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Appendix 6 Aviation weather guidelines
A6.1 General
This document is a provided as a guide for planning and operational decisions in regard to weather, both adverse and routine, and the impacts of weather criteria on aircraft selection/operation. It is designed for use for all aircraft operations, both aeroplane and helicopter, and for onshore/offshore operations.
A6.2 Operating environment & weather
A6.2.1 Hostile vs. non-hostile environment
In determining the type of aircraft and the operational parameters to be specified for a specific project, the user should first determine the type of operating environment (hostile or non-hostile), including weather considerations, as noted in Chart 1 at the end of this appendix.
A6.2.2 Risk factors
Factors to be considered in determining the environment include: local topographical considera-tions; weather and temperature conditions; restrictions to visibility; day or night; flight-crew expe-rience in the environment and operation; type of operation; availability of infrastructure such as airfields, helipads, refuelling, and navigational aids; communications; aircraft type; protection of occupants following an unscheduled landing; and search and rescue resources in the area of opera-tion. See Chart 2 for a matrix of related weather factors and the Survival Equation Matrix at the end of this Appendix.
A6.2.3 Hostile environment
Hostile environment definition
An environment in which a successful emergency landing cannot be assured, or the occupants of the helicopter cannot be adequately protected from the elements, or search and rescue response/capabil-ity cannot be provided consistent to the anticipated exposure.
Hostile environment aircraft requirements
A twin-engine aircraft able to sustain one engine inoperative (OEI) flight in cruise should be speci-fied for operations in a hostile environment. See Chart 1.
A6.2.4 Non-hostile environment
Non-hostile environment definition
An environment can be considered non-hostile subject to the criteria shown in Chart 1 and satisfac-tory review and or mitigation of each of the following:
a) an environment in which a successful emergency landing can be reasonably assured;
b) the occupants can be protected from the elements; and
c) search and rescue response/capability is provided consistent with anticipated exposure.
Non-hostile environment aircraft requirements
Single-engine aircraft that have been satisfactorily reviewed may be used in a non-hostile environ-ment. See Chart 1.
A6.3 Flight rules & weather
A6.3.1 Instrument Flight Rules (IFR)
IFR operations should comply with local regulatory IFR weather minimums unless more stringent Company requirements are issued.
. 2008 OGP
A6.3.2 Visual Flight Rules (VFR)
Weather minimums are contained in the table below.
Local regulatory minimums are to be followed when their guidance is more conservative than those contained in the table below or in mission-specific weather minimums presented in other sections of this guide.
A6.3.3 VFR weather minimums
Flight Regime Minimum Operating Height (1) Cloud Base (feet) Visibility (SM) (4) Requirements to fly given these VFR weather minimums (2)
500 Feet (3,4) 600 Feet 3 SM (3,4)
Offshore - Day 400 Feet 500 feet 1/2 SM Offshore helicopter interfield use only if visual contact is maintained with other facilities.
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