Fuel Xfeed off for landing
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Join Date: Oct 2003
Location: newzealand
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Fuel Xfeed off for landing
I have often been told that, during S/E ops, prior to landing you should turn the fuel xfeed off and return the engines fuel feed to their primary tanks.
Is this because fuel systems are not certifiied for operations at Go around thrust/power with the xfeed operating or
Is it something that has always been best practice since the second world war.
I have been told this when carrying out OCA's in Jets and turboprops none of which specifically prohibit landing with the xfeed on during.
Does anyone know which one it is? as i have been told both.
Thanks
Is this because fuel systems are not certifiied for operations at Go around thrust/power with the xfeed operating or
Is it something that has always been best practice since the second world war.
I have been told this when carrying out OCA's in Jets and turboprops none of which specifically prohibit landing with the xfeed on during.
Does anyone know which one it is? as i have been told both.
Thanks
Join Date: Jul 2000
Location: Thailand
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X feed valves are either Open or Closed, not On or Off.
During single engine operation, once the fuel is within balanced limits, then the remainder of the flight can be flown with the X Feed Open and all Fuel pumps On.
A regular watch must be kept to insure that any further imbalance does not occur.
You have other things to worry about apart from fuel balancing.
Fix it once and leave it alone.
Don't make a major drama out of a minor crisis.
During single engine operation, once the fuel is within balanced limits, then the remainder of the flight can be flown with the X Feed Open and all Fuel pumps On.
A regular watch must be kept to insure that any further imbalance does not occur.
You have other things to worry about apart from fuel balancing.
Fix it once and leave it alone.
Don't make a major drama out of a minor crisis.
Quote: " During single engine operation, once the fuel is within balanced limits, then the remainder of the flight can be flown with the X Feed Open and all Fuel pumps On".
T'aint necessarily so. This is a furphy put about in simulator exercises, because some older simulators typically will stay in balance when set as described above. In real aeroplanes, chances are that one boost pump will put out more pressure than the others. In some engine-out scenarios, one boost pump in one tank may also be de-powered, thus exacerbating an imbalance if X feed is left open.
Only exception to this with some types is in an excessively low fuel situation when the QRH may say to leave it open.
Bottom line - if the QRH says to close the X feed for landing, just DO it.
T'aint necessarily so. This is a furphy put about in simulator exercises, because some older simulators typically will stay in balance when set as described above. In real aeroplanes, chances are that one boost pump will put out more pressure than the others. In some engine-out scenarios, one boost pump in one tank may also be de-powered, thus exacerbating an imbalance if X feed is left open.
Only exception to this with some types is in an excessively low fuel situation when the QRH may say to leave it open.
Bottom line - if the QRH says to close the X feed for landing, just DO it.
Rubik: Don't know what type you fly, but on my type if you leave the Xfeed on you empty the opposite wing - or with all pumps on, you don't get Xfeed. Please don't assume that all a/c work the same way!
As MEA says, do what it says in the QRH/FM.
As MEA says, do what it says in the QRH/FM.
X feed valves are either Open or Closed, not On or Off.
Bottom line - if the QRH says to close the X feed for landing, just DO it.
