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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.
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:
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.
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飞机管理指导方针 Aircraft management guidelines(80)
