# Proposed AD FAA-2004-18660: Raytheon (Beech) Model MU-300-10, 400, 400A, and 400T Series Airplanes; and Raytheon (Mitsubishi) Model Beech MU-300 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-22-02
- Products: Raytheon
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 22, 2004, 69 FR 43783
- Comments due: September 7, 2004
- Became: [AD 2004-22-02](https://openairdocs.org/ad/2004-22-02)
- Docket: FAA-2004-18660 (https://www.regulations.gov/docket/FAA-2004-18660, where comments are filed)
- Project: 2003-NM-161-AD
- FR document: 04-16684
- Official PDF: https://openairdocs.org/files/sha256/00/18/00188b42e70f9a737c13c3b3426eb2dbc76a0b4ef60ec588e8619c10307f9906 (from https://www.govinfo.gov/content/pkg/FR-2004-07-22/pdf/04-16684.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/07/22/04-16684/airworthiness-directives-raytheon-beech-model-mu-300-10-400-400a-and-400t-series-airplanes-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8B74F3C880680EA186256ED9005221E6.0001
- Page: https://openairdocs.org/proposed/FAA-2004-18660

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Raytheon (Beech) Model MU-300-10, 400, 400A, and 400T series airplanes; and certain Raytheon (Mitsubishi) Model Beech MU-300 airplanes. This proposed AD would require a one-time inspection of certain panels in the spoiler mixer bay for the presence of drain holes, and the addition of at least one new drain hole; and a one-time inspection for discrepancies of the sealant on the relief cutout on the aft pressure bulkhead, and on certain baffles; and corrective actions if necessary. This proposed AD is prompted by a report of fuel leaking from components in the spoiler mixer bay of several Raytheon (Beech) Model 400A series airplanes. We are proposing this AD to prevent the accumulation of fuel and/or fuel vapor in the spoiler mixer bay and/or the aft fuselage compartment, which could result in a fire in the airplane.

## Notices in this docket

- Jul 22, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-16684, comments due Sep 7, 2004 (https://www.federalregister.gov/documents/2004/07/22/04-16684/airworthiness-directives-raytheon-beech-model-mu-300-10-400-400a-and-400t-series-airplanes-and)

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