50-04-02 SUPERIOR (Culver): Applies to All Model V, Serial V-3 Through V-357 and Model V2, Serial V2-503 Through V2-517 Not Previously Modified in Accordance With Superior Service Bulletin No. 18.
Compliance required at the next 100-hour inspection but not later than February 1, 1951.
The teeth of the final pinion, P/N 10528, in the gear reduction train of the landing gear retraction motor have inadequate strength to sustain the shock loads due to abrupt reversal of the landing gear retraction switch and to maladjusted limit switches. As stripping of these teeth makes the emergency extension system inoperative, gears 10528 and 10529 should be replaced with gears 11520 and 11521 which have stronger teeth and are obtainable from the Superior Aircraft Co., University Airport, 2501 North Hillside, Wichita 25, Kansas.
(Superior Service Bulletin No. 18 dated November 19, 1947, covers this same subject.)
This supersedes AD 48-05-02, and eliminates placard installation provisions.