Airworthiness Directive · Amendment 39-15674 · Flight controls
Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 Airplanes
Bombardier Model DHC-8-400, DHC-8-401 and DHC-8-402 airplanes, serial numbers 4003, 4004, 4006, and 4008 through 4129, certificated in any category.
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:
Unless already done, do the following actions.
(1) For airplanes with serial numbers 4003, 4004, 4006, and 4008 through 4094: Within 6,000 flight hours after the effective date of this AD, modify the spoiler cable disconnect sensing circuit by incorporating Modsum 4-110066 in accordance with Bombardier Service Bulletin 84-27-33, dated June 6, 2007.
(2) For airplanes with serial numbers 4095 through 4129: Within 6,000 flight hours after the effective date of this AD, modify the spoiler cable disconnect sensing circuit by incorporating Modsum 4-126356 in accordance with Bombardier Service Bulletin 84-27-28, Revision B, dated September 25, 2007.
(3) Installations of Modsum 4-126356 accomplished before the effective date of this AD according to Bombardier Service Bulletin 84-27-28, dated October 2, 2006; or Revision A, dated April 30, 2007; are considered acceptable for compliance with the corresponding action specified in this AD.
Note: This AD differs from the MCAI and/or service information as follows: No differences.
