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B777 captain reported responding to a lwr aft cargo fire warning by discharging extinguishing agent into the cargo bay while parked at the gate. Crew was advised the warning was triggered by ground personnel placing an insecticide spray bottle in the compartment.
| Attributes | |
| ACN | 1717536 |
| Time | |
| Date | 202001 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Ground Event / Encounter Other / Unknown |
Narrative:
After shutting down both engines in the gate we got a 'lwr aft cargo' fire warning. We ran the checklist and discharged the fire suppressant. I then asked ramp personnel if there was any sign of fire or smoke near the lower aft cargo door. They said no. I was then informed that one of the ramp workers had opened the lower aft cargo door; placed an insecticide spray bottle in the bay; and then closed the door. The resulting mist is what set off the fire alarm. There was never any actual smoke or fire. I then notified maintenance and wrote up the aml.placing an activated insecticide spray bottle in the cargo compartment; which tricked the system into thinking there was smoke in the bay; when in fact it was simply the mist from the insecticide bottle.have the ramp agents tell the crew they are about to place an activated insecticide spray bottle in the cargo compartment; and might get a fire alarm. The crew can then monitor the EICAS for any alarms. If an alarm occurs; the crew can then verify with ramp personnel there is no actual smoke emanating from the lower aft cargo bay; and decide whether or not to run the checklist and discharge the fire suppressant.
Original NASA ASRS Text
Title: B777 Captain reported responding to a LWR AFT CARGO fire warning by discharging extinguishing agent into the cargo bay while parked at the gate. Crew was advised the warning was triggered by Ground Personnel placing an insecticide spray bottle in the compartment.
Narrative: After shutting down both engines in the gate we got a 'LWR AFT CARGO' fire warning. We ran the checklist and discharged the fire suppressant. I then asked ramp personnel if there was any sign of fire or smoke near the lower aft cargo door. They said no. I was then informed that one of the ramp workers had opened the lower aft cargo door; placed an insecticide spray bottle in the bay; and then closed the door. The resulting mist is what set off the fire alarm. There was never any actual smoke or fire. I then notified Maintenance and wrote up the AML.Placing an activated insecticide spray bottle in the cargo compartment; which tricked the system into thinking there was smoke in the bay; when in fact it was simply the mist from the insecticide bottle.Have the ramp agents tell the crew they are about to place an activated insecticide spray bottle in the cargo compartment; and might get a fire alarm. The crew can then monitor the EICAS for any alarms. If an alarm occurs; the crew can then verify with ramp personnel there is no actual smoke emanating from the lower aft cargo bay; and decide whether or not to run the checklist and discharge the fire suppressant.
Data retrieved from NASA's ASRS site 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.