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Red Seal Mobile Crane Operator study materials
Red Seal Mobile Crane Operator study resources

Red Seal Mobile Crane Operator: Communication, Signalling, and Hand Signals

Red Seal Mobile Crane Operator · Work through your exam, one topic at a time.

All guide sections

Communication, Signalling, and Hand Signals

What this domain tests

This domain tests whether you can direct a crane safely using standardized hand signals, radio communication, and clear stop signals. The exam expects you to know who may signal, when to stop, and how to handle blind lifts and lost communication.

Core rules and concepts

  • Use the standard Canadian hand signals for hoist, lower, stop, emergency stop, boom up, boom down, swing left, swing right, telescope out, telescope in, and dog everything.
  • One signal person should direct the lift unless the operator and site plan assign another arrangement. Everyone on site should know that anyone may give a stop signal.
  • The operator must stop when the signal is unclear, the signal person is out of view, or communication is lost.
  • Radio communication needs clear channel protocol: identify the crane, repeat critical commands, and confirm. Do not rely on radio if the signal person cannot see the load path.
  • Signal persons must be competent, visible, and positioned to see both the load and the operator.
  • Use tag lines and spotters where needed, but keep them clear of the swing radius and load path.
  • Hold a pre-lift meeting to confirm signals, radio channel, blind spots, and emergency stop procedures.

Worked example

You are booming down when the load swings behind a stockpile and the signal person steps out of view. You stop immediately and hold the load. You do not resume until the signal person is visible again or a verified radio instruction is received. Reason: an unseen load can strike personnel or contact an obstruction, and the operator cannot assume the signal continues.

Traps that cost marks

  • Accepting signals from anyone other than the designated signal person, except stop signals.
  • Continuing when a signal is ambiguous or the signal person is out of sight.
  • Treating radio communication as a substitute for a clear line of sight without a planned relay.
  • Using non-standard hand signals that other workers may misread.
  • Failing to repeat or confirm critical radio commands.