Originally Posted by
FlightDetent
Haha, already have the QRH open because of the other thread. Bomb is for level flight after descent with CF 1 + L/G down, suggesting 'LO SPD'.
This brings another question, which flaps and speed profile would one choose to minimize fuel burn. It's an edge case only relevant for loss of G HYD at take-off with weather below minima (TKOF alternate).
The conf1+LG down on bomb on board is not for low fuel consumption but rather to minimize damage and ensure basic flap and gear extension in case of bomb explosion in LRBL position!
Originally Posted by
FlightDetent
The idea of calculating this for a MisAPCH from DES after a failure is a bit vain because you won't have 3x the fuel normally needed to ALTN, so no point of diverting.
The other combinations seem only theoretical such as diversion en route (EMERG ELEC) but G/A from the chosen airport, after which a leg to a different backup field needs to be flown.
You will be amazed by seeing the difference in the actual consumption from the flysmart when calculating these penalties. Firstly, when calculating from cruise phase (CRZ-DES), the penalty is far less than when calculating for alternate (CLB-CRZ-DES). Secondly, closer distances mean less difference compared to the normal fuel. That means when the distance between airports is really close, like destination to alternate 80 track miles, the fuel difference figures are much smaller than you think between normal and non standard configurations.
For instance, flying to a 75 track NM ALTN field without failure is 700kgs. With gear down as per QRH its around 2000kgs. Whereas, flysmart in flight for alternate (CLB-CRZ-DES) calculates 1200kgs.