77-02-10 CANADAIR: Amendment 39-2821. Applies to all CL-44D4 and CL-44J airplanes, certificated in all categories.
Compliance required within the next six months, unless already accomplished within the last six months, and thereafter at subsequent intervals not to exceed twenty-four months, after the effective date of this AD.
(a) To detect corrosion in the fuselage skin in the area where the bonding strip under the ice guards contacts the fuselage, inspect bonding strip in accordance with Canadair Service Information Circular No. 385-CL44, dated May 19, 1975, or an approved equivalent inspection.
(b) If corrosion is detected, replace bonding strips and repair fuselage skin in accordance with the circular referenced in paragraph (a) or an approved equivalent alteration.
(c) The repetitive inspection required by this AD also applies to aircraft on which the beryllium copper bonding strips have been replaced by aluminum alloy in accordance with the circular referenced in paragraph (a) or an approved equivalent part.
(d) Equivalent inspections of parts must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
(e) Upon request, with substantiating data submitted through an FAA maintenance inspector, the compliance time of this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This Amendment is effective February 4, 1977.