AMC1 CAT.POL.H.225(a)(5) Helicopter operations to/from a public interest site    

CAA ORS9 Decision No. 1

HELICOPTER MASS LIMITATION

(a) The helicopter mass limitation at take-off or landing specified in CAT.POL.H.225(a)(5) should be determined using the climb performance data from 35 ft to 200 ft at VTOSS (first segment of the take-off flight path) contained in the Category A supplement of the AFM (or equivalent manufacturer data acceptable in accordance with GM1 CAT.POL.H.200 & CAT.POL.H.300 & CAT.POL.H.400).

(b) The first segment climb data to be considered is established for a climb at the take-off safety speed VTOSS, with the landing gear extended (when the landing gear is retractable), with the critical engine inoperative and the remaining engines operating at an appropriate power rating (the 2 min 30 sec or 2 min OEI power rating, depending on the helicopter type certification). The appropriate VTOSS, is the value specified in the Category A performance section of the AFM for vertical take-off and landing procedures (VTOL, helipad or equivalent manufacturer terminology).

(c) The ambient conditions at the site (pressure-altitude and temperature) should be taken into account.

(d) The data are usually provided in charts in one of the following ways:

    (1) Height gain in ft over a horizontal distance of 100 ft in the first segment configuration (35 ft to 200 ft, VTOSS, 2 min 30 sec/2 min OEI power rating). This chart should be entered with a height gain of 8 ft per 100 ft horizontally travelled, resulting in a mass value for every pressure-altitude/temperature combination considered.

    (2) Horizontal distance to climb from 35 ft to 200 ft in the first segment configuration (VTOSS, 2 min 30 sec/2 min OEI power rating). This chart should be entered with a horizontally distance of 628 m (2 062 ft), resulting in a mass value for every pressure- altitude/temperature combination considered.

    (3) Rate of climb in the first segment configuration (35 ft to 200 ft, VTOSS, 2 min 30 sec/2 min OEI power rating). This chart can be entered with a rate of climb equal to the climb speed (VTOSS) value in knots (converted to true airspeed) multiplied by 8.1, resulting in a mass value for every pressure-altitude/temperature combination considered.