07)
- Docket: FAA-2012-0187 (https://www.regulations.gov/docket/FAA-2012-0187, where comments are filed)
- Project: 2011-NM-094-AD
- FR document: 2015-03540
- Official PDF: https://openairdocs.org/files/sha256/2b/e3/2be3cf98a43da1cee5067c192a27c007dd5e843ab49e308b449d3eb6464863ff (from https://www.govinfo.gov/content/pkg/FR-2015-02-23/pdf/2015-03540.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/02/23/2015-03540/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/584A3AC323E814FF86257DF5004E40C2.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0187

## Summary

We are revising an earlier proposed airworthiness directive (AD) for certain The Boeing Company Model 757 airplanes. The NPRM proposed to require modifying the fuel quantity indication system (FQIS) wiring or fuel tank systems to prevent development of an ignition source inside the center fuel tank. The NPRM was prompted by fuel system reviews conducted by the manufacturer. This action revises the NPRM by revising the applicability, including optional actions for cargo airplanes, and extending the compliance time. We are proposing this supplemental NPRM (SNPRM) to prevent ignition sources inside the center fuel tank, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane. Since these actions significantly change the corrective action options for cargo airplanes relative to the proposal in the NPRM, and because the cost estimate is significantly revised, we are reopening the comment period to allow the public the chance to comment on these proposed changes.

## Notices in this docket

- Mar 1, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-4931, comments due Apr 30, 2012 (https://www.federalregister.gov/documents/2012/03/01/2012-4931/airworthiness-directives-the-boeing-company-airplanes)
- Jun 5, 2012: Notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2012-13556, comments due Aug 6, 2012 (https://www.federalregister.gov/documents/2012/06/05/2012-13556/airworthiness-directives-the-boeing-company-airplanes)
- Feb 23, 2015: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2015-03540, comments due Apr 24, 2015 (https://www.federalregister.gov/documents/2015/02/23/2015-03540/airworthiness-directives-the-boeing-company-airplanes)

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