Airworthiness directives › 2022-11-14
AD 2022-11-14 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, serial numbers 4001, 4003 and subsequent.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 500 flight hours or 3 months, whichever occurs first after the effective date of this AD: Lubricate the MLG assembly in accordance with paragraph 3.B.(2) of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-32-168, Revision A, dated February 8, 2022. Thereafter repeat the lubrication of the MLG assembly at intervals not to exceed 500 flight hours or 3 months, whichever occurs first.
Unsafe condition
This AD was prompted by reports that following a main landing gear (MLG) extension, one of the MLGs could not be locked in the gear down position due to deterioration of greasing effectiveness over time. An increase in friction within the MLG assembly (mechanism) could lead to failure to achieve an MLG down and locked condition. The FAA is issuing this AD to address this condition, which could result in a MLG collapse upon landing and consequently could cause the wing of the airplane to make contact with the ground and cause the airplane to flip.
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