Airworthiness Directive · Amendment 39-14112 · Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 Airplanes
Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 Airplanes
This AD applies to Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 airplanes, certificated in any category; serial numbers 003 through 593 inclusive.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311 and -315 airplanes. This AD requires installation of check valves in Numbers 1 and 2 hydraulic systems, removal of the filters from the brake shuttle valves, and removal of the internal garter spring from the brake shuttle valves. This AD results from two instances of brake failure due to the loss of hydraulic fluid from both Numbers 1 and 2 hydraulic systems and one incident of brake failure due to filter blockage in the shuttle valve. We are issuing this AD to prevent the loss of hydraulic power from both hydraulic systems, which could lead to reduced controllability of the airplane, and to prevent brake failure, which could result in the loss of directional control on the ground and consequent departure from the runway during landing.
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 12 months after the effective date of this AD, install check valves in the Numbers 1 and 2 hydraulic return systems by incorporating Modsum 8Q101320 in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-29-36, Revision “B,” dated January 6, 2003.
Within 12 months after the effective date of this AD, modify the brake shuttle valves, part number (P/N) 5084-1, by doing the actions in either paragraph (g)(1) or (g)(2) of this AD. The installation specified in paragraph (f) of this AD must be done prior to doing any actions in accordance with Bombardier Service Bulletin 8-29-37, Revision “A,” dated September 19, 2003 (Modsum 8Q101316), that are specified in paragraphs (g)(1) and (g)(2) of this AD.
(1) Remove the filter assemblies by incorporating Modsum 8Q101422 in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-29-39, dated July 14, 2003; and within 40,000 flight hours after removing the filter assemblies, remove the internal garter spring by incorporating Modsum 8Q101316 in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-29-37, Revision “A,” dated September 19, 2003.
(2) Remove the filter assemblies and internal garter spring by incorporating Modsum 8Q101316 in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-29-37, Revision “A,” dated September 19, 2003.
Note 1: You can mix shuttle valves that have incorporated either Modsum 8Q101316 or 8Q101422 on the same airplane.
Installations accomplished before the effective date of this AD according to Bombardier Service Bulletin 8-29-36, dated December 6, 2002; and Revision “A,” dated December 12, 2002, are considered acceptable for compliance with the corresponding installation specified in paragraph (f) of this AD.
(i) Removals of the filters and internal garter springs accomplished before the effective date of this AD according to Bombardier Service Bulletin 8-29-37, dated July 15, 2003, are considered acceptable for compliance with the corresponding removals specified in paragraph (g) of this AD.
