AD 91-19-01

91-19-01 CANADAIR, LTD.: Amendment 39-8026. Docket No. 91-NM-161-AD.

Applicability: Model CL-600-1A11 series airplanes, serial numbers 1004 through 1085; Model CL-600-2A12 series airplanes, serial numbers 3001 through 3066; and Model CL-600-2B16 series airplanes, serial numbers 5001 through 5098; certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent loss of emergency power to the essential bus when the air driven generator (ADG) is deployed, accomplish the following:

(a) Within 25 hours time-in-service after the effective date of this AD, inspect the ADG wiring harness to detect chafing, in accordance with Canadair Service Bulletin A600-0612 (for Model CL-600-1A11 series airplanes), dated April 24, 1991, or Canadair Service Bulletin A601-0370 (for Model CL-600-2A12 and CL-600-2B16 series airplanes), dated April 24, 1991. If chafing is found, prior to further flight, repair in accordance with the applicable service bulletin previously described.

(b) Within 60 days after the effective date of this AD, modify the ADG harness installation in accordance with Canadair Service Bulletin A600-0612 (for Model CL-600-1A11 series airplanes), dated April 24, 1991, or Canadair Service Bulletin A601-0370 (for Model CL- 600-2A12 and CL-600-2B16 series airplanes), dated April 24, 1991.

(c) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, New York Aircraft Certification Office, ANE-170, FAA, Engine and Propeller Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, New York Aircraft Certification Office, ANE-170.

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of thisAD.

(e) The inspection, repair, and modification requirements shall be done in accordance with Canadair Service Bulletin A600-0612 (for Model CL-600-1A11 series airplanes), dated April 24, 1991, or Canadair Service Bulletin A601-0370 (for Model CL-600-2A12 and CL-600-2B16 series airplanes), dated April 24, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station A, Montreal, Quebec, Canada H3C 3G9. Copies may be inspected at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; at the FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

This amendment (39-8026, AD 91-19-01) becomes effective on September 24, 1991.