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Normal and auxiliary control systems built into a mobile elevating work platform (MEWP) will allow the operator to bring the platform of the machine safely to ground level under controlled conditions. It is extremely unusual not to be able to lower the platform using these controls or for all of these systems to fail. The following is an example of a rescue plan for people who work at height using a MEWP.
Further guidance on mid-air rescue can be found in ISO 18893:2014 - 220.127.116.11.
Ref: UKBM 07/14-002