47-50-02 CESSNA: Applies to 120 and 140 Aircraft Serial Numbers Up to and Including 14289.
Inspection required upon each 100 hours of operation until fuselage rear bulkhead (tail post) has been reinforced.
Inspect the lower right-hand corner of the cutout in the fuselage rear bulkhead for cracks which usually extend down to the rivet holes at the nearest anchor nut. If cracks are found, install the new type bulkhead with reinforcement channel added per Cessna Drawing No. 0412169.
(Cessna Service Letter No. 46 dated July 31, 1947, covers this same subject.)