A6.3.4 Weather Reports
Providing accurate aviation weather for both current and forecast conditions should be a priority for all flight operations.
Use of personnel trained and certified as aviation weather observers or an Automated Weather Observation System (AWOS) which also provides certified aviation weather are recommended for long-term projects, where appropriate.
When provided, weather reporting equipment should be capable of determining the following infor-mation: wind speed and direction, barometric pressure, temperature, visibility, and ceiling height. Sea state should also be provided for helideck operations and for floating facilities helideck pitch, roll and heave data.
A6.3.5 Adverse Weather Planning
Purpose
The purpose of Adverse Weather Guidelines are to provide open dialogue between the Aircraft Operator and the OGP Member’s local aviation contact when weather conditions become marginal for normal aircraft operations. The dialogue may identify mitigating measures necessary to continue operations at an equivalent level of safety or result in the decision to suspend operations.
Notes:
1) The minimum operating height refers to the height Above Ground Level (AGL) for overland flights, and the height Above Mean Sea Level (AMSL) for
offshore flights.
2) VFR Flights may not depart or continue if the weather conditions at departure, en-route or the destination are below the above stated minimum.
3) Minimum operating height for Day VFR less than a ceiling to 600 feet (inclusion of 100 feet of cloud clearance) and visibility to 2 SM may be allowed if the
procedures are authorized by the appropriate authority. 4) When lower minimums are used, it is recommended that only those twin-engine IFR certified with a dual pilot IFR current crew be used.
Guidance
OGP Member Companies should, through a risk analysis, determine if a localized Adverse Weather Policy should be adopted. Some considerations for an Adverse Weather Policy for offshore helicop-ter operations can be found below.
All factors, including discussions with the Operator, should be reviewed in establishing local adverse weather operational limits.
The OGP Member should always have the option to delay or cancel a flight, even when conditions are technically within limits, should it choose to do so.
The Aircraft Operator’s Operations Manuals may have more restrictive guidelines than those listed in this document.
Factors to Consider
Factors that should be considered in determining if flights should be performed in adverse weather include: a) Aircraft Operator’s compliance with regulatory, Company Operations Manual, and OGP Member’s weather and operational limitations. b) Safe movement of passengers and operation of the aircraft at the landing/departure site. c) Rescue provisions, which will provide a reasonable expectation of rescue both en-route and at the landing site, in the event of a forced landing. d) Degree of urgency of proposed flights.
Precautionary Weather Condition Zone
When conditions have become marginal or reached any of the criteria listed below, the situation may be considered to have reached the “adverse” level, where OGP Member review or intervention may be justified and where “routine” flights may be curtailed.
a) High wind speed or gust spread: aircraft Flight Manuals have operational limits for both speed and gust spread that should be considered, but in any case when wind speed reaches 53-59 knots, OGP Members should consider:
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