Text in force at 23-63: from 23-7, effective 14 Sep 1969.
[In determining ground loads for skiplanes, and assuming that the airplane is resting on the ground with one main ski frozen at rest and the other skis free to slide, a limit side force equal to 0.036 times the design maximum weight must be applied near the tail assembly, with a factor of safety of 1.]
34 FR 13090 · Source