Airworthiness Directive · Amendment 39-19702 · Wings
Bombardier, Inc., Airplanes
This AD applies to Bombardier, Inc., Model DHC-8-400, -401, and -402 airplanes, certificated in any category, serial numbers (S/Ns) 4001 through 4547 inclusive, having outboard spoiler actuator mounting brackets with part numbers (P/Ns) 85714052-101 or 85714052-102.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model DHC-8-400 series airplanes. This AD was prompted by a report of a cracked outboard spoiler actuator mounting bracket. This AD requires repetitive inspections of the outboard spoiler actuator mounting brackets, replacement of any cracked bracket, and eventual replacement of all brackets with a re-designed part that would terminate the repetitive inspections. The FAA is issuing this AD to address the unsafe condition on these products.
At the applicable time specified in paragraph (g)(1) or (g)(2) of this AD: Do a general visual inspection for cracks in the left and right outboard spoiler actuator mounting brackets having P/N 85714052-101 or 85714052-102 (belonging to assemblies having P/N 85714018-001 or P/N 85714018-002, respectively), in accordance with Section 3.B, Part A, of the Accomplishment Instructions of Bombardier Service Bulletin 84-27-72, Revision A, dated November 9, 2017. Repeat the inspection thereafter at intervals not to exceed 8,000 flight hours.
(1) For airplanes having less than 12,000 total flight hours as of the effective date of this AD: Prior to the accumulation of 18,000 total flight hours.
(2) For airplanes having 12,000 total flight hours or more as of the effective date of this AD: Within 6,000 flight hours after the effective date of this AD.
(1) If, during any inspection required by paragraph (g) of this AD, either the left or right outboard spoiler actuator mounting bracket is found cracked: Before further flight, replace both the left and right brackets with new bracket assemblies having P/N 85714018-003 or P/N 85714018-004, including doing all applicable related investigative actions and corrective actions, in accordance with Section 3.B, Part B, of the Accomplishment Instructions of Bombardier Service Bulletin 84-27-72, Revision A, dated November 9, 2017; except, where the service information specifies contacting Bombardier for corrective action, this AD requires accomplishing the action using a method approved by the Manager, New York ACO Branch, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
(2) If, during any inspection required by paragraph (g) of this AD, no cracking is found on the left and right outboard spoiler actuator mounting brackets, and the left and right outboard spoiler actuator mounting brackets have not already been replaced per the requirements of paragraph (h)(1) of this AD: Replace both the left and right brackets with new bracket assemblies having P/N 85714018-003 or P/N 85714018-004, including doing all applicable related investigative actions and corrective actions, at the applicable time specified in paragraph (h)(2)(i) or (h)(2)(ii) of this AD, in accordance with Section 3.B, Part B, of the Accomplishment Instructions of Bombardier Service Bulletin 84-27-72, Revision A, dated November 9, 2017; except, where the service information specifies contacting Bombardier for corrective action, this AD requires accomplishing the action using a method approved by the Manager, New York ACO Branch, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO. If approved by the DAO, the approval must include the DAO-authorized signature. Related investigative and corrective actions must be done before further flight.
(i) For airplanes that have accumulated less than 34,000 total flight hours as of the effective date of this AD: Replace the outboard spoiler actuator mounting brackets prior to the airplane accumulating 40,000 total flight hours.
(ii) For airplanes that have accumulated 34,000 total flight hours or more as of the effective date of this AD: Replace the outboard spoiler actuator mounting brackets within 6,000 flight hours after the effective date of this AD.
Replacement of an outboard spoiler actuator mounting bracket, in accordance with the requirements of paragraph (h) of this AD, is terminating action for the repetitive inspections required by paragraph (g) of this AD for the replaced bracket.
