A B737-300 captain, departing mci, rejected the takeoff after the master caution sounded.

Attributes
ACN	585625
Time
Date	200306
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mci.airport
State Reference	MO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 13000 flight time type : 6000
ASRS Report	585625
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : warning hyd system light other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Takeoff roll was discontinued when system 'a' electric hydraulic pump 'overheat' light illuminated during spool-up. Takeoff was abandoned at 60-65 KTS. Light extinguished as we cleared the runway. Returned to the gate and maintenance troubleshot for awhile, only to defer the light. All appeared to go as planned. This report is submitted in conjunction with corresponding irregularity report in support of as soon as possible research.

Original NASA ASRS Text

Title: A B737-300 CAPT, DEPARTING MCI, REJECTED THE TKOF AFTER THE MASTER CAUTION SOUNDED.

Narrative: TKOF ROLL WAS DISCONTINUED WHEN SYS 'A' ELECTRIC HYD PUMP 'OVERHEAT' LIGHT ILLUMINATED DURING SPOOL-UP. TKOF WAS ABANDONED AT 60-65 KTS. LIGHT EXTINGUISHED AS WE CLRED THE RWY. RETURNED TO THE GATE AND MAINT TROUBLESHOT FOR AWHILE, ONLY TO DEFER THE LIGHT. ALL APPEARED TO GO AS PLANNED. THIS RPT IS SUBMITTED IN CONJUNCTION WITH CORRESPONDING IRREGULARITY RPT IN SUPPORT OF ASAP RESEARCH.

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.