Airworthiness directives › 2021-05-10
AD 2021-05-10 Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
Models named: BD-500-1A10, BD-500-1A11. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by a report that threaded fuel couplings were incorrectly installed at final assembly and in service. The FAA is issuing this AD to address loose fuel couplings, which could eventually disconnect and could lead to fuel starvation of the auxiliary power unit (APU) and pose a risk of fire.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1