Airworthiness directives › 2017-19-27
AD 2017-19-27 Airworthiness Directives; Bombardier, Inc., Airplanes
Models named: DHC-8-401, -402. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bombardier, Inc., Model DHC-8-401 and -402 airplanes, certificated in any category, serial numbers (S/Ns) 4001, and 4003 through 4527 inclusive, equipped with spoiler power control unit (PCU) part numbers (P/Ns) 390700-1007 and -1009 and that have any spoiler PCU serial number identified in paragraph (c)(1), (c)(2), or (c)(3) of this AD. (1) S/Ns 0474 through 1321 inclusive; (2) S/Ns identified in section “4. Appendix” of Parker Service Bulletin 390700-27-002, Revision 1, dated April 13, 2016; and (3) S/Ns 1394 through 1876 inclusive, without suffix “A.”
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 12,000 flight hours or 72 months after the effective date of this AD, whichever occurs first: Remove and replace the affected spoiler PCUs in accordance with paragraph 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 84-27-64, Revision A, dated July 26, 2016.
Unsafe condition
This AD was prompted by the discovery of cracking on two test spoiler PCU manifolds during testing by the manufacturer. We are issuing this AD to prevent cracking of the spoiler PCUs that could lead to the loss of multiple flight controls and landing gear systems.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1