Airworthiness Directive · Amendment 39-14410 · Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR Airplanes; and Model EMB-145, 145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR Airplanes; and Model EMB-145, 145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
This AD applies to EMBRAER Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes; certificated in any category; equipped with Model C-14 auxiliary power units (APUs); except those airplanes with serial numbers 14500927 and subsequent.
The FAA is adopting a new airworthiness directive (AD) for certain EMBRAER airplanes listed above. This AD requires modifying the drain system of the auxiliary power unit (APU) by installing a scavenge pump and, for certain airplanes, replacing the APU exhaust assembly. This AD results from a report of fuel leaking from the APU feeding line and accumulating inside the APU compartment because the drain system is inadequate when the APU is running. We are issuing this AD to prevent fuel accumulation and subsequent flammable fuel vapors in the APU cowling, which, combined with an ignition source, could result in a fire or explosion.
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 5,000 flight hours after the effective date of this AD, modify the APU compartment drain system by installing a scavenge pump on it by doing all actions specified in the Accomplishment Instructions of EMBRAER Service Bulletin 145LEG-49-0006 (for Model EMB-135BJ airplanes), dated April 20, 2005; or 145-49-0029 (for all remaining airplanes), Revision 02, dated October 14, 2005. A modification before the effective date of this AD in accordance with EMBRAER Service Bulletin 145-49-0029, dated April 20, 2005; or Revision 01, dated July 13, 2005, is also acceptable for compliance with the requirements of this paragraph, as applicable.
For airplanes with an APU cowling part number 145-52979-401 or 145-52979-403: Before or concurrently with the pump drain installation required by paragraph (f) of this AD, replace the APU exhaust assembly by doing all actions specified in the Accomplishment Instructions of EMBRAER Service Bulletin 145-49-0023, Revision 01, dated April 25, 2005. Replacement before the effective date of this AD in accordance with EMBRAER Service Bulletin 145-49-0023, dated November 23, 2004, is also acceptable for compliance with the requirements of this paragraph.
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.
