A B767 in cruise at FL390 discovered a 10000 pound fuel imbalance caused by the inadvertent activation of the xfeed valve switch with the boost pumps on.

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Attributes
ACN	404630
Time
Date	199806
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ztl
State Reference	GA
Altitude	msl bound lower : 39000 msl bound upper : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 24000 flight time type : 700
ASRS Report	404630
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

B767 brand new copilot inadvertently opened the fuel xfeed while turning on fuel boost pumps. B767 has a push on/off switch for xfeed and no other light or lever. Situation remained unnoticed until an EICAS message appeared showing low fuel on one wing. Aircraft procedures require establishing the same fuel confign as we had so no change made. Normal landing but had a 10000 pound fuel imbalance.

Original NASA ASRS Text

Title: A B767 IN CRUISE AT FL390 DISCOVERED A 10000 LB FUEL IMBALANCE CAUSED BY THE INADVERTENT ACTIVATION OF THE XFEED VALVE SWITCH WITH THE BOOST PUMPS ON.

Narrative: B767 BRAND NEW COPLT INADVERTENTLY OPENED THE FUEL XFEED WHILE TURNING ON FUEL BOOST PUMPS. B767 HAS A PUSH ON/OFF SWITCH FOR XFEED AND NO OTHER LIGHT OR LEVER. SIT REMAINED UNNOTICED UNTIL AN EICAS MESSAGE APPEARED SHOWING LOW FUEL ON ONE WING. ACFT PROCS REQUIRE ESTABLISHING THE SAME FUEL CONFIGN AS WE HAD SO NO CHANGE MADE. NORMAL LNDG BUT HAD A 10000 LB FUEL IMBALANCE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.