Airworthiness directives › 2023-16-05
AD 2023-16-05 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Models named: DHC-8-401, -402. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to De Havilland Aircraft of Canada Limited (type certificate previously held by Bombardier, Inc.) Model DHC-8-401 and -402 airplanes, certificated in any category, having serial numbers 4001 and 4003 through 4633 inclusive.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 2,400 flight hours or 12 months, whichever occurs first, after the effective date of this AD, do a one-time general visual inspection for discrepancies on the left and right MLG spring box assemblies (part number (P/N) 48504-1), in accordance with Section 3.B., Part A, of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-32-159, dated June 28, 2019. If any discrepancy is discovered in the spring box assembly, before further flight, replace with a new spring box assembly, in accordance with Section 3.B. Part B, of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-32-159, dated June 28, 2019.
Unsafe condition
This AD was prompted by reports of the main landing gear (MLG) aft door not opening when using the alternate extension system. The FAA is issuing this AD to address possible cam assembly, spring box assembly, and alternate release cable assembly failures. The unsafe condition, if not addressed, could result in asymmetric MLG configuration at landing, and a runway excursion.
Affected ADs
None.
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