75-17-16 BELLANCA: Amendment 39-2309. Applies to the Bellanca Models 7ECA, 7GCAA, 7GCBC, 7KCAB, 8KCAB, and 8GCBC airplanes as set forth below.
Compliance required as indicated, unless previously accomplished. A special flight permit pursuant to FAR 21.197 may be issued to allow ferrying of the aircraft to a facility where the required maintenance can be performed.
To prevent possible engine power loss due to fatigue failure of the carburetor alternate air valves, accomplish the following:
A). Within the next 10 hours time in service after the effective date of this AD on Models 7ECA (S/N 985-74 thru 1108-75), 7GCAA (S/N 280-74 thru 319-75), 7GCBC (S/N 604- 74 thru 859-75), 7KCAB (S/N 405-74 thru 532-75), 8KCAB (S/N 12074 thru 204-75), 8GCBC (S/N 1-74 thru 181-75), install Bellanca service Kit No. 248A. Bellanca Service Letter No. 118A pertains to this subject.
B). Within the next 10 hours time in service after June 25, 1975, on the Models 7ECA (S/N 723-70 thru 984-73), 7GCAA (S/N 205-70 thru 279-73), 7GCBC (S/N 202-70 thru 603-73), 7KCAB (S/N 209-70 thru 404-73), 8KCAB (S/N 4-71 thru 119-73), install Bellanca Service Kit No. 251. Bellanca Service Letter No. 120 applies to this subject.
C). At each annual, progressive, or 100-hour inspection as required by Federal Aviation Regulation 91.169, on the Models covered by paragraphs A and B and all subsequent serials of those same models, inspect the alternate air valve for cracks. If any cracks are noted, replace the alternate air valve by installing Bellanca Service Kit 251 on Models 7ECA (S/N 723- 70 thru 984-73), 7GCAA (S/N 205-70 thru 279-73), 7GCBC (S/N 202-70 thru 603-73) 7KCAB (S/N 209-70 thru 404-73), 8KCAB (S/N 4-71 thru 119- 73); Bellanca Service Kit #248A on Models 7ECA (S/N 985-74 and up), 7GCAA (S/N 280-74 and up), 7GCBC (604-74 and up), 7KCAB (405-74 and up), 8KCAB (S/N 120-74 and up), 8GCBC (S/N 1-74 and up).
Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region, 2300 E. Devon Avenue, Des Plaines, Illinois, 60018.
This Amendment supersedes Amendment 39-2173, 40 F. R. 17138, AD 75-09-02 as amended by Amendment 39-2243, and Amendment 39-2261.
This amendment becomes effective August 12, 1975.