INT_IMCA_Three crane incidents_09.2026.pdf

Incident 1: Wire and pulley damaged - What happened?

Whilst a crane was being parked after use, the crane operator unintentionally pulled out the telescopic boom while the hook block was fully retracted and secured in its resting position. As a result of extending the telescope without releasing or lowering the hook, excessive tension was applied to the wire rope and pulley system. This caused overloading of the wire and sheave assembly, leading to breakage of the wire rope and damage to the pulley.

Incident 2: Movement malfunction - What happened?

During routine crane operations, the main boom was raised and extended. Whilst the boom reached the maximum upper position on the first cylinder, the upper limit switch was triggered. Following activation of this limit switch, all crane functions ceased and the system could not be reset or overridden. As a result, the boom remained locked in its maximum upper position. Standard control inputs could not retract or lower the boom, rendering the crane temporarily inoperative.

Incident 3: Crane collision sensor damaged - What happened?

While preparing for lifting operations, the crane operator started to unpark the crane. During this process, the telescope tip slide out from parking socket, dropping approximately 0.5m. This drop caused the crane hook to swing and hit the collision sensor causing damage to the sensor and plate.