# Proposed AD FAA-2007-28160: Boeing Model 757-200 and 757-300 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-22-08
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: April 8, 2008, 73 FR 19015
- Comments due: May 5, 2008
- Became: [AD 2008-22-08](https://openairdocs.org/ad/2008-22-08)
- Docket: FAA-2007-28160 (https://www.regulations.gov/docket/FAA-2007-28160, where comments are filed)
- Project: 2007-NM-006-AD
- FR document: E8-7302
- Official PDF: https://openairdocs.org/files/sha256/e4/ef/e4ef6a56fb07a7f7a6bad63934926f6c81335337a38aea1054d019c55570757c (from https://www.govinfo.gov/content/pkg/FR-2008-04-08/pdf/E8-7302.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/04/08/E8-7302/airworthiness-directives-boeing-model-757-200-and-757-300-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B526C1EF14B744AB862574250047E45C.0001
- Page: https://openairdocs.org/proposed/FAA-2007-28160

## Summary

The FAA is revising an earlier proposed airworthiness directive (AD) for certain Boeing Model 757-200 and 757-300 series airplanes. The original NPRM would have required installing a bonding jumper between a ground and the clamp on the tube of the forward and aft gray water composite drain masts. The original NPRM resulted from a report of charred insulation blankets and burned wires around the forward gray water composite drain mast found during an inspection of the forward cargo compartment on a Model 767-300F airplane. For certain airplanes, this action revises the original NPRM by adding a new inspection of existing aft bonding jumper assemblies that might be too short, repair if necessary, and replacement of the bonding jumper assembly with a new, longer bonding jumper assembly if necessary. We are proposing this supplemental NPRM to prevent a fire near a composite drain mast and possible disruption of the electrical power system due to a lightning strike on a composite drain mast, which could result in the loss of several functions essential for safe flight.

## Notices in this docket

- May 16, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-9390, comments due Jul 2, 2007 (https://www.federalregister.gov/documents/2007/05/16/E7-9390/airworthiness-directives-boeing-model-757-200-and-757-300-series-airplanes)
- Apr 8, 2008: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document E8-7302, comments due May 5, 2008 (https://www.federalregister.gov/documents/2008/04/08/E8-7302/airworthiness-directives-boeing-model-757-200-and-757-300-series-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.