Airworthiness Directive · Amendment 39-11902 · Bombardier Model CL-600-1A11 (CL-600) and CL-600-2A12 (CL-601) Series Airplanes
Bombardier Model CL-600-1A11 (CL-600) and CL-600-2A12 (CL-601) Series Airplanes
Model CL-600-1A11 (CL-600) series airplanes, serial numbers 1004 through 1066 inclusive and 1068 through 1085 inclusive, and Model CL-600-2A12 (CL-601) series airplanes, serial numbers 3001 through 3050 inclusive; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (e) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to Bombardier Model CL-600-1A11 (CL-600) and CL-600-2A12 (CL-601) series airplanes, that requires modification of the main landing gear (MLG) brake units and inboard MLG wheels; and a revision to the Airplane Flight Manual (AFM) to include the increased cooling times for the modified brakes. This amendment allows, for certain cases, removal of the inboard and/or outboard wheel discs by installation of a placard to limit airplane operation on the ground and a revision to the AFM to include information for operating the airplane with the wheel discs removed. Additionally, this amendment provides for an acceptable method of compliance that involves installation of a new revision to the AFM. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent water freezing on the brake while the airplane is in flight due to water, slush, or snow from the runway entering into the brake assemblies during takeoff, and consequently, a tire burst during landing of the airplane.
To prevent water freezing on the brake while the airplane is in flight due to water, slush, or snow from the runway entering into the brake assemblies during takeoff, and consequently, a tire burst during landing of the airplane, accomplish the following:
(a) Except as required by paragraph (b) of this AD, within 300 flight cycles after the effective date of this AD, accomplish the actions required by paragraphs (a)(1) and (a)(2) of this AD in accordance with the Accomplishment Instructions of Canadair Challenger Service Bulletin 600-0369, Revision 4, dated June 27, 1984, including Attachment 1, dated December 6, 1983, and Attachment 2, dated January 11, 1984 [for Model CL-600-1A11 (CL-600) series airplanes]; or 601-0024, Revision 3, dated November 27, 1984, including Attachment 1, dated June 21, 1984, Attachment 2, dated December 6, 1983, and Attachment 3, dated January 11, 1984 [for Model CL-600-2A12 (CL-601) series airplanes]; as applicable.
(1) Modify the main landing gear (MLG) brake units and inboard MLG wheels.
Note 2: Part A of the Accomplishment Instructions of Canadair Challenger Service Bulletin 600-0369, Revision 4, dated June 27, 1984, including Attachment 1, dated December 6, 1983, and Attachment 2, dated January 11, 1984; has been accomplished on airplane serial number 1072 in production.
(2) Revise the Normal Procedures Section of the FAA-approved Airplane Flight Manual (AFM) to include the brake cooling times for the modification specified in paragraph (a)(1) of this AD. This AFM revision may be accomplished by inserting the applicable AFM revision listed in the applicable service bulletin listed in paragraph (a) of this AD. Subsequent AFM revisions may be inserted in the AFM provided that the brake cooling information is identical to the applicable AFM revision listed in the applicable service bulletin listed in paragraph (a) of this AD.
(b) Operation of the airplane from contaminated runways (i.e., wet, snow covered, or slush covered surfaces) is prohibited until the actions required by paragraph (a) or (d) of this AD are accomplished.
(c) For airplanes that do not operate from a wet runway where the ambient temperature is below 10 degrees Celsius: It is permissible to remove the inboard and/or outboard wheel discs upon accomplishment of the actions specified in paragraphs (c)(1) and (c)(2) of this AD, in accordance with Canadair Challenger Service Bulletin 600-0662, dated November 30, 1995 [for Model CL-600-1A11 (CL-600) series airplanes]; or 601-0467, dated November 30, 1995 [for Model CL-600-2A12 (CL-601) series airplanes]; as applicable. The placard and AFM revision required by paragraphs (c)(1) and (c)(2) of this AD may be removed upon reinstallation of the inboard and outboard wheel discs.
(1) Install a placard on the instrument panel that states the following: “WHEEL DISCS ARE REMOVED—REFER TO AFM FOR LIMITATIONS”
(2) Revise the Limitations Section of the AFM to include information for operating the airplane with the wheel discs removed. This AFM revision may be accomplished by inserting the applicable AFM revision specified in the applicable service bulletin listed in paragraph (a) of this AD. Subsequent AFM revisions may be inserted in the AFM provided that the information for operating the airplane with the wheel discs removed is identical to the applicable AFM revision specified in the applicable service bulletin listed in paragraph (a) of this AD.
(d) For all airplanes: Installation of the AFM revision specified in either paragraph (d)(1) or (d)(2) of this AD, as applicable, is acceptable for compliance with the requirements of paragraphs (a) and (b) of this AD, as applicable.
(1) Bombardier Model CL-600-1A11 (CL-600) AFM Revisions A84 and 76, both dated February 7, 2000; or
(2) Bombardier Model CL600-2A12 (CL-601) AFM Revisions 45, 48, 50, and 86, all dated February 7, 2000.
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.
