2-20. UNCOUPLING SEMITRAILER FROM TOWING VEHICLE.
All personnel must stand clear of towing vehicle and semitrailer during uncoupling
operation. Failure to follow this warning may result in serious Injury or death to
a. Chock semitrailer wheels and raise front of semitrailer using landing gear (4) (para 2-13).
b. Disconnect towing vehicle emergency air hose from semitrailer emergency air coupling (3). Disconnect
towing vehicle service air hose from semitrailer service air coupling (1)
c. Disconnect towing vehicle intervehicular cable from semitrailer receptacle (2).
d. Release kingpin lock on fifth wheel of towing vehicle and drive towing vehicle a safe distance from