Xfeed on Boeing
 

Hi everybody,
i was wondering if anybody knows why all the DC 9 included the MD 80 serie has no annonciator light during cross feed operation.

Learr

On the DC-8/9 aircraft you have to move a big lever with a big X on it to a position visible to the people that need to know. That obviates the need for a light which can burn out leaving you "in the dark" so to speak...

Maybe the reason is on the DC9 the big lever mechanically actuates the crossfeed valve, so there's no need to confirm it's position, while on Boeings the switch electrically controls the valve, so you need a light to confirm the desired position is actually reached.

Well i'm currently flying the DC9 and i can tell you that moving the lever with the yellow cross on it is not enought and it is very easy to forget the lever in that position.

Learr

That happens on Boeings too...


I usually put the cklist in beetween the thrust levers as a memo.

Other guys turn the radar on test, or other similar tricks...

On those ac fitted with an "oven alarm clock" it's harder to forget...

;)