AD 2004-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Raytheon | Various | Airworthiness Directives; Raytheon (Beech) Model MU-300-10, 400, 400A, and 400T Series Airplanes; and Raytheon (Mitsubishi) Model Beech MU-300 Airplanes |
| aircraft | Mitsubishi | Various | Airworthiness Directives; Raytheon (Beech) Model MU-300-10, 400, 400A, and 400T Series Airplanes; and Raytheon (Mitsubishi) Model Beech MU-300 Airplanes |
Unsafe Condition
Fuel leaking from components in the spoiler mixer bay, leading to 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.
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Required Actions
Inspect spoiler mixer bay panels for drain holes and add at least one new drain hole, making a total of five as specified. Inspect sealant on the relief cutout on the aft pressure bulkhead and on certain baffles, and perform corrective actions if discrepancies are found.
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Compliance Time
Within 400 flight hours or 12 months after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Raytheon (Beech) Model MU-300-10, 400, 400A, and 400T series airplanes; and Raytheon (Mitsubishi) Model Beech MU-300 airplanes, certificated in any category, as listed in Raytheon Service Bulletin SB 53-3486, dated June 2003.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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