Airworthiness Directive · Amendment 39-14707 · Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
This AD applies to Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial numbers 7003 through 7990 inclusive and 8000 and subsequent.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD requires inspecting contactors 1K4XD, 2K4XD, and K4XA to determine the type of terminal base plate, and applying sealant on the terminal base plates, if necessary. This AD results from incidents of short circuit failures of certain alternating current (AC) contactors located in the avionics bay. We are issuing this AD to prevent short circuit failures of certain AC contactors, which could result in arcing and consequent smoke or fire.
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 800 flight hours or four months after the effective date of this AD, whichever occurs first: Do a general visual inspection of AC service bus contactors 1K4XD and 2K4XD, part number (P/N) D-18ZZA, and the utility bus contactor K4XA, P/N D-7GRZ, to determine which contactors have an Ultem 2200 terminal base plate (i.e., the plate is made from a black molded thermal plastic material), and apply RTV sealant to the terminal base plate, as applicable, by doing all the actions specified in the Accomplishment Instructions of Bombardier Service Bulletin 601R-24-122, Revision A, dated July 13, 2006. Do all applicable applications of sealant before further flight.
Note 1: 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.”
Actions accomplished before the effective date of this AD in accordance with Bombardier Drawing Number K601R50180, dated June 2, 2006; or Bombardier Service Bulletin 601R-24-122, dated June 27, 2006; are considered acceptable for compliance with the actions specified in paragraph (f) of this AD.
As of the effective date of this AD, no person may install AC contactor 1K4XD, 2K4XD, or K4XA, having an Ultem 2200 terminal base plate, on any airplane, unless RTV sealant has been applied to the terminal base plate in accordance with Bombardier Service Bulletin 601R-24-122, Revision A, dated July 13, 2006.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
