64-14-02 de HAVILLAND: Amdt. 754 Part 507 Federal Register June 23, 1964. Applies to All Model DHC-2 Series Aircraft.
Compliance required as indicated.
As a result of failure of the elevator trim tab end blocks, C2TE49ND and C2TE50ND, which could lead to restriction of elevator movement, accomplish the following:
(a) Within 50 hours' time in service after the effective date of this AD, unless already accomplished within the last 450 hours' time in service, and thereafter within 500 hours' time in service from the last inspection, visually inspect all four red fibre end blocks in elevator trim tabs, C2TE43A and C2TE44A, for indications of delamination, warping, and cracks, especially around the rivet holes.
(b) Replace any defective part with a new part of the same part number, or an FAA approved equivalent, before further flight, except that one flight may be made in accordance with the provisions of CAR 1.76 for the purpose of obtaining these repairs.
(c) The 500-hour repetitive inspections of paragraph (a) need not be made on aircraft which already incorporate fabric-base phenolic end blocks and may be eliminated on aircraft that are modified by replacing the red fibre end blocks with blocks manufactured from plastic sheet, laminated, thermosetting, cotton fabric-base, phenolic resin MIL-P-15035C Type FBG (general purpose grade), or an FAA-approved equivalent in accordance with the procedure outlined in de Havilland Engineering Bulletin Series "B", No. 30, dated October 15, 1963.
(de Havilland Engineering Bulletin Series "B", No. 30, dated October 15, 1963, available from de Havilland Aircraft of Canada, Ltd, Toronto, Canada, covers this same subject.)
This directive effective July 24, 1964.