HAC Oil & Gas IBP - Helicopter Association of Canada

ANNEX F LINE HELIPAD DIAGRAM AND CONSIDERATIONSDIMENSIONS FOR USE IN TALL GROWTH VEGETATION / TREES FOR CLEARINGS AND HELIPADSTREESbTREEScaTREESlevellandingplatformfelled treesno obstructions > ¼distance betweenground and tail rotorcTREESDimensions:a: Sides the width of undercarriage + 2m, provided the pilot can see the gearb: Diameter equal to total length of helicopter, including rotor bladesc: Sides 2 x total length of helicopter including rotor blades or 35m, whichever is greaterLANDING AREAS AND CLEARINGSThese dimensions quoted above will have the most relevance to operations in forested or jungle areas wherethe cost and time impact of felling trees and clearing large tracts of vegetation is greatest.In areas where the terrain is hospitable, an increase in the level of safety may be achievable at a reasonablecost by increasing the dimensions of the cleared area. Long line systems for the carriage of external loadsmay also prove beneficial by dramatically reducing the size of many clearings. However, full size clearingsand landing pads will still be required for the movement of passengers and internal cargo. The intervalsalong lines at which helipads will be required will depend on such factors as the type of seismic recordingequipment used and the expectations of the labor force.OGC IBP | Revision Date: Sept 2009 DRAFT60