72-21-05 CANADAIR: Amendment 39-1536. Applies to all Canadair CL-44 type aircraft certificated in all categories.
Compliance required as indicated.
Within the next 100 hours in service after the effective date of this Airworthiness Directive, unless already accomplished within the last 1900 hours in service and at intervals not exceeding 2000 hours in service from the last inspection accomplish the following:
1. Inspect the horizontal stabilizer rear spar to fuselage attachment fittings, P/N 44A45022A and B, for cracks in accordance with Paragraph 3.4 of Canadair Service Information Circular No. 379-CL44, dated 7 July 1971, or equivalent inspection approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
2. Replace cracked parts before further flight with parts of the same part number or FAA-approved equivalent parts approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, except that the airplane may be flown in accordance with FAR 21.197 to a base where the repair can be performed.
Upon request, with substantiating data submitted through an FAA maintenance inspector, the replacement intervals specified herein may be adjusted by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This amendment is effective October 17, 1972.