Commuter light transport diverted to alternate because a fuel imbalance developed that was in excess of operation manual maximum and it could not be corrected by checklist procedure.

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Attributes
ACN	166540
Time
Date	199012
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mgw
State Reference	WV
Altitude	msl bound lower : 17000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : v44
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 4200 flight time type : 2800
ASRS Report	166540
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Taxi and takeoff, fuel tanks were balanced. At cruise the right tank dropped to 300 pounds less than the left fuel tank. Flight manual split is 200 pounds maximum. Boost pump and xfeed actions made no impact on 300 pounds split. Declared an emergency at iad for fuel tank imbalance, landed safely, checklists used at all time.

Original NASA ASRS Text

Title: COMMUTER LTT DIVERTED TO ALTERNATE BECAUSE A FUEL IMBALANCE DEVELOPED THAT WAS IN EXCESS OF OPERATION MANUAL MAX AND IT COULD NOT BE CORRECTED BY CHECKLIST PROC.

Narrative: TAXI AND TKOF, FUEL TANKS WERE BALANCED. AT CRUISE THE R TANK DROPPED TO 300 LBS LESS THAN THE L FUEL TANK. FLT MANUAL SPLIT IS 200 LBS MAX. BOOST PUMP AND XFEED ACTIONS MADE NO IMPACT ON 300 LBS SPLIT. DECLARED AN EMER AT IAD FOR FUEL TANK IMBALANCE, LANDED SAFELY, CHKLISTS USED AT ALL TIME.

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.