Airworthiness Directive · Amendment 39-16327 · Flight controls
Bombardier, Inc. Model DHC-8-400 Series Airplanes
This AD applies to Bombardier, Inc. Model DHC-8-400, DHC-8-401, and DHC-8-402 series airplanes, certificated in any category, serial numbers 4105 through 4179 inclusive.
We are adopting a new airworthiness directive (AD) for the
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Do the actions specified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD, as applicable.
(1) For airplanes having serial numbers 4105 through 4172 inclusive: Within 750 flight hours after the effective date of this AD, do a detailed inspection of the left-hand and right-hand spoiler unload valves having part number (P/N) 396000-1005 without suffix “A” after the serial number, for leaking and weeping, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009. For airplanes with left-hand and right-hand spoiler unload valves having P/N 396000-1005 with suffix “A” after the serial number, no further action is required by this paragraph.
(i) If any leaking or weeping is found, prior to further flight, replace the affected spoiler unload valve with a new or serviceable valve, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(ii) If no leaking and no weeping are found, replace the valves with new or serviceable valves within 6,000 flight hours after the initial inspection required by paragraph (g)(1) of this AD, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(2) For airplanes having serial numbers 4113 through 4179 inclusive: Within 750 flight hours after the effective date of this AD, do a detailed inspection of the left-hand and right-hand rudder shutoff valves having P/N 412700-1001 without suffix “A” after the serial number, for leaking and weeping, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009. For airplanes with left-hand and right-hand rudder shutoff valves having P/N 412700-1001 with suffix “A” after the serial number, no further action is required by this paragraph.
(i) If any leaking or weeping is found, prior to further flight, replace the affected rudder shutoff valve with a new or serviceable valve, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009.
(ii) If no leaking and no weeping are found, replace the valves with new or serviceable valves within 6,000 flight hours after the initial inspection required by paragraph (g)(2) of this AD, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009.
(3) As of the effective date of this AD, no person may install a spoiler unload valve assembly having P/N 396000-1005, having a serial number from 0289 through 0424 inclusive, or rudder shutoff valve having P/N 412700-1001, having a serial number from 0239 through 0384 inclusive, on any airplane, unless the valve has been inspected by the manufacturer and labeled with a suffix “A” after the serial number.
Note 1: This AD differs from the MCAI and/or service information as follows: No differences.
