# Proposed AD FAA-2005-21975: Boeing Model 727 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-23-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 29, 2005, 70 FR 43802
- Comments due: September 12, 2005
- Became: [AD 2005-23-07](https://openairdocs.org/ad/2005-23-07)
- Docket: FAA-2005-21975 (https://www.regulations.gov/docket/FAA-2005-21975, where comments are filed)
- Project: 2005-NM-122-AD
- FR document: 05-15016
- Official PDF: https://openairdocs.org/files/sha256/62/04/6204cd7243f4d898cd9b8706809b1ef4c8d2e47e3ee7bc128de292d81bbdcf2a (from https://www.govinfo.gov/content/pkg/FR-2005-07-29/pdf/05-15016.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/07/29/05-15016/airworthiness-directives-boeing-model-727-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1110F267F97968158625704D004B02D3.0001
- Page: https://openairdocs.org/proposed/FAA-2005-21975

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This proposed AD would require revising the Limitations section of the Airplane Flight Manual to prohibit resetting a tripped circuit breaker for a fuel pump. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prohibit the resetting of a tripped circuit breaker for a fuel pump, which could allow an electrical fault to override the protective features of the circuit breaker, and could result in sparks inside the fuel tank, ignition of fuel vapors, and consequent fire or explosion.

## Notices in this docket

- Jul 29, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-15016, comments due Sep 12, 2005 (https://www.federalregister.gov/documents/2005/07/29/05-15016/airworthiness-directives-boeing-model-727-airplanes)

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