Airworthiness Directive · Amendment 39-16797 · Wings
Bombardier, Inc. Model DHC-8-400 Series Airplanes
Superseded. A later AD replaced this one: AD 2019-20-09. Comply with the one in force.
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category, serial numbers 4001 and subsequent.
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:
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
At the applicable time specified in paragraph (g)(1) or (g)(2) of this AD: Do a torque check to determine if the bolt preload is correct, and if the preload is correct, before further flight, do a detailed inspection of each barrel nut and cradle for cracking, pitting or corrosion, in accordance with paragraph 3.B., part A, of the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-57-25, dated July 20, 2011. Repeat the torque check and, as applicable, the inspection thereafter at intervals not to exceed 2,000 flight hours or 12 months, whichever occurs first.
(1) For airplanes that have accumulated 1,900 or more total flight hours as of the effective date of this AD, or for which it has been 12 months or more since the date of issuance of the original Canadian airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness as of the effective date of this AD: Within 100 flight hours or 10 days after the effective date of this AD, whichever occurs first.
(2) For airplanes that have accumulated less than 1,900 total flight hours as of the effective date of this AD, and for which it has been less than 12 months since the date of issuance of the original Canadian airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness as of the effective date of this AD: Prior to the accumulation of 2,000 total flight hours or within 12 months since the date of issuance of the original Canadian standard airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness, whichever occurs first.
If any bolt preload is found to be incorrect (i.e., the ring can be rotated during any torque check required by this AD), before further flight, replace all hardware at that location (except the saddle washer and retainer) in accordance with paragraph 3.B., part B, of the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-57-25, dated July 20, 2011.
(i) If any crack, pitting, or corrosion of the barrel nut or cradle is found during any inspection required by this AD, before further flight, replace all hardware at that location (except the saddle washer and retainer) in accordance with paragraph 3.B., part B, of the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-57-25, dated July 20, 2011.
Accomplishment of torque checks, initial inspections, or replacements before the effective date of this AD, in accordance with Bombardier Alert Service Bulletin A84-57-19, dated February 1, 2008; Revision A, dated February 6, 2008; Revision B, dated March 6, 2008; or Revision C, dated August 20, 2008; is acceptable for compliance with the corresponding requirements of paragraphs (g) and (h) of this AD. However, the repetitive inspections required by paragraph (g) of this AD must be continued at the time specified.
Note 1: This AD differs from the MCAI and/or service information as follows: No differences.
