# Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes Modified In Accordance With Supplemental Type Certificate (STC) ST00127BO
> **Rule** · Final rule. · Published 2005-03-14 · Effective 2005-04-18 · 70 FR 12401
## Document
- **Document number:** 05-4827
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 12401
- **Publication date:** 2005-03-14
- **Effective date:** 2005-04-18
- **FAA docket:** Docket No. FAA-2004-19891
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Boeing Model 737-300, -400, and -500 series airplanes modified in accordance with STC ST00127BO. This AD requires installation of bonding straps to the safe side harnesses of the digital transient suppression device of the fuel quantity indicating system. This AD is prompted by the results of fuel system reviews conducted by the STC holder. We are issuing 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/03/14/05-4827/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes-modified-in-accordance)
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