Aircraft equipment problem on takeoff procedure.

Attributes
ACN	271987
Time
Date	199405
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5600 flight time type : 800
ASRS Report	271987
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On takeoff roll at lax, autothrottle or FMC computer did not reach the takeoff computed north of 90.6 percent. Instead, takeoff thrust seemed to stabilize slightly below at 88.8 percent to north (on both engines). The first officer manually advanced both throttles and was able to achieve desired takeoff thrust on both engines. Normal acceleration and climb were achieved. Upon arrival in denver, the discrepancy between desired and actual takeoff was written up and maintenance was advised.

Original NASA ASRS Text

Title: ACFT EQUIP PROB ON TKOF PROC.

Narrative: ON TKOF ROLL AT LAX, AUTOTHROTTLE OR FMC COMPUTER DID NOT REACH THE TKOF COMPUTED N OF 90.6 PERCENT. INSTEAD, TKOF THRUST SEEMED TO STABILIZE SLIGHTLY BELOW AT 88.8 PERCENT TO N (ON BOTH ENGS). THE FO MANUALLY ADVANCED BOTH THROTTLES AND WAS ABLE TO ACHIEVE DESIRED TKOF THRUST ON BOTH ENGS. NORMAL ACCELERATION AND CLB WERE ACHIEVED. UPON ARR IN DENVER, THE DISCREPANCY BTWN DESIRED AND ACTUAL TKOF WAS WRITTEN UP AND MAINT WAS ADVISED.

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.