77-12-08: External Electrical Ground Power Receptacle

77-12-08 CESSNA: Amendment 39-2918. Applies to the following models and serial numbers of airplanes equipped with external electrical ground power receptacles: MODELS SERIAL NUMBERS 172M 17265685 thru 17267584 172N 17267585 thru 17268080 R172K R1722000 thru R1722109 177B 17702314 thru 17702374, 17702376 thru 17702395, 17702397, 17702398, 17702400, 17702401, 17702403, 17702404, 17702405, and 17702407 thru 17702409 177RG 177RG0788 thru 177RG0822, 177RG0824 and 177RG0826 180J 18052621 thru 18052770 180K 18052771 thru 18052777 182P 18264296 thru 18265175 182Q 18265176 thru 18265220 A185F 18502839 thru 18503165 U206F/TU206F U20603021 thru U20603521 U206G/TU206G U20603522 thru U20603547 207/T207 20700315 thru 20700362 207A/T207A 20700363 thru 20700365 210L/T210L 21061040 thru 21061573 337G 33701672 thru 33701748 T337G P3370226 thru P3370257 Compliance: Required as indicated, unless already accomplished. To prevent unwanted propeller rotation, at the next use of the external ground power receptacle, but not later than September 15, 1977, accomplish the following: A) Test the aircraft's electrical starter system by applying power to the external electrical ground power receptacle. If the propeller does not rotate, make a maintenance record entry indicating that this AD has been accomplished. If the propeller rotates, modify the electrical system in accordance with Cessna Service Letters SE76-11, dated May 10, 1976, SE77-1, dated January 17, 1977, and SE77-1 (Supplement #1), dated May 2, 1977, or later approved revisions, as applicable. NOTE: When performing this test take adequate precautions to assure that no person or object will be struck by the propeller if rotation occurs. B) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective June 27, 1977.