Airworthiness Directive · Amendment 39-22064 · Landing gear
De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
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.
The FAA is adopting a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and - 402 airplanes. 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. This AD requires repetitive lubrication of the MLG assembly. The FAA is issuing this AD to address the unsafe condition on these products.
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.
