GLF4 crew was unable to control #1 engine in ZAU class a airspace.

Attributes
ACN	479843
Time
Date	200007
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : multi engine pilot : commercial pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 500
ASRS Report	479843
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Corporately owned/operated giv began descent into awk. Autothrottles disengaged due to split in engine power. Subsequently unable to reduce engine power on left engine below 85% power. Destination was pwk 100 ft by 5000 ft runway. Diverted to ord. Engine stuck at 85%, power would not reduce. Advised ATC of 'expeditious handling' to ord due to engine malfunction. Because of abnormally high power setting, unable to slow the aircraft enough to configure the aircraft for landing or land. Therefore, had to shut down left engine. Made approach and landing at ord, which were uneventful. Thanks to ATC expeditious handling of our situation, an 'emergency' was not declared, but we (crew) made it clear we had a problem and that we needed no delay to the field. ATC did an outstanding job. Upon inspection by maintenance personnel, suspect faulty fuel control unit on left engine.

Original NASA ASRS Text

Title: GLF4 CREW WAS UNABLE TO CTL #1 ENG IN ZAU CLASS A AIRSPACE.

Narrative: CORPORATELY OWNED/OPERATED GIV BEGAN DSCNT INTO AWK. AUTOTHROTTLES DISENGAGED DUE TO SPLIT IN ENG PWR. SUBSEQUENTLY UNABLE TO REDUCE ENG PWR ON L ENG BELOW 85% PWR. DEST WAS PWK 100 FT BY 5000 FT RWY. DIVERTED TO ORD. ENG STUCK AT 85%, PWR WOULD NOT REDUCE. ADVISED ATC OF 'EXPEDITIOUS HANDLING' TO ORD DUE TO ENG MALFUNCTION. BECAUSE OF ABNORMALLY HIGH PWR SETTING, UNABLE TO SLOW THE ACFT ENOUGH TO CONFIGURE THE ACFT FOR LNDG OR LAND. THEREFORE, HAD TO SHUT DOWN L ENG. MADE APCH AND LNDG AT ORD, WHICH WERE UNEVENTFUL. THANKS TO ATC EXPEDITIOUS HANDLING OF OUR SIT, AN 'EMER' WAS NOT DECLARED, BUT WE (CREW) MADE IT CLR WE HAD A PROB AND THAT WE NEEDED NO DELAY TO THE FIELD. ATC DID AN OUTSTANDING JOB. UPON INSPECTION BY MAINT PERSONNEL, SUSPECT FAULTY FUEL CTL UNIT ON L ENG.

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.