Airworthiness Directive · Amendment 39-16768 · Landing gear
Bombardier, Inc. Model DHC-8-400 Series Airplanes
Superseded. A later AD replaced this one: AD 2012-20-09. Comply with the one in force.
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category, having serial numbers 4001 through 4247 inclusive.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 2,000 flight hours after the effective date of this AD: Incorporate Bombardier Modsum 4-113645, including performing a detailed visual inspection for damage or cracks of the bumper plate and base fitting and replacing any damaged or cracked part, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-32-74, Revision A, dated May 17, 2010. Do all applicable replacements before further flight.
(h) For airplanes on which a bumper plate having part number 85424082-101 or 85424082-103 is installed that has been reworked in accordance with Bombardier Repair Drawing 8/4-54-553: Within 1,000 flight hours after the effective date of this AD, reidentify the bumper plate, in accordance with paragraph 3.B., step (8) of the Accomplishment Instructions of Bombardier Service Bulletin 84-32-74, Revision A, dated May 17, 2010.
Note 1: Bombardier Service Bulletin 84-32-74, Revision A, dated May 17, 2010, includes an operational check of the alternate extension system of the MLG. If the check fails, guidance on doing corrective actions can be found in the Bombardier Q400 Dash 8 Aircraft Maintenance Manual.
(i) Incorporation of Bombardier Modsum 4-113645 before the effective date of this AD in accordance with Bombardier Service Bulletin 84-32-74, dated December 23, 2009, is considered acceptable for compliance with the modification in paragraph (h) of this AD, provided the action in paragraph (h) of this AD is done within the compliance time specified in paragraph (h) of this AD.
Note 2: This AD differs from the MCAI and/or service information as follows: No differences.
