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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.
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)
Offshore - Day
500 Feet (3,4)
600 Feet
3 SM (3,4)
400 Feet
500 feet
1/2 SM
Offshore helicopter interfield use only if visual contact is maintained with other facilities.
Overland - Day
500 Feet (3)
600 Feet
3 SM (3)
All Night Ops (3)
Night Flights will be flown using only IFR procedures and minimums where available, otherwise the VFR minimum shall be a cloud base of 1000 feet with 100 feet of vertical cloud clearance and 3 SM visibility.
Twin-engine IFR certified helicopter with dual IFR-night current crew. All night flights should utilize IFR cockpit procedures for takeoffs and landings.
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.
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