Blind Lifts
A blind lift is any lift where the crane operator can’t see the load, the landing zone or the path the load travels, like setting rooftop units, lifting over a building or lowering into a pit. The operator is depending completely on someone else’s eyes, so communication has to be perfect.
- Construction
- Cranes
- Rigging
When a signal person is required
Under OSHA’s crane rule (29 CFR 1926.1419), a signal person must be used when:
- The point of operation (the load or the landing area) isn’t in full view of the operator
- The operator’s view in the direction the crane is traveling is blocked
- The operator or the person handling the load decides it’s needed because of site-specific safety concerns
The signal person must be qualified, by a third-party qualifier or the employer’s qualified evaluator, and must know the signals, the crane’s basic operation and the hazards. See Signal Person Qualification.
Plan the lift
- Hold a pre-lift meeting with the operator, signal person and riggers. Agree on signals, who signals when, and the stop plan.
- Walk the load path. Look for obstructions, power lines, people and the landing area. See Cranes & Power Lines.
- Barricade the swing area and the area under the load path.
- Use tag lines to control the load where it’s safe.
- For complex blind lifts, use a written lift plan. See Lift Planning.
Hand signals or radio?
- Hand signals must follow the standard method in OSHA’s Appendix A (or another approved standard method), and the signal person must stay in clear view of the operator. See Crane Hand Signals.
- When the signal person can’t see the operator, use radio or voice signals. Test the radios before the lift.
- Use a dedicated channel that only the lift crew uses. See Radio Signals.
- For radio, give continuous direction during the move (for example, “swing left, swing left, swing left…”) so silence means something is wrong.
- Start each signal with the crane’s name or number if more than one crane is working.
Rules during the lift
- Only one person gives signals to the operator at a time. If the load passes from one signal person to another, the hand-off must be clear.
- Anyone can give an emergency stop signal, and the operator must obey it.
- If the operator loses communication or can’t understand a signal, they must stop the crane and wait until communication is restored.
- The operator moves only on signals they clearly understand.
Cameras
Some cranes and contractors use load or boom-tip cameras. They help, but they don’t replace a qualified signal person when OSHA requires one, and they can lose signal, fog up or mislead you about distance.
Blind lift checklist
- Qualified signal person assigned and in position
- Radios tested on a dedicated channel
- Load path walked; power lines and obstructions identified
- Swing and landing areas barricaded
- Stop plan agreed if communication is lost
Standards & references
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