Airworthiness Directive · Amendment 39-17027 · Electrical power
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model CL-600-2B16 (CL-604 Variant) airplanes, certificated in any category, serial numbers 5408 through 5665 inclusive, and 5701 through 5856 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B16 (CL-604 Variant) airplanes. This AD was prompted by reports of the air driven generator (ADG) failing to power essential buses during functional tests, due to the low threshold setting of the circuit protection on the ADG's generator control unit (GCU) preventing the ADG from supplying power to the essential buses. This AD requires installing a new or serviceable ADG GCU. We are issuing this AD to prevent loss of power from the ADG to the essential buses which, in the event of an emergency, could prevent continued safe flight.
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 36 months after the effective date of this AD, remove the ADG GCU, Bombardier part number (P/N) 604-90800-7 (Hamilton Sundstrand P/N 761341A), and install a new or serviceable ADG GCU Bombardier P/N 604-90800-27 (Hamilton Sundstrand P/N 761341B), in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 605-24-003, dated April 25, 2011 (for airplane serial numbers 5701 through 5856); or Bombardier Service Bulletin 604-24-023, dated April 25, 2011 (for airplane serial numbers 5408 through 5665).
Note 1 to paragraph (g) of this AD: Bombardier Service Bulletins 605-24-003 and 604-24-023, both dated April 25, 2011, refer to Hamilton Sundstrand Service Bulletin ERPS10G-24-1, dated February 9, 2011, as an additional source of guidance for modifying and testing the ADG GCU with new printed wiring assemblies, and re-identifying the GCU using a new part number.
As of the effective date of this AD, no person may install an ADG GCU, Bombardier P/N 604-90800-7 (Hamilton Sundstrand P/N 761341A), on any airplane.
