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Appendix 9
Winching (hoisting) operations
In offshore operations personnel transfers are often achieved by helicopter, as is the case for a limited number of onshore scenarios. Winching of personnel can result in additional risks and should only be made after analysis of the hazards. Transfers should be restricted to daylight hours, but this is not always practicable.
A9.1 Personnel transfer by winch
The transfer of personnel by winch can generally be divided into two categories:
1) Crew change transfers
Winching personnel to/from vessels by helicopter for crew changes or other associated routine vessel activities will be conducted in accordance with the International Chamber of Shipping (ICS) Guide to Helicopter/Ship.
Each Operator undertaking winching operations for an OGP Member shall ensure that vessel personnel involved in the operation are cognizant of the procedures contained in the ICS guide.
2) Emergency winching
Emergency winching of personnel via helicopters should be performed using the guidelines in the approved Operations Manual.
Night emergency winching should not be conducted unless the helicopter is properly equipped with items such as auto-hover and the crew (including hoist operator) is trained and current as outlined in their company Operations/Training Manual (see Operational Procedures below).
A9.2 Helicopter performance
For all winching operations, the Operator will use twin-engine helicopters capable of Hover Out of Ground Effect, One Engine Inoperative, (HOGE OEI) for the atmospheric conditions that exist at the time winching is conducted. Exceptions may be considered only in life threatening emergencies and training if:
a) authorized by the local CAA;
b) the Operator has established alternative crew actions for an engine failure that minimizes the risk to occupants, personnel on the vessel, and on the winch line;
c) each person onboard the aircraft is in agreement to conduct the operation; and
d) the vessel or facility has been notified and agreed to the conditions.
In calculating performance limitations for HOGE OEI, no credit should be taken for forecast wind unless it exceeds 10 knots, in which case 50% of the forecast wind may be taken into account. Calculations must include the weight on the winch and the person being winched.
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