Airworthiness Directive · Amendment 39-13739 · BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Series Airplanes
BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Series Airplanes
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.
This amendment adopts a new airworthiness directive (AD), applicable to certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ series airplanes, that requires replacing the existing bellows inlet duct of the auxiliary power unit (APU) system with a new, improved rectangular metallic bellows inlet duct. This action is necessary to prevent air from the 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. This action is intended to address the identified unsafe condition.
To prevent 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, accomplish the following:
(a) Within 24 months or 4,000 flight cycles after the effective date of this AD, whichever is first: Replace the existing rubber bellows inlet duct and sealing configuration of the APU system, with a new, improved rectangular metallic bellows inlet duct, which incorporates an improved seal and clamp configuration, per the Accomplishment Instructions of BAE Systems (Operations) Limited Modification Service Bulletin SB.49-036-36019E, Revision 4, dated April 30, 2003. Although the service bulletin specifies to submit certain information to the manufacturer, this AD does not include such a requirement.
(b) In accordance with 14 CFR 39.19, the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, is authorized to approve alternative methods of compliance for this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
