Preflight inspection should include full-deflection Positive Control Check
Preflight inspection should include full-deflection Positive Control Checks of all control surfaces. Pre-takeoff checks should include an inspection of the tow rope condition and links
CRITICAL ASSEMBLY CHECK (CAC) – A CAC is a control connection check plus an assembly verification, confirming that all required assembly components have been installed and locked properly. Wing pin locks and control connections are typical areas that should be checked. Refer to your specific manufacturers manual for your requirements.
The left wing tape of newly assembled gliders should be noted (date plus initials) prior to pulling the ship to the flight line. FMs and AFMs can deny staging or launch if you do not have a CAC documented by your wing tape notation. The Pilot-in-Command is ultimately responsible to verify control operation with a Positive Control Check (PCC).
Useful links:
SSF – Standard American Soaring Signals
PGC-SSA Wing Running Course.pdf Aerotow Kiting.pdf