Medium large transport aircraft on STAR had right throttle go to idle while left one was at 88% N1. That caused the aircraft to turn right. Captain turned off autoplt and autothrottles and turned back on course.

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Attributes
ACN	394384
Time
Date	199802
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lga
State Reference	NY
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : n90
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 191 flight time total : 16530 flight time type : 5356
ASRS Report	394384
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Descending on minks arrival into lga, approaching minks intersection, captain flying aircraft. Flight director V bars indicating a left turn as aircraft levels off. Aircraft starts turning to right, going through about 30 degrees right bank. Captain disengages autoplt and autothrottles. Aircraft turned left manually to return to proper heading. During turn, notice that left thrust lever indicating 88% N1, right thrust lever at idle. Set symmetrical thrust and continue for landing at lga. Automatic throttle was written up upon arrival at lga.

Original NASA ASRS Text

Title: MLG ACFT ON STAR HAD R THROTTLE GO TO IDLE WHILE L ONE WAS AT 88% N1. THAT CAUSED THE ACFT TO TURN R. CAPT TURNED OFF AUTOPLT AND AUTOTHROTTLES AND TURNED BACK ON COURSE.

Narrative: DSNDING ON MINKS ARR INTO LGA, APCHING MINKS INTXN, CAPT FLYING ACFT. FLT DIRECTOR V BARS INDICATING A L TURN AS ACFT LEVELS OFF. ACFT STARTS TURNING TO R, GOING THROUGH ABOUT 30 DEGS R BANK. CAPT DISENGAGES AUTOPLT AND AUTOTHROTTLES. ACFT TURNED L MANUALLY TO RETURN TO PROPER HDG. DURING TURN, NOTICE THAT L THRUST LEVER INDICATING 88% N1, R THRUST LEVER AT IDLE. SET SYMMETRICAL THRUST AND CONTINUE FOR LNDG AT LGA. AUTO THROTTLE WAS WRITTEN UP UPON ARR AT LGA.

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.