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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.
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