Hi,

I was wondering whether or not it is allowable to use a CLB thrust greater than Takeoff thrust during NADP 1 or 2, on the B737, since if you, for example, derate the TO thrust a lot, and then select normal CLB instead of CLB-1/-2, it will most probably increase from the TO thrust? Because if you read what is stated as required for those procedures they require you to reduce to CLB thrust at 800ft or higher, and if CLB thrust is higher than TO thrust, can it really be considered as a usuable CLB thrust during a NADP?

I believe this is a normal feature and happens often. Some airlines have SOP's that only use CLB thrust so thrust would increase at the 'reduction' height. 

 

Bazza. 

Quite normal. A high assumed temperature will result in a fairly low takeoff N1 figure and indeed when CLB power kicks in, it will often be a higher power setting than that used for the takeoff. For airlines that use CLB/CLB1/CLB2 the advice is usually to let the aircraft choose the climb power setting.