F100 flight crew has fuel imbal, declares emergency.

Attributes
ACN	557782
Time
Date	200208
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 8000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	557782
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : landed as precaution
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Downwind from dietz to dfw runway 17C approach, declared emergency due to sudden indication of 2600 pounds in left main fuel tank and 800 pounds on right tank. Indications were associated with 'asymmetrical fuel warning' on MFDU. I had checked the fuel about 10 mins earlier and everything was normal. About 1 min later we saw 600 pounds on the right tank and then 400 pounds. I declared an emergency and we used xfeed to fly the approach and land. I thought the engine was going to fail during the approach. Upon landing all the gauges suddenly indicated 2500 pounds on each tank. Maintenance stated that this was due to water in the fuel tanks.

Original NASA ASRS Text

Title: F100 FLC HAS FUEL IMBAL, DECLARES EMER.

Narrative: DOWNWIND FROM DIETZ TO DFW RWY 17C APCH, DECLARED EMER DUE TO SUDDEN INDICATION OF 2600 LBS IN L MAIN FUEL TANK AND 800 LBS ON R TANK. INDICATIONS WERE ASSOCIATED WITH 'ASYMMETRICAL FUEL WARNING' ON MFDU. I HAD CHKED THE FUEL ABOUT 10 MINS EARLIER AND EVERYTHING WAS NORMAL. ABOUT 1 MIN LATER WE SAW 600 LBS ON THE R TANK AND THEN 400 LBS. I DECLARED AN EMER AND WE USED XFEED TO FLY THE APCH AND LAND. I THOUGHT THE ENG WAS GOING TO FAIL DURING THE APCH. UPON LNDG ALL THE GAUGES SUDDENLY INDICATED 2500 LBS ON EACH TANK. MAINT STATED THAT THIS WAS DUE TO WATER IN THE FUEL TANKS.

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.