Airworthiness Directive · Amendment 39-14142 · BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Airplanes
BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Airplanes
This AD applies to BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes, certificated in any category, on which BAE Systems Modification HCM30373A, or BAE Systems Modification HCM30373A and HCM36166C, are installed.
The FAA is adopting a new airworthiness directive (AD) for certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes. This AD requires modifying the auxiliary power unit (APU) exhaust duct in the environmental control system (ECS) bay; installing new, improved insulation on this APU exhaust duct; and replacing the existing drain pipe with a new exhaust drain pipe blank. This AD is prompted by a determination that the temperature of the skin of the APU exhaust duct in the ECS bay is higher than the certificated maximum temperature for this area. We are issuing this AD to prevent the potential for ignition of fuel or hydraulic fluid, which could leak from pipes running through the ECS bay. Ignition of these flammable fluids could result in a fire in the ECS bay.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 6 months after the effective date of this AD: Modify the APU exhaust duct in the ECS bay; install new, improved insulation on this APU exhaust duct; and replace the existing drain pipe with a new exhaust drain pipe blank; by doing all of the actions in the Accomplishment Instructions of BAE Systems (Operations) Limited Modification Service Bulletin SB.49-072-36244A, dated October 11, 2004. Where the Accomplishment Instructions of the service bulletin specify submitting an Advice Note to the manufacturer, this AD does not require that action.
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
