Airworthiness Directive · Amendment 39-21453 · Fuel
Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
This AD applies to Airbus Canada Limited Partnership (type certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) airplanes, certificated in any category, as identified in paragraphs (c)(1) and (2) of this AD.
(1) Model BD-500-1A10 airplanes, serial numbers 50010 through 50018 inclusive, and 50020 through 50041 inclusive.
(2) Model BD-500-1A11 airplanes, serial numbers 55003 through 55016 inclusive, 55018 through 55054 inclusive, and 55056.
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by a report that threaded fuel couplings were incorrectly installed at final assembly and in service. This AD requires repetitive functional tests of the auxiliary power unit (APU) fuel feed line shroud, a general visual inspection of the APU fuel feed line shroud for any loose couplings; and tightening any loose couplings, which would terminate the repetitive functional tests. The FAA is issuing this AD to address the unsafe condition on these products.
Within 4,000 flight hours after the effective date of this AD, do an initial functional test of the APU fuel feed line shroud, in accordance with Part A of the Accomplishment Instructions of Airbus Canada Service Bulletin BD500-282009, Issue 003, dated August 14, 2020. Thereafter, repeat the functional test at intervals not to exceed 4,000 flight hours. If any functional test reveals a leak, before further flight, do the applicable actions specified in paragraph (h) of this AD.
(1) Except as required by paragraph (g) of this AD: Within 9,350 flight hours or 56 months, whichever occurs first after the effective date of this AD: Do a general visual inspection of the APU fuel feed line shroud for any loose couplings, and tighten any loose couplings as applicable, in accordance with Part B of the Accomplishment Instructions of Airbus Canada Service Bulletin BD500-282009, Issue 003, dated August 14, 2020.
(2) For airplanes on which the inspection and tightening of the APU fuel feed line shroud couplings was done before the effective date of this AD, using Part B of the Accomplishment Instructions of Airbus Canada Service Bulletin BD500-282009, Issue 001, dated December 13, 2019: Within 9,350 flight hours or 56 months, whichever occurs first after the effective date of this AD, do a general visual inspection of the APU feed line shroud for any loose couplings between frame (FR) 63 and FR 80, and tighten any loose couplings as applicable, in accordance with Part C of the Accomplishment Instructions of Airbus Canada Service Bulletin BD500-282009, Issue 003, dated August 14, 2020.
The inspection and tightening of the APU fuel feed line shroud couplings as specified in paragraph (h) of this AD terminate the initial and repetitive functional tests of the APU fuel feed line shroud specified in paragraph (g) of 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.
