<< >> NASA ASRS Report 543101, March 2002

A B737-800 rejected takeoff at 95 KTS due to engine master caution light. Bite test indicated pitot probe heat off. Probe heat was on. False warning.

Attributes
ACN	543101
Time
Date	200203
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Dawn
Aircraft 1
Controlling Facilities	tower : cvg.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 110 flight time total : 7200 flight time type : 1800
ASRS Report	543101
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : engine master caution other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : rejected takeoff
Consequence	other other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

At 90 KTS, received engine master caution light -- no other indications. Captain rejected takeoff at 95 KTS. Rejected takeoff checklist and after landing checklist completed and returned to gate. Bite test showed pitot probe heat switch off. Switch was confirmed on during after start checklist, visually by captain and first officer, and on before takeoff checklist recall check. Also, switches were physically turned off and on after landing checklist. Maintenance mentioned could have been a bit fault error. Have had fault errors before. Write-up was cleared by maintenance and we taxied out to runway for departure again.

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Original NASA ASRS Text

Title: A B737-800 REJECTED TKOF AT 95 KTS DUE TO ENG MASTER CAUTION LIGHT. BITE TEST INDICATED PITOT PROBE HEAT OFF. PROBE HEAT WAS ON. FALSE WARNING.

Narrative: AT 90 KTS, RECEIVED ENG MASTER CAUTION LIGHT -- NO OTHER INDICATIONS. CAPT REJECTED TKOF AT 95 KTS. REJECTED TKOF CHKLIST AND AFTER LNDG CHKLIST COMPLETED AND RETURNED TO GATE. BITE TEST SHOWED PITOT PROBE HEAT SWITCH OFF. SWITCH WAS CONFIRMED ON DURING AFTER START CHKLIST, VISUALLY BY CAPT AND FO, AND ON BEFORE TKOF CHKLIST RECALL CHK. ALSO, SWITCHES WERE PHYSICALLY TURNED OFF AND ON AFTER LNDG CHKLIST. MAINT MENTIONED COULD HAVE BEEN A BIT FAULT ERROR. HAVE HAD FAULT ERRORS BEFORE. WRITE-UP WAS CLRED BY MAINT AND WE TAXIED OUT TO RWY FOR DEP AGAIN.

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.