Fareastdriver and Crab@SaaAviation
In the case of the BV234LR (civil Chinook), Boeing were told when they were ordered that we would operate them at VNO and at least 90% MAUW for around 150 hours / month. Boeing obviously didn't believe it, and we ended up with over 1000 lbs of reinforcing on each airframe as the build was clearly not up to that task. Clearly all their military operating experience did not read across to the operational pattern of the civil world. And for what it is worth they continued to operate on the Norwegian side of the North Sea long after they were withdrawn on the UK side.