AD 2004-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell | Various | Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Series Airplanes |
Unsafe Condition
Air from the auxiliary power unit (APU) bay being ingested into the flight deck and passenger cabin, resulting in poor air quality and, if the air is contaminated, possible incapacitation of the flightcrew and passengers.
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Required Actions
Replace the existing rubber bellows inlet duct and sealing configuration of the APU system with a new, improved rectangular metallic bellows inlet duct, incorporating an improved seal and clamp configuration, per BAE Systems (Operations) Limited Modification Service Bulletin SB.49-036-36019E, Revision 4, dated April 30, 2003.
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Compliance Time
Within 24 months or 4,000 flight cycles after the effective date of this AD, whichever is first.
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Affected Aircraft
Model 146 series airplanes with Modification HCM30027A, HCM36019A, or HCM30373A installed; and Model Avro 146-RJ series airplanes with Modification HCM36019A or HCM30373A installed, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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