Airworthiness directives › 2021-20-07
AD 2021-20-07 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 the Airbus Canada Limited Partnership (type certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) airplanes identified in paragraphs (c)(1) and (2) of this AD, certificated in any category. (1) Model BD-500-1A10 airplanes, having serial number (S/N) 50001 through 50018 inclusive, and 50020 through 50055 inclusive. (2) Model BD-500-1A11 airplanes, having S/N 55001 through 55016 inclusive, 55018 through 55068 inclusive, 55070 through 55083 inclusive, 55086 through 55088 inclusive, and 55090.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 12 months after the effective date of this AD, replace the forward galley slotted drain covers with solid blanking plates and modify the associated drain tubing to block water, in accordance with paragraph 2, “Procedure,” of the Accomplishment Instructions of Airbus Canada Limited Partnership Service Bulletin BD500-530009, Issue 001, dated July 31, 2020.
Unsafe condition
This AD was prompted by a report that following an in-service engine shutdown during taxi, water was found dripping into the forward avionics bay; the water caused a short circuit and tripped a circuit breaker. The FAA is issuing this AD to address water ingress into the forward avionics bay, which could short circuit the equipment in the bay area and lead to a loss of air data sources and consequent reduced functional capabilities and increase in crew workload, possibly leading to a loss of continued safe flight and landing.
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