5.8 Rotors Running Refuelling (RRRF)/helicopter rapid refuelling.................................................................36

5.9 Crane-helicopter operational procedures...........................................................................................................36

5.10 Radio silence - perforating operations ................................................................................................................36

5.10.1  Nature of hazard .........................................................................................................................................................36

5.10.2  Radio silence ................................................................................................................................................................36

5.11 Specialist roles..........................................................................................................................................................37

5.11.1  Land seismic operations ............................................................................................................................................37

5.11.2  Winch operations .......................................................................................................................................................37

5.11.3  Airborne geophysical survey requirements ...........................................................................................................37

5.11.4  Aerial pipeline inspection.........................................................................................................................................37

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Helicopter operations
5.1 Helicopter standards
5.1.1  Minimum operational & role-specific equipment
In addition to the minimum equipment recommendations of Appendix 7 and role-specific equip-ment specified in other Sections of this Guide, the requirements in the following paragraphs should also be considered.

5.1.2  Piston-engine helicopters
Piston-engine helicopters should not be used.

5.1.3  Multi-engine helicopters with single-engine performance
Multi-engine helicopters capable of sustaining a 1% net climb gradient at or above the lowest safe altitude with one engine inoperative (OEI) and flown with two pilots should be used when any of the following conditions exist:
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:
　
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