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A B737 APU fire warning sounded at 15000 ft after being turned off during taxi before takeoff. The egt was normal; a false warning is assumed.
| Attributes | |
| ACN | 784502 |
| Time | |
| Date | 200804 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 230 flight time type : 230 |
| ASRS Report | 784502 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : apu fired warning other flight crewa |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Passing 15000 ft on initial climb out from ZZZ; we received an APU fire warning. We had shut down the APU during taxi in accordance with the checklist. We leveled off; complied with the checklist; and returned to ZZZ. The fire light went out about 3 mins after we discharged the APU fire bottle; then came on again during recovery. We declared an emergency and coordination with our cabin crew to try and determine if there were any actual indications of fire. The APU egt appeared normal for a shutdown APU. This appears to have been a false indication.
Original NASA ASRS Text
Title: A B737 APU FIRE WARNING SOUNDED AT 15000 FT AFTER BEING TURNED OFF DURING TAXI BEFORE TKOF. THE EGT WAS NORMAL; A FALSE WARNING IS ASSUMED.
Narrative: PASSING 15000 FT ON INITIAL CLBOUT FROM ZZZ; WE RECEIVED AN APU FIRE WARNING. WE HAD SHUT DOWN THE APU DURING TAXI IN ACCORDANCE WITH THE CHKLIST. WE LEVELED OFF; COMPLIED WITH THE CHKLIST; AND RETURNED TO ZZZ. THE FIRE LIGHT WENT OUT ABOUT 3 MINS AFTER WE DISCHARGED THE APU FIRE BOTTLE; THEN CAME ON AGAIN DURING RECOVERY. WE DECLARED AN EMER AND COORD WITH OUR CABIN CREW TO TRY AND DETERMINE IF THERE WERE ANY ACTUAL INDICATIONS OF FIRE. THE APU EGT APPEARED NORMAL FOR A SHUTDOWN APU. THIS APPEARS TO HAVE BEEN A FALSE INDICATION.
Data retrieved from NASA's ASRS site as of May 2009 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.