# Proposed AD FAA-2008-0640: Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-21-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 18, 2008, 73 FR 34663
- Comments due: August 4, 2008
- Became: [AD 2008-21-06](https://openairdocs.org/ad/2008-21-06)
- Docket: FAA-2008-0640 (https://www.regulations.gov/docket/FAA-2008-0640, where comments are filed)
- Project: 2008-NM-070-AD
- FR document: E8-13714
- Official PDF: https://openairdocs.org/files/sha256/b7/a7/b7a7d6c5a36d0e2fa3f059ea3c7bbaa18c116f4ceb7918b91c1b3e5dd8f1b833 (from https://www.govinfo.gov/content/pkg/FR-2008-06-18/pdf/E8-13714.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/06/18/E8-13714/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/65BA56ABC4AF99AC8625746C006D2881.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0640

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. This proposed AD would require installing an extension tube to the existing pump discharge port of the scavenge pump on the outboard side of the center fuel tank in the main fuel tank 2. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent a fire or explosion in the fuel tank and consequent loss of the airplane.

## Notices in this docket

- Jun 18, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-13714, comments due Aug 4, 2008 (https://www.federalregister.gov/documents/2008/06/18/E8-13714/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes)

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