# Airworthiness Directives; Boeing Model 707 Airplanes, and Boeing Model 720 and 720B Series Airplanes
> **Rule** · Final rule. · Published 2005-09-27 · Effective 2005-11-01 · 70 FR 56349
## Document
- **Document number:** 05-19140
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 707
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 56349
- **Publication date:** 2005-09-27
- **Effective date:** 2005-11-01
- **FAA docket:** Docket No. FAA-2005-20785
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 707 airplanes, and all Boeing Model 720 and 720B series airplanes. This AD requires revising the Limitations section of the airplane flight manual (AFM). The AFM revisions include instructions for monitoring the low pressure lights for the center tank fuel pumps, and a statement prohibiting the resetting of a tripped circuit breaker for a fuel pump in any tank. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent dry operation of the fuel pumps in the center fuel tank, which could result in high temperatures or sparks inside the fuel tank, ignition of fuel vapors, and consequent fire or explosion. We are also issuing this AD to prohibit the resetting of a tripped circuit breaker for a fuel pump in any tank, which could allow an electrical fault to override the protective features of the circuit breaker, and result in sparks inside the fuel tank, ignition of fuel vapors, and consequent fire or explosion.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/09/27/05-19140/airworthiness-directives-boeing-model-707-airplanes-and-boeing-model-720-and-720b-series-airplanes)
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