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.