# Airworthiness Directives; Boeing Model 727 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-06-23 · Effective 1999-06-28 · 64 FR 33394
## Document
- **Document number:** 99-15775
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 727 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 33394
- **Publication date:** 1999-06-23
- **Effective date:** 1999-06-28
- **FAA docket:** Docket No. 99-NM-121-AD
## Abstract

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) T99-12-52 that was sent previously to all known U.S. owners and operators of all Boeing Model 727 series airplanes by individual telegrams. This AD requires a boost pump dry bay inspection to detect leakage of fuel through an arced- through conduit, and corrective action, as necessary. This AD also requires repetitive detailed visual inspections of the in-tank fuel boost pump wiring to detect chafing of the wire insulation, evidence of electrical arcing, or arc-through of the conduit wall on Model 727 series airplanes, and applicable corrective action; and installation of sleeving over the in-tank fuel boost pump wires as a method to protect the wiring from chafing. This action is prompted by reports of severe wear of in-tank fuel boost pump wiring, and arc-through of the surrounding conduit on two Model 727 series airplanes. The actions specified by this AD are intended to prevent fuel tank explosion resulting from arc-through of the fuel boost pump wiring conduits.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/06/23/99-15775/airworthiness-directives-boeing-model-727-series-airplanes)
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