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If the PRH measurement system is capable of recording accurate helideck movements for at least ten minutes and can calculate the average heave rate, then less restrictive limits than those indicated in the chart above may be applied to specific floating facilities. Such variances must be allowed in the local operator’s Operations Manual, and be documented in the local helideck operating procedures/diagrams and facility helideck procedures. The OGP Member’s Aviation Advisor should be con-sulted for relevant guidance before the variances are implemented.
When a vessel gives clearance for a helicopter to land on deck, the intention is for that vessel to maintain the existing heading while the helicopter remains on the deck. The monitoring station providing deck motion limits and wind data must be manned during the entire time the helicopter is operating on the deck.
The helicopter crew is to be notified immediately by radio if any of the following occurs: the vessel goes off heading by 10 degrees or more, there is a vessel/installation or station keeping/handling problem, pitch/roll/heave exceeds the limits in Table 4.2 above, a significant change in the relative wind of 30 degrees or more, or there is any other abnormal event.
The operational limitations for helicopter operations to monohull vessels with helidecks greater than or equal to eighty (80) feet above sea level are more restrictive than the chart above, may vary by helicopter model, and prior to operation to such vessels, the OGP Member’s Aviation Advisor should be contacted for relevant guidance.
Deck Limitations are not applicable for takeoff from the helideck.
A6.5 Offshore helicopter adverse weather operational limitations
A6.5.1 Purpose
See Section A6.3.5 for general planning guidance for adverse weather.
A6.5.2 Factors to consider
Among factors that should be considered in determining if flights should be performed in adverse weather, in addition to those listed in A6.3.5 are the following:
a) Safe movement of passengers and operation of the helicopter on the helideck.
i) Assign helideck assistance as necessary.
ii) Consider changing passengers out 1-1, 2-2, etc.
iii) Consider use of helideck rope from stairwell to a point adjacent to helicopter (do NOT tie the rope to the helicopter).
iv) Brief passengers on special helideck procedures.
A6.5.3 Precautionary weather conditions
When conditions broadly reach any of the criteria listed below, and those shown in Section A6.3.5 (Precautionary weather condition zone), the situation may be considered to have reached the “Adverse” level, where OGP Member Review/Intervention may be justified (see Chart 2).
a) Wind speed 53-59 knots.
i) Suspend flights to unmanned structures.
ii) Implement special passenger handling procedures.
iii) Advise inbound flights of weather conditions.
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飞机管理指导方针 Aircraft management guidelines(82)
