Airworthiness Directive · Amendment 39-18323 · Electrical power
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes, certificated in any category, having serial numbers 20003 through 20382 inclusive, 20384, and 20386.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes. This AD was prompted by multiple reports of chafing found on an electrical wiring harness in the aft equipment bay, caused by contact between the wiring harness and a neighboring hydraulic line. This AD requires an inspection, repair if necessary, and modification of the wiring harness installation to ensure that the wiring harness routing is correct and a minimum clearance between the wire and the hydraulic line is maintained. We are issuing this AD to detect and correct chafing on an electrical wiring harness, which could cause an electrical short circuit or lead to a malfunction of the flight control system, the engine indication system, or the hydraulic power control system; and adversely affect the continued safe operation and landing of the airplane.
Within 36 months after the effective date of this AD, do the actions required by paragraphs (g)(1) and (g)(2) of this AD.
(1) Do a one-time general visual inspection to detect damage (including wear and chafing) of the wiring harness, in accordance with the Accomplishment Instructions of Bombardier, Inc. Service Bulletin 100-24-24, dated June 6, 2014. Repair any damage before further flight, in accordance with the Accomplishment Instructions of Bombardier, Inc. Service Bulletin 100-24-24, dated June 6, 2014; except, where Bombardier, Inc. Service Bulletin 100-24-24, dated June 6, 2014, specifies to contact Bombardier for repair instructions, repair using a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval Organization (DAO).
(2) Modify the wiring harness routing, in accordance with the Accomplishment Instructions of Bombardier, Inc. Service Bulletin 100-24-24, dated June 6, 2014.
For the purposes of this AD, a general visual inspection is a visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.
