Not positive that they were receiving a false warning, the crew of a B737 diverts to another airport after receiving an APU fire warning at FL350 on frequency with ZTL.

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Attributes
ACN	622345
Time
Date	200309
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ztl.artcc
State Reference	GA
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 20000 flight time type : 14000
ASRS Report	622345
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 9000
ASRS Report	622346
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : apu fire wng other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed as precaution flight crew : diverted to another airport other
Consequence	faa : reviewed incident with flight crew other other Other
Supplementary
Problem Areas	Maintenance Human Performance Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Approximately 1 hour 45 mins into flight at cruise altitude at FL350, fire warning horn sounded with an APU fire handle light and fire control panel fault light on. APU was shut down on the ground after engine start. Proceeded according to QRH and contacted maintenance through dispatcher. With no help from maintenance APU fire handle was pulled and fire bottle was discharged. Light remained on and ZTL was contacted for divert to atl. Center stated no delays to atl, normal spacing. Proceeded to normal landing at atl. Maintenance met aircraft, placarded APU inoperative after inspection and flight continued on to destination. Supplemental information from an 622346: APU fire warning system activated with the APU shut down and verified with switch position, APU egt, no volts frequencys and all other system normal. Tested the system and showed a fault, got the QRH out and called maintenance control.

Original NASA ASRS Text

Title: NOT POSITIVE THAT THEY WERE RECEIVING A FALSE WARNING, THE CREW OF A B737 DIVERTS TO ANOTHER ARPT AFTER RECEIVING AN APU FIRE WARNING AT FL350 ON FREQ WITH ZTL.

Narrative: APPROX 1 HR 45 MINS INTO FLT AT CRUISE ALT AT FL350, FIRE WARNING HORN SOUNDED WITH AN APU FIRE HANDLE LIGHT AND FIRE CTL PANEL FAULT LIGHT ON. APU WAS SHUT DOWN ON THE GND AFTER ENG START. PROCEEDED ACCORDING TO QRH AND CONTACTED MAINT THROUGH DISPATCHER. WITH NO HELP FROM MAINT APU FIRE HANDLE WAS PULLED AND FIRE BOTTLE WAS DISCHARGED. LIGHT REMAINED ON AND ZTL WAS CONTACTED FOR DIVERT TO ATL. CTR STATED NO DELAYS TO ATL, NORMAL SPACING. PROCEEDED TO NORMAL LNDG AT ATL. MAINT MET ACFT, PLACARDED APU INOP AFTER INSPECTION AND FLT CONTINUED ON TO DEST. SUPPLEMENTAL INFO FROM AN 622346: APU FIRE WARNING SYS ACTIVATED WITH THE APU SHUT DOWN AND VERIFIED WITH SWITCH POS, APU EGT, NO VOLTS FREQS AND ALL OTHER SYS NORMAL. TESTED THE SYS AND SHOWED A FAULT, GOT THE QRH OUT AND CALLED MAINT CTL.

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.