Blind Lift adalah crane operation dimana operator tidak bisa melihat load atau landing zone secara langsung dari cabin - high-risk scenario yang memerlukan extra precautions.
Kapan Blind Lift Terjadi:
- Lifting over building atau obstruction
- Long radius lift dimana load beyond visual range
- Night operation dengan limited lighting
- Lifting dari confined space
Hazards of Blind Lift:
- Collision dengan structure atau other equipment
- Load snagging pada obstruction
- Personnel in landing zone - tidak visible dari operator
- Incorrect load positioning
Mandatory Controls untuk Blind Lift:
1. Lift Plan (Non-negotiable)
- Detail drawing showing lift path, clearance, radius
- Load weight, rigging configuration, crane setup
- Communication protocol
- Emergency procedure
- Approved by competent person (lift supervisor/engineer)
2. Qualified Signalman/Banksman
- Minimum 1, ideally 2 untuk complex lift
- Positioned dengan clear view dari load AND operator
- Trained di standard hand signal atau radio protocol
- Has stop work authority
3. Communication System
Radio Communication (Preferred):
- Dedicated channel untuk lift operation
- Clear, specific commands
- Operator repeat back setiap instruction untuk confirm
Example Radio Protocol:
- Signalman: "Hoist 2 meters, slowly"
- Operator: "Hoisting 2 meters, slowly" (execute)
- Signalman: "Stop"
- Operator: "Stopping"
Hand Signals (If Visual Contact Maintained):
- Use standard signal per regulation
- Only ONE designated signalman - avoid confusion
4. Pre-Lift Meeting
- All personnel involved briefed tentang:
- Lift sequence
- Communication method
- Hazards dan controls
- Emergency stop signal
- Exclusion zone
5. Test Lift
- Lift load 6 inches off ground
- Hold untuk verify rigging, balance, brake
- Check communication working
- If okay - proceed dengan lift
Operator Actions:
- ONLY follow signalman instruction - ignore others
- Slow, controlled movement - no rush
- If lose communication - STOP immediately
- If uncertain - STOP and clarify
Blind lift accidents are often fatal - meticulous planning saves lives!
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