AD 72-10-03

72-10-03 HAWKER SIDDELEY: Amendment 39-1443. Applies to DeHavilland Model D.H. 104 Series 7A, 7AXC, 8A, 8AXC airplanes modified per STC SA1747WE certificated in all categories. (Also known as "Carstedt Jet Liner C-600").

Compliance required prior to further flight after the effective date of this AD as indicated, unless already accomplished.

To prevent fatigue failure of a wing main spar lower attach fitting or of a wing center section lower spar boom, accomplish the following:

(a) Replace each wing lower spar attach fitting P/N CPD 2004 installed under STC SA1747WE at or before 1800 hours' time in service, and at intervals thereafter not to exceed 1800 hours' time in service, with a new attach fitting (Strato Engineering Co., Inc. Part No. CPD 2004).

(b) Replace the wing center section lower spar boom at or before 1800 hours' time in service, and at intervals thereafter not to exceed 1800 hours' time in service, in accordance with DeHavilland Aircraft Company drawing number 4-Z-13775, or another replacement modification approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(c) If aircraft are further modified in accordance with STC SA2438WE, or an alternate acceptable modification approved by the Chief, Aircraft Engineering Division, Western Region, replacement of the parts as specified in (a) and (b) above, may be discontinued.

This amendment becomes effective June 7, 1972.