83-10-05 CANADAIR: Amendment 39-4654. Applies to all Canadair Model CL-44D4 and CL-44J airplanes. Compliance required as indicated unless previously accomplished. To detect cracks in the horizontal stabilizer rear attachment fittings, accomplish the following:
1. Within the next 200 hours time in service and thereafter at intervals not to exceed 2000 hours time in service, inspect the horizontal stabilizer rear spar attachment fittings, Part Numbers 44-A45022A and 44-A45022B, for cracks in accordance with Paragraph 3.5 and 3.6 of Canadair Service Information Circular No. 379-CL44, Issue 3, dated February 23, 1982. Ensure that the lugs are properly shimmed in accordance with paragraph 4.1 of the circular. If a crack is found the length of which is less than half the width of the lug, repeat the inspection every 100 hours time in service and replace the fitting within the next 500 hours time in service. When a crack is found the length of which extends to or beyond half thewidth of the lug, replace the fitting prior to further flight in accordance with the circular.
2. Within the next 200 hours time in service and thereafter at intervals not to exceed 2000 hours time in service, inspect the reinforcing channels, Part Numbers 28-A24559A and 22- A24559B, for cracks in accordance with paragraph 3-11 of Canadair Service Information Circular No. 379-CL44, Issue 3, dated February 23, 1982. If a crack is found in the reinforcing channel, replace the part prior to further flight in accordance with the circular. Terminating action for this inspection consists of replacement of the reinforcing channels with steel reinforcements, Parts Numbers 28-21312-2, -3, -4, and -5 in accordance with paragraphs 3.13 and 3.14 of the Service Information Circular.
3. 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.
4. 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 June 6, 1983.