Originally Posted by
Airmann
Consider NADP1,
THR RED: 800'
ACCEL: 3000'
Is there any reason why I, due to operational reasons (e.g. constraints on SID) couldn't increase the ACCEL alt?
I have a hunch that the critical issue for NADP1 is close in noise sensitive areas which calls for a THR reduction early, followed by a decent gain in altitude before acceleration. It seems that perhaps 3000' has been chosen more as what the designers considered a minimum acceptable level rather than being specific. That is that they had to specify an alt and based on their research decided that 3000' was good for the procedure. Would my deciding to accelerate at 4000' or 5000' upset anyone?
The need for this profile is somewhat aircraft dependent. We used to use this all the time at certain noise sensitive airports but received waivers for newer aircraft with quieter motors. We rarely use this procedure now as our company only routes the newer aircraft through the noise sensitive airports.