Airworthiness Directive · Amendment 39-15376 · :
Bombardier Model DHC-8-400 Series Airplanes
This AD applies to Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 airplanes; certificated in any category; having serial numbers 4001 and 4003 through 4102.
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) Within 1,000 flight hours after the effective date of this AD, perform a one-time inspection for damage of the spring support bracket and support beams of the forward baggage door, aft service door, and aft passenger door, as applicable, in accordance with Bombardier Service Bulletin 84-52-51, Revision A, dated September 8, 2006. Replace any damaged bracket, support beam, or doorstop in accordance with the service bulletin, prior to further flight.
(i) If any support beam is damaged at only one spring location and the damage is within the limits defined in Bombardier Repair Drawing RD 8/4-52-202, Issue 1, dated December 2, 2005, do the actions specified in paragraphs (f)(1)(i)(A) and (f)(1)(i)(B) of this AD.
(A) Inspect each doorstop of the affected door for integrity in accordance with the service bulletin prior to further flight, and repeat the inspection thereafter at intervals not to exceed 400 flight hours, until the support beam is repaired as specified in paragraph (f)(1)(i)(B) of this AD or replaced in accordance with the service bulletin. If the doorstop does not meet integrity standards during any inspection required by this paragraph, before further flight, repair or replace the doorstop with a new or serviceable doorstop in accordance with the repair drawing.
(B) Within 5,000 flight hours after accomplishing the inspection described in paragraph (f)(1) of this AD, repair the support beam in accordance with the repair drawing or replace in accordance with the service bulletin. Doing the repair or replacement terminates the inspections required by paragraph (f)(1)(i)(A) of this AD.
(ii) If any support beam is damaged at one or two spring locations and any damage exceeds the limits defined in Bombardier Repair Drawing RD 8/4-52-202, Issue 1, dated December 2, 2005, prior to further flight, replace the damaged support beam with a new support beam in accordance with the service bulletin.
(iii) If any support beam is damaged at two spring locations and the damage is within the limits defined in Bombardier Repair Drawing RD 8/4-52-202, Issue 1, dated December 2, 2005, prior to further flight, repair the support beam in accordance with the repair drawing.
(2) Within 1,000 flight hours after the effective date of this AD, remove the nuts and washers at the bottom of the over-centering spring assemblies of the forward baggage door, aft service door, and aft passenger door by incorporating Modsum 4-155296, in accordance with Bombardier Service Bulletin 84-52-51, Revision A, dated September 8, 2006.
Note: This AD differs from the MCAI and/or service information as follows: No differences.
