# Presentation: 722393

**Improvement of Smoke Warning Reliability ****in Aircraft Applications**
-  International Aircraft Systems Fire Protection Working GroupMeeting in Bremen on May 3/4th, 2000

**Fire Protection Fuselage **

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## 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)

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## 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 ifenhanced fire recognition and confirmation procedures are used within the sensors/systems

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning 

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

- Fire Parameter 1
-      Fire Parameter 2

**Non – fire case:**
- Several Parameters (e.g. radiation,dust, gases) vary due to environmental conditions.

**t [e.g. in seconds]**

**Fire case:**
- Parameters develop typically.In Multisensors, Signals are being calculatedover a certain period of time

**t**

**Sensor Signal**

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## Proposal

**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 Fh

**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

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## Fire Protection Fuselage

**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

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2

## Application Example: Recognition of smouldering fires in power plants

**Fire Protection Fuselage **Improvement of Cargo Compartment Smoke Warning

- 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 dueto gradient evolution

- Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000

- Klaus Schmoetzer, Dept. ESM2