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a) The environment is Hostile (see Appendix 6.2.3).
b) Any portion of the flight is performed at night.
c) Any portion of the flight will be in instrument (non-visual) conditions.
5.1.4 Multi-engine helicopters without single-engine climb performance, or
single-engine helicopters, or single pilot
Multi-engine helicopters without single-engine climb performance in cruise, or single-engine heli-copters, or single pilot should ONLY be used when the following conditions are met:
a) When permitted by local regulatory authorities.
b) The environment is determined to be non-hostile (see Appendix 6.2.4).
c) Operations are Day VFR only, and for single-engine helicopters, the aircraft is landed 30 minutes prior to official sunset.
d) Acceptable Search & Rescue Services are available (see Section 12 and Appendices 14 & 17).
e) Continuous Flight Following is maintained.
5.1.5 Helicopters operating in a hostile sea environment
If the sea temperature will be less than 10°C during the flight a risk assessment should be completed to determine if exposure suits should be worn by occupants (see Appendix 6)
5.2 Helicopter performance classes
Helicopters are operated in accordance with a comprehensive and detailed code of performance in compliance with ICAO Annex 6, Part III, Section II, Chapter 3. Since Performance Classes are often misunderstood or misquoted a description based on ICAO Annex 6 are provided in the fol-lowing table:
Class 1
If an engine fails, the helicopter is able to land within the rejected takeoff area or to safely continue flight to an appropriate landing area.
General Instructions:
1) Helicopters must be certificated in Category A
Class 2
If an engine fails, the helicopter is able to safely continue the flight, except when the failure occurs early during takeoff or late in landing, in which case a forced landing may be required.
General Instructions:
1) Helicopters must be certificated in Category A.
2) Operations must not be conducted from/to elevated heliports or helidecks at night or in a hostile environment unless it can be demonstrated that the probability of power unit failure during the exposure time at take off and landing is no greater than 5x10-8 per take-off or landing.
Class 3
If an engine fails, a forced landing is required for single-engine and may be required for multi-engine helicopters.
General Instructions:
1) Helicopters must be certificated in Category A or B.
2) Operations are allowed only in a non-hostile environment, except that flights over-water in a hostile environment for up to 10 mins per flight are permitted.
3) Operations are not allowed at night or when the ceiling is less than 600 ft above the local surface, or the visibility is less than 800 metres.
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飞机管理指导方针 Aircraft management guidelines(28)
