Airworthiness Directive · Amendment 39-19363 · Landing gear
Bombardier, Inc., Airplanes
This AD applies to Bombardier, Inc., Model DHC-8-400, -401, and -402 airplanes, certificated in any category, serial numbers 4001, 4003 and subsequent.
We are superseding Airworthiness Directive (AD) 2014-05-28, which applied to certain Bombardier, Inc., Model DHC-8-400 series airplanes. AD 2014-05-28 required revising the maintenance or inspection program, as applicable. This AD requires revising the maintenance or inspection program, as applicable, to include a revised task. This AD was prompted by a determination that the interval from Maintenance Review Board (MRB) task number 323100-202 should not be escalated, and that Certification Maintenance Requirements (CMR) task number 323100-102 should be applicable to all Model DHC-8-400 series airplanes, regardless of which main landing gear (MLG) up-lock assembly is installed. We are issuing this AD to address the unsafe condition on these products.
Within 30 days after the effective date of this AD, revise the maintenance or inspection program, as applicable, to incorporate the information specified in Certification Maintenance Requirements (CMR) task number 323100-102 of Q400 Dash 8 (Bombardier) Temporary Revision (TR) ALI-0168, dated October 31, 2016 (“Bombardier TR ALI-0168”). The applicable maintenance or inspection program revision required by this paragraph may be done by inserting a copy of Bombardier TR ALI-0168, to Section 1-32, Landing Gear Maintenance Program, of Maintenance Review Board (MRB) Report Part 2, Bombardier Q400 Dash 8 Maintenance Requirements Manual, Product Support Manual (PSM) 1-84-7. When this temporary revision has been included in general revisions of the PSM, the general revisions may be inserted in the maintenance or inspection program, as applicable, provided the relevant information in the general revision is identical to that in Bombardier TR ALI-0168.
For MLG up-lock assembly latches that have accumulated flight cycles which exceed the CMR task number 323100-102 interval specified in Bombardier TR ALI-0168: Perform the initial CMR task number 323100-102 functional check as specified in Bombardier TR ALI-0168 using the applicable compliance time specified in paragraph (h)(1), (h)(2), or (h)(3) of this AD.
(1) For MLG up-lock assembly latches that have 14,200 total flight cycles or more as of the effective date of this AD: The compliance time for doing the initial functional check is within 800 flight cycles after the effective date of this AD.
(2) For MLG up-lock assembly latches that have 11,600 total flight cycles or more, but fewer than 14,200 total flight cycles, as of the effective date of this AD: The compliance time for doing the initial functional check is within 1,600 flight cycles after the effective date of this AD, but not to exceed 15,000 total flight cycles on the up-lock assembly latch.
(3) For MLG up-lock assembly latches with fewer than 11,600 total flight cycles as of the effective date of this AD: The compliance time for doing the initial functional check is within 3,000 flight cycles after the effective date of this AD, but not to exceed 13,200 total flight cycles on the up-lock assembly latch.
Accomplishing CMR task number 323100-102 of Bombardier TR MRB-66, dated December 7, 2011, to Section 1-32, Landing Gear Maintenance Program, of MRB Report Part 1, Bombardier Q400 Dash 8 Maintenance Requirements Manual, PSM 1-84-7, within 3,000 flight cycles before the effective date of this AD, is a method of compliance for the initial functional check required by CMR task number 323100-102 as specified in Bombardier TR ALI-0168.
