Originally Posted by
industry insider
Between 80 to 120' depending on platform. Rigs about 80', some vessels 60'.
Our contracted 225s under IFR and our specified performance requirements would drop 50kg per degree above 25 degrees C. So at 35C, we would lose 500+ kg with an MTOM of 10400-10450 with the flight manual penalty for the forward fuel pods fitted.
I thought that sounded a bit low so I checked some platform drawings (UK NNS). We have 5 at approx. 166', one at 157' and two at 235', all fixed platforms. I would expect the Norwegian ones may be a bit higher still. However CAP437 does state that if a landing area is much in excess of 60m (197') above sea level, the regularity of helicopter operations may be adversely affected in low cloud base conditions.