AD 73-24-01

73-24-01 ROCKWELL INTERNATIONAL: Amdt. 39-1743. Applies to Rockwell Commander Model 112 airplanes, Serial Numbers 3 through 120, certificated in all categories.

Compliance required before further flight unless already accomplished.

To prevent failure of the aileron hinges and/or the elevator trim tab hinges, accomplish the following:

(a) Inspect all hinge halves of both ailerons and both elevator trim tabs from underside of aircraft to determine if the hinges are of the formed type made by rolling the edge of a 0.040 inches thick flat sheet or of the extruded type 0.060 inches thick.

(b) If extruded hinge halves are found in all locations, no further action is required.

(c) If a formed hinge piece is found, that complete hinge must be replaced with Rockwell Commander Part No. 42251-1 for the aileron hinges or Rockwell Commander Part No. 44020-5 for the elevator trim tab hinges before further flight. If no cracks are visually evident in any formed hinges,the airplane may be flown in accordance with FAR 21.197 to a base where the replacement can be performed.

Rockwell International Service Bulletin No. SB-112-6 pertains to this same subject.

This amendment becomes effective November 19, 1973.