Are you aware of the customers site safety rules, emergency procedures and rescue plans if working at height?
Are you and the machine in a safe and suitable environment?
Are you equiped with the suitable PPE?
Do you all the necessary tools/equipment to work safely?
Are any power tools to be used in a good and safe condition?
Are you aware of local environmental procedures for oil spillages, pollution, noise etc?
Are all personnel protected from falling objects?
Have all precautions been taken to prevent fire, electrocution, burn, drowning, falls, crushing, trapping any other health risks?
Is there sufficient natural light/arificial lighting to work safely?
If accompanied by visitors, have they been made aware of any relevant risk assessments?
Are you or other personnel suitably qualified to operate any of the crane/equipment in use?
Is all lifting equipment certified and in test period, is it also suitable for the job?
If using hazardous substances, do you have all the relevant safety data sheets and hazardous information?
Have you made the customer aware lone working is not permitted?
If working at height, is suitable equipment and protection available?
If the task involves hot work have specific precautions been taken and fire fighting equipment is located near by?
WARNING - If you are not able to answer YES to any of the above questions, PAUSE, ASSES and RESOLVE the issue with the customer. If this is not possible then escalate this to your relevant supervisor/manager.