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i) Specialized passenger handling procedures; and ii) advising inbound flights of the weather conditions. b) Weather less than 600-foot ceiling and 3 miles visibility (see above) require IFR capable multi-engine aircraft and crew. c) Severe loose dust or blowing snow or other conditions at the landing site that may inhibit visibility requires specialized pilot training and/or operational procedures. d) Severe cold conditions below -29° Celsius (-20°F) may require specialized passenger and
aircraft handling procedures. e) Any other conditions established for this Zone by the OGP Member. f) At this stage, the aircraft crew or Aircraft Operator 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 air-craft operations, to determine whether such flights are essential to meet company objec-tives, or should be delayed. When delaying flights, the supervisor may consider prioritizing as noted below:
i) Flights for visits by non-operational staff or other non-essential flights. ii) Flights for routine crew changes. 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.

Emergency Weather Condition Zone
Among the conditions to be considered when routine or precautionary level flights shall be consid-ered for curtailment and only emergency operations should be considered are those listed below.
a) Winds above 60 knots.
b) Extreme cold below -40°C (-40°F).
c) For all floatplanes, no water landings with sea state above one foot. For amphibious float-

planes, no landings below -1°C (+30°F). d) Any other conditions established for this Zone by the OGP Member Company. e) Flights in this Zone are normally performed only with multi-engine IFR equipped aircraft
and dual IFR qualified pilots. f) At this stage, the flight crew, Aircraft Operator or OGP Member’s local aviation contact will be expected to indicate that guideline limits have been reached, and all flights should be delayed, except for life-saving flights. g) Qualified medical advice should be sought before launching an emergency flight for medi-cal reasons, in order to establish that the risk facing the patient exceeds the risk to the air-craft and crew. h) OGP Member’s supervisors should consider the landing area unsafe for personnel for rou-tine or precautionary operations.

 

A6.4 Offshore helicopter weather limits & reporting
A6.4.1  Limitations
Section A6.3.3 provides offshore weather limitations and procedures to be followed for adverse weather.

A6.4.2  Floating helidecks - pitch, roll, heave & additional weather limitations/ guidelines
Conditions  Limits for Landing - Day  Limits for Landing - Night  Limits for Planning - Day  Limits for Planning - Night 
Pitch and Roll  +3 o  +2 o  +3 o  +2 o 
Average Heave Rate  1.0 m/sec  0.5 m/sec  1.3 m/sec  0.5 m/sec 

Measurement of Pitch, Roll & Heave (PRH)
A method of measuring PRH shall be available and a means provided to transmit that data to flight crews prior to landing. The accelerometers for such measurements should be located as close to helideck level and centerline as possible to provide accurate readings. The accelerometer readings may be processed by sophisticated software that can produce accurate helideck level measurements of PRH regardless of the accelerometer location. Provided the system is operational, and these cal-culations can provide accurate output of the helideck PRH movements, they may be used for pilot information.
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.
　
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