80-05-02 HAMILL MANUFACTURING COMPANY: Amendment 39-3700. Applies to Model GA-4 and GA-5 safety belt assemblies marked as meeting the standards of FAA TSO-C22F. These safety belts are installed in, but not limited to, the following aircraft operated by General Motors Corporation and Firestone Tire and Rubber Company: Grumman American 1159, Rockwell International NA265, Convair 580 and Hawker Siddeley DH125.
These safety belts can no longer be considered to meet the standards prescribed by FAA TSO-C22f and the approved special criteria for push-button release mechanisms which requires the push-button force to be between 2.5 and 8 pounds when using the loading conditions specified in FAA TSO-C22f (Section 4.3.2.2 of NAS 802).
Within 120 days from the effective date of this AD, these safety belts shall not be used in type certificated aircraft.
This amendment becomes effective February 27, 1980.