B757 flight crew has autothrottle fail to advance on takeoff. Takeoff aborted.

Attributes
ACN	347991
Time
Date	199609
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mex
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	347991
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Location: mex airport. Aborted takeoff runway 05L. After arming autothrottles and selecting EPR throttles advanced. Right throttle stopped at 1.4 EPR, left throttle continued to advance. Throttles were pulled back, aborted takeoff executed from 80 KTS. No brakes were used. Autothrottle system on right was in a test mode which prevented the throttle from advancing beyond 1.4 EPR. Maintenance had worked on the engine in mex to fix an engine vibration. Logbook does not indicate the test mode was engaged. Autothrottles were placarded inoperative. Aircraft was taken to run-up area to check out engine. Passenger were not on board. Engines ran up to takeoff power. Flight home was normal but late.

Original NASA ASRS Text

Title: B757 FLC HAS AUTOTHROTTLE FAIL TO ADVANCE ON TKOF. TKOF ABORTED.

Narrative: LOCATION: MEX ARPT. ABORTED TKOF RWY 05L. AFTER ARMING AUTOTHROTTLES AND SELECTING EPR THROTTLES ADVANCED. R THROTTLE STOPPED AT 1.4 EPR, L THROTTLE CONTINUED TO ADVANCE. THROTTLES WERE PULLED BACK, ABORTED TKOF EXECUTED FROM 80 KTS. NO BRAKES WERE USED. AUTOTHROTTLE SYS ON R WAS IN A TEST MODE WHICH PREVENTED THE THROTTLE FROM ADVANCING BEYOND 1.4 EPR. MAINT HAD WORKED ON THE ENG IN MEX TO FIX AN ENG VIBRATION. LOGBOOK DOES NOT INDICATE THE TEST MODE WAS ENGAGED. AUTOTHROTTLES WERE PLACARDED INOP. ACFT WAS TAKEN TO RUN-UP AREA TO CHK OUT ENG. PAX WERE NOT ON BOARD. ENGS RAN UP TO TKOF PWR. FLT HOME WAS NORMAL BUT LATE.

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.