Originally Posted by low n' slow
VNAVSPD, After having read the AOM for the 340B I just get more confused.
This is my understanding after having read the part of the BG operation
Between the GND IDLE STOP and the FLT IDLE STOP, advancing the power levers will coarsen the blade angles. When doing this the forward Np sensor will detect a reduction in PRPM and send a signal to the bottoming governor that send a signal to the torquemotor to increase fuel flow and thus increase Ng and in turn maintain PRPM at a reference speed.
Perhaps I shouldn't get so excited, this is really type specific stuff I guess
/LnS
It's to keep the AC generator online for anti-icing, IIRC.