PPRuNe Forums - View Single Post - 737NG: Flying away of the selected altitude while in VS mode
Old 5th Sep 2009, 15:53
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Capt Ted Crilly
 
Join Date: Dec 2005
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v/s mode

hi guys,

i think if one changes the alt rrreeeeaaallllyyyyy slowly as some are saying the best you could get is alt acq. but once in alt acq and a new alt is set in the alt window the vertical mode will revert to the current rate of v/s again. so the fma in the pitch mode would go something like this 1) v/s 2) alt acq depending on how slowly one is moving the alt selector 3) v/s again at the current rate.

i stand to be corrected but v/s only has spd reversion protection on the 737ng i flew and now fly again ie spd gets too slow for the given rate of v/s commanded and the pitch mode changes to lvl chg( for selected spd) upon reaching alpha floor and vice versa for high rates of v/s descent.

rgds
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