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MECHANICS / ELECTRICS & AVIONICS COURSE 26 FIRE PROTECTION
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26 - FIRE PROTECTION
26-13-00 SYSTEM PRESENTATION
CONTENTS:
General
Fire Detector
Fire Detection Unit (FDU)
Warnings
Test P/B
Auto Extinguishing
APU Fire P/B
Agent P/B
Bottle
Red Disc
Self Examination
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SYSTEM PRESENTATION
GENERAL
The APU fire protection is provided by two systems :
The fire detection system and the fire extinguishing
system.
FIRE DETECTOR
The fire detection system consists of two independent
loops (A and B). Each loop comprises one fire detector.
Loops A and B are connected in parallel to a Fire
Detection Unit (FDU).
FIRE DETECTION UNIT (FDU)
A Fire Detection Unit is provided for the APU. The
Fire Detection Unit (FDU) processes signals received
from the fire detectors.
WARNINGS
The Fire Detection Unit generates signals for ECAM
display, Centralized Fault Display System
utilization and cockpit local warnings.
- Fire warning signals are sent to ECAM, APU fire
panel and external power control panel when
aircraft is on ground.
- Loop failure warnings are sent to ECAM and
Centralized Fault Display System (CFDS).
TEST P/B
On the APU FIRE panel a TEST pushbutton permits the
fire detection and the extinguishing systems to be
checked. During the TEST, the SQUIB light comes on if
the continuity of the squib circuit is correct. The
DISCH light is also activated but as a lamp test.
The TEST pushbutton checks simultaneously the
integrity of:
- Fire detection loops A and B, FDU, indications
and warnings.
- Squib circuit continuity.
AUTO EXTINGUISHING
If an APU fire occurs while on ground, the APU is
automatically shutdown and the fire extinguishing
system automatically triggered.
APU FIRE P/B
When the APU FIRE PUSHbutton is released out:
- the SQUIB light comes on indicating bottle
percussion is available,
- and APU systems are isolated.
AGENT P/B
Action on the AGENT pushbutton provides bottle
discharge if the APU FIRE PUSHbutton is still released
out. A pressure switch activates the DISCH light when
the agent has been discharged.
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SYSTEM PRESENTATION
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SYSTEM PRESENTATION
BOTTLE
An extinguisher bottle is installed outside of the APU
compartment, forward of the firewall. The bottle is
equipped with a pressure switch to monitor agent
pressure and an electrically operated squib for agent
discharge.
RED DISC
A red disc is visible from outside. The absence of the
red disc indicates bottle overpressure discharge.
TMUFIRB02-T01 LEVEL 1
EFFECTIVITY 26-13-00 Page 4
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