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A B747-200 in cruise at FL330 had an APU fire warning light illuminate. Discharged APU fire bottle, warning light went out and both fire warning system tested ok. Aircraft had previous history of false APU fire warning light illuminating.
| Attributes | |
| ACN | 441004 |
| Time | |
| Date | 199906 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cmx.airport |
| State Reference | MI |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : czyz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : v140.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 100 |
| ASRS Report | 441004 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : apu fire warning anunciator |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Master fire warning light (red) and another unknown annunciator light (amber) on forward instrument panel flickered on rotation. At FL330 we got an APU fire warning light. Followed communication procedure. Immediately, upon discharging fire bottle, warning extinguished. Warning system subsequently tested normal (both loops). Contacted dispatch, maintenance control and chief pilot. Aircraft had a history of APU problems, including loop 'a' in dual fire loop ('or' logic). APU had not operated for 1 hour at time of warning. It is in an unpressurized compartment. Our decision was to continue to destination.
Original NASA ASRS Text
Title: A B747-200 IN CRUISE AT FL330 HAD AN APU FIRE WARNING LIGHT ILLUMINATE. DISCHARGED APU FIRE BOTTLE, WARNING LIGHT WENT OUT AND BOTH FIRE WARNING SYS TESTED OK. ACFT HAD PREVIOUS HISTORY OF FALSE APU FIRE WARNING LIGHT ILLUMINATING.
Narrative: MASTER FIRE WARNING LIGHT (RED) AND ANOTHER UNKNOWN ANNUNCIATOR LIGHT (AMBER) ON FORWARD INST PANEL FLICKERED ON ROTATION. AT FL330 WE GOT AN APU FIRE WARNING LIGHT. FOLLOWED COM PROC. IMMEDIATELY, UPON DISCHARGING FIRE BOTTLE, WARNING EXTINGUISHED. WARNING SYS SUBSEQUENTLY TESTED NORMAL (BOTH LOOPS). CONTACTED DISPATCH, MAINT CTL AND CHIEF PLT. ACFT HAD A HISTORY OF APU PROBS, INCLUDING LOOP 'A' IN DUAL FIRE LOOP ('OR' LOGIC). APU HAD NOT OPERATED FOR 1 HR AT TIME OF WARNING. IT IS IN AN UNPRESSURIZED COMPARTMENT. OUR DECISION WAS TO CONTINUE TO DEST.
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.