Airworthiness Directive · Amendment 39-22389 · 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 an investigation of incorrectly manufactured sleeves that were potentially installed in the main landing gear (MLG) forward door linkage assembly. This AD requires review of technical records and inspections to determine if a discrepant sleeve is installed, replacement of any discrepant sleeve and re-identification of the MLG forward door linkage assembly. This AD also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
Within 30 days after the effective date of this AD, review the airplane records to determine whether any sleeve P/N 46878-1 was replaced after October 29, 2019, on any MLG forward door linkage assembly P/N 46860.
(1) For any sleeve P/N 46878-1 that was replaced after October 29, 2019, and for any sleeve for which its replacement date cannot be conclusively determined from the records: Within 1,500 flight cycles after the effective date of this AD, do the actions specified in paragraphs (g)(1)(i) and (ii) of this AD, in accordance with Section 3.B. of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-32-169, Revision A, dated July 21, 2022, including Collins Aerospace Service Bulletin 46860-32-150, Revision 1, dated June 28, 2022.
(i) Do a general visual inspection of the sleeve for the presence of lubrication grooves, and before further flight replace any sleeve that does not have lubrication grooves.
(ii) Do a general visual inspection of the MLG forward door linkage assemblies (swivel link, clevis assembly, and swivel end assembly) for damage, deformation, erosion, and corrosion, and before further flight repair or replace the discrepant parts.
(2) If the records confirm that no maintenance was performed on the MLG forward door linkage assembly P/N 46860 after October 29, 2019, no further action is required by this paragraph.
