Smoke by n9P0aK

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									Fire Protection Fuselage




                     Improvement of Smoke Warning Reliability
                             in Aircraft Applications




     International Aircraft Systems Fire Protection Working
                              Group
             Meeting in Bremen on May 3/4th, 2000
Klaus Schmoetzer, Dept. ESM2   Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000   Blatt: 1
Fire Protection Fuselage
Improvement of Cargo Compartment Smoke Warning



                               Problem
                                False Cargo Compartment Smoke Warnings

                               Consequences
                               • Fire Extinguishing activation
                               • Land ASAP
                               • eventually Evacuation
                               • AOG Case (Empty Fire Extinguishing Bottles)




Klaus Schmoetzer, Dept. ESM2             Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000   Blatt: 2
Fire Protection Fuselage
Improvement of Cargo Compartment Smoke Warning


 Analysis
 • Non - fire case in the aircraft is not fully understood.
   The way to improve this is to identify relevant parameters for fire
   and non fire
 • More detection time (>60 seconds) could be necessary to check
   the warning    situation and to confirm a fire
 • With a more reliable detection/signaling an increased level of
   safety can be reached

 Proposal
 Expand max. detection time of 60 seconds to approx 2 minutes
   if
  enhanced fire recognition and confirmation procedures are used
  within the sensors/systems



Klaus Schmoetzer, Dept. ESM2   Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000   Blatt: 3
Fire Protection Fuselage
Improvement of Cargo Compartment Smoke Warning


                  Potentials for new fire detection instruments
                  System needs internal evaluation time to confirm sensor signals

                        Evaluation time window                                       Evaluation time window
  Sensor Signal




                                             Fire Parameter 1
                                                 Fire Parameter 2


                       t [e.g. in seconds]                                                              t

                  Non – fire case:                                             Fire case:
                  Several Parameters (e.g. radiation,                          Parameters develop typically.
                  dust, gases) vary due to environmental                       In Multisensors, Signals are being calculated
                  conditions.                                                  over a certain period of time

Klaus Schmoetzer, Dept. ESM2                 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000                 Blatt: 4
Fire Protection Fuselage
Improvement of Cargo Compartment Smoke Warning


    Smoke Warning Reliability
    Improvement of Cargo Compartment Smoke Warning


               Problem         False Cargo Compartment Smoke Warning

          Consequences         Fire Extinguishing activation, land ASAP, eventually Evacuation, AOG

           Background          A330/340 Data: FLT phase: 25 Warnings / 2 real ones in 2.160.165

              Analysis         Non - fire case in aircraft application is not fully understand
                               Max. Detection Time of 60 seconds is not always sufficient



            Proposal           Expansion of max. detection time of 60s under certain conditions




Klaus Schmoetzer, Dept. ESM2      Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000    Blatt: 5
Fire Protection Fuselage




                                    For further information contact

                                  DaimlerChrysler Aerospace Airbus
                                       Klaus Schmoetzer, ESM2
                                         Systems Engineering
                                                Head of
                               Fire Protection and Conveyance Systems
                                       28183 Bremen / Germany
                                     Phone: +49(0)421 538 2856
                                     Fax : +49(0)421 538 5031
                               e-mail: klaus.schmoetzer@airbus.dasa.de




Klaus Schmoetzer, Dept. ESM2    Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000   Blatt: 6
Fire Protection Fuselage
Improvement of Cargo Compartment Smoke Warning

 Application Example: Recognition of smouldering fires in power
 plants

     Absolute Signal of two
     Sensors (SCO, SH2):
     High fluctuation due to
     variation in air flows


     Ratio of the two
     Sensors grows steadily.

     Decision no fire /fire due
     to gradient evolution




Klaus Schmoetzer, Dept. ESM2   Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000   Blatt: 7
 issue 1 // Date: 02-MAY-2000   Blatt: 7

								
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