Airworthiness Directive · Amendment 39-17982 · Electrical power
Bombardier, Inc. Airplanes
Superseded. A later AD replaced this one: AD 2017-17-02. 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 through 4347 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by reports of missing clamps that are required to provide positive separation between the alternating current (AC) feeder cables and the hydraulic line of the landing gear alternate extension. This AD requires an inspection for missing clamps that are required to provide positive separation between the AC feeder cables and the hydraulic line of the landing gear alternate extension, and related investigative and corrective actions if necessary. We are issuing this AD to detect and correct chafing of the AC feeder cable. A chafed and arcing AC feeder cable could puncture the adjacent hydraulic line, which, in combination with the use of the alternate extension system, could result in an in- flight fire.
Within 6,000 flight hours or 36 months after the effective date of this AD, whichever occurs earlier: Do a general visual inspection for installation of clamps between the AC feeder cables and hydraulic line; and do all applicable related investigative and corrective actions; in accordance with paragraph 3.B., “Procedure,” of the Accomplishment Instructions of Bombardier Service Bulletin 84-24-53, Revision A, dated May 16, 2013. Do all applicable related investigative and corrective actions before further flight.
