# Proposed AD FAA-2004-19891: Boeing Model 737-300, -400, and -500 Series Airplanes Modified in Accordance With Supplemental Type Certificate (STC) ST00127BO

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-05-17
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 16, 2004, 69 FR 75280
- Comments due: January 31, 2005
- Became: [AD 2005-05-17](https://openairdocs.org/ad/2005-05-17)
- Docket: FAA-2004-19891 (https://www.regulations.gov/docket/FAA-2004-19891, where comments are filed)
- Project: 2004-NM-136-AD
- FR document: 04-27519
- Official PDF: https://openairdocs.org/files/sha256/c5/ee/c5ee5589890dd3614058c1e57ec1bd87f715bc25cf4c158f0d6961274e893a8f (from https://www.govinfo.gov/content/pkg/FR-2004-12-16/pdf/04-27519.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/12/16/04-27519/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes-modified-in-accordance
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BAE7F8C30C3B319686256F6C005CF37E.0001
- Page: https://openairdocs.org/proposed/FAA-2004-19891

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Boeing Model 737-300, -400, and -500 series airplanes modified in accordance with STC ST00127BO. This proposed AD would require installation of bonding straps to the safe side harnesses of the digital transient suppression device of the fuel quantity indicating system. This proposed AD is prompted by the results of fuel system reviews conducted by the STC holder. We are proposing this AD to prevent unsafe levels of current or energy from entering the fuel tank, due to hot short faults or threat conditions associated with the safe side harness assembly, which could result in a fire or explosion of the fuel tank.

## Notices in this docket

- Dec 16, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-27519, comments due Jan 31, 2005 (https://www.federalregister.gov/documents/2004/12/16/04-27519/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes-modified-in-accordance)

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