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For instance, arm-and-hand signals used during the day may not be visible during darkness.
Lift-off from the pickup zone.a. When the aircraft are loaded and ready for lift-off, the PZCO signals the flight leader using arm-and-hand or light signals.
The PZCO may use schedules, messengers, arm-and-hand signals, light signals, or (as a last resort) radio to order helicopter loads to move to the PZ.
Tom set the panel for "walking" and slipped in a punched tape to control arm-and-hand motions.