Airworthiness Directive · Amendment 39-16283 · Electrical power
Bombardier, Inc. Model DHC-8-400 Series Airplanes
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, serial numbers 4001 through 4169 inclusive, certificated in any category.
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.
Within 200 flight hours after the effective date of this AD: Replace the blind fasteners installed at the four wiring harness tie down mount locations with solid rivets; and do a detailed inspection for chafing and damage of the wires and, as applicable, of any Teflon tubing and do all applicable corrective actions; in accordance with paragraph B.(6) of the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-24-44, Revision A, dated February 2, 2010. Do all applicable corrective actions before further flight.
At the applicable time in paragraph (h)(1) or (h)(2) of this AD: Do a detailed inspection of the wiring harness installation along the wing rear spar lower shroud for any chafing and damage, and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-24-44, Revision A, dated February 2, 2010. Do all applicable corrective actions before further flight.
(1) For airplanes with AC feeder cables not covered with protective Teflon tubing (Modsum Number IS4Q2450001 or production Modsum 4Q109946 not incorporated): Within 600 flight hours after the effective date of this AD.
(2) For airplanes with AC feeder cables covered with protective Teflon tubing (Modsum Number IS4Q2450001 or production Modsum 4Q109946 incorporated): Within 4,000 flight hours after the effective date of this AD.
(i) For airplanes on which the temporary repair specified in Bombardier Repair Drawing 8/4-24-011, Issue 2, dated January 21, 2010, has been done: Within 600 flight hours after accomplishing the temporary repair or 60 flight hours after the effective date of this AD, whichever occurs later, do the permanent repair or replace the wiring, in accordance with Bombardier Repair Drawing 8/4-24-011, Issue 2, dated January 21, 2010.
Actions done before the effective date of this AD in accordance with Bombardier Alert Service Bulletin A84-24-44, dated January 27, 2010, are acceptable for compliance with the corresponding requirements of paragraphs (g) and (h) of this AD.
(k) Actions done before the effective date of this AD in accordance with any modification summary identified in Table 1 of this AD are acceptable for compliance with the corresponding requirements of paragraph (g) of this AD.
| Bombardier modification summary— | Revision— | Dated— |
|---|---|---|
| IS4Q5700013 | A | January 12, 2010. |
| IS4Q5700013 | B | January 20, 2010. |
| IS4Q5700013 | C | January 27, 2010. |
Submit a report of the findings (both positive and negative) of the inspection required by paragraph (h) of this AD to Bombardier Technical Help Desk; telephone 416-375-4000; e-mail thd.qseries@aero.bombardier.com; at the applicable time specified in paragraph (l)(1) or (l)(2) of this AD. Use Figures 1 and 2 (Feedback Form) of Bombardier Alert Service Bulletin A84-24-44, Revision A, dated February 2, 2010, to submit the report. The report must include the inspection results, a description of any discrepancies found, the airplane serial number, and the number of landings and flight hours on the airplane.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within 14 days after the inspection.
(2) If the inspection was accomplished prior to the effective date of this AD: Submit the report within 14 days after the effective date of this AD.
Note 1: This AD differs from the MCAI and/or service information as follows: The MCAI does not specify a compliance time for doing a permanent repair or replacement for airplanes on which a temporary repair is done. This AD requires that the temporary repair is replaced by a permanent repair or replacement of the wiring. We have coordinated this difference with Transport Canada Civil Aviation (TCCA).
