83-22-03: Bulkhead Modifications

83-22-03 CANADAIR: Amendment 39-4756. Applies to Canadair Model CL-600-1A11 airplanes, serial numbers 1005 through 1008 and 1010 through 1056, certificated in all categories. Compliance required as indicated, unless already accomplished. A. To ensure the structural integrity of the bulkhead at F.S. 409.00, incorporate modifications in accordance with Canadair Service Bulletin 600-0124, dated March 23, 1982, within the next 25 hours time in service after the effective date of this AD or upon accumulation of 1175 total flying hours, whichever is later. B. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. This amendment becomes effective November 7, 1983.