<< >> NASA ASRS Report 638011, October 2004

On taxi out, flight crew of B737 receive equipment cooling fan 'off' warning. Maintenance determines the fault is in the warning system.

Attributes
ACN	638011
Time
Date	200410
Day	Sat
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	638011
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Supplementary
Problem Areas	Aircraft Chart Or Publication
Primary Problem	Aircraft
Situations
Publication	Abnormal Checklist

Narrative:

After pushback, noticed 'equipment cooling exhaust off light' on. First officer and international relief officer instructed to work QRH page 15. Checklist accomplished, but off light remained on. I asked crew if they remembered system and after conferring with my cockpit panel notes, all agreed light should go out unless both fans are inoperative. Called in to maintenance and reference to MEL cleared things up and I was feeling we cold not take off. Maintenance met me at the deice pad and informed me the M-100 flow sensor stuck and both fans ok. He was able to un-stick sensor in east&east compartment and we all agreed ok to continue. Very disappointed that QRH not informative for my situation.

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Original NASA ASRS Text

Title: ON TAXI OUT, FLT CREW OF B737 RECEIVE EQUIP COOLING FAN 'OFF' WARNING. MAINT DETERMINES THE FAULT IS IN THE WARNING SYS.

Narrative: AFTER PUSHBACK, NOTICED 'EQUIP COOLING EXHAUST OFF LIGHT' ON. FO AND IRO INSTRUCTED TO WORK QRH PAGE 15. CHKLIST ACCOMPLISHED, BUT OFF LIGHT REMAINED ON. I ASKED CREW IF THEY REMEMBERED SYS AND AFTER CONFERRING WITH MY COCKPIT PANEL NOTES, ALL AGREED LIGHT SHOULD GO OUT UNLESS BOTH FANS ARE INOP. CALLED IN TO MAINT AND REF TO MEL CLRED THINGS UP AND I WAS FEELING WE COLD NOT TAKE OFF. MAINT MET ME AT THE DEICE PAD AND INFORMED ME THE M-100 FLOW SENSOR STUCK AND BOTH FANS OK. HE WAS ABLE TO UN-STICK SENSOR IN E&E COMPARTMENT AND WE ALL AGREED OK TO CONTINUE. VERY DISAPPOINTED THAT QRH NOT INFORMATIVE FOR MY SIT.

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.