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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.
iv) Implement Search & Rescue (SAR) procedures for adverse weather.
b) Significant wave height above 5.5 meters, but less than 7.0 meters.
c) Weather less than 600-foot ceiling and 3 miles visibility (see Section A6.3.3). IFR capable
helicopter and crew required.
d) Pitch, roll, and heave exceeding the guidelines in Section A6.4.2 for floating offshore struc-
tures.
i) The helicopter Flight Manual and Aircraft Operator’s Operations Manual should be
reviewed to determine if landings are possible. ii) If no criteria exist for the model being flown, then the criteria listed above apply. e) Flights in this zone are normally performed only with multi-engine helicopters.
f)  At this stage, the helicopter crew will be expected to indicate that Precautionary Limits have been reached, will advise the OGP Member’s local aviation contact, and jointly they will reach agreement on whether flights should continue or be delayed.
g)  The OGP Member’s supervisor responsible for operations should review all proposed heli-copter operations to determine whether such flights are essential to meet Company objec-tives, or should be delayed. In addition to the items listed in Section A6.5.3 (Precautionary weather condition zone), OGP Member’s should also consider delaying flights to unmanned structures.
h)  Where a number of the criteria above exist simultaneously or if the flights will be at night, the supervisor should assume that the risk level will be higher.

A6.5.4 Emergency weather conditions:
Only emergency operations should be attempted when conditions reach those shown in Section A6.5.3 (Emergency weather condition zone) and those indicated below. See Chart 2. a) Snow or ice accumulation on the helideck. b) Sea-spray blowing across helideck. c) Significant Wave height above 7.0 meters. d) Pitch, roll, and heave on floating structures exceeding the limitations for helicopter opera-tions as listed in Section A6.4.2. e) Flights in this zone are normally performed only with multi-engine IFR capable helicopters and dual IFR qualified pilots. f) At this stage, the helicopter flight crew will be expected to indicate that guideline limits have been reached, and all flights should be delayed, except for life-saving flights.
　
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