Pneumatic Sensor Element
 Figure 003
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 -an APU FIRE pushbutton with a red integral warning light. It is guarded red.
 -a TEST pushbutton for a manual system test,
 -an AGENT pushbutton with a white integral light SQUIB and an amber light DISCH. (Ref. 26-22-00)
R 4. Interface_________ (Ref. Fig. 002) The APU Fire Detection System has interfaces with these systems:
 -electrical power, (Ref 24-00-00)
 -APU fire extinguishing WF, (Ref 26-22-00)
 -Centralized Fault Display Interface (CFDUI) TW, (Ref 31-32-00)
 -FWS - Acquisition/Interface WW, (Ref 31-52-00)
 -Steering GB, (Ref 32-50-00)
 -Annunciator Light Test and Dimming LP, (Ref 33-14-00)
R 5. Operation_________
 A. System Operation
 (Ref. Fig. 004)

 (1) Fire Warnings
 (a)
 Fire warning conditions Fire warnings are shown on the Fire Panel, ECAM and Master Warning Lights (also a repetetive chime). The warnings appear at loop conditions:

 -
Fire A and Fire B,

 -
Fire A and Fault B,

 -
Fault A and Fire B,

 -
Fault A and Fault B within 5 sec.

 (b)
 Fire warnings on ground
 On fire control panel 20VU:

 -
the red light in the APU FIRE pushbutton switch flashes, On glareshield panels 130VU and 131VU:

 -
the red light in the two MASTER WARNING pushbuttons flash,

 -a repetetive chime sounds.
 On panel 108VU:

 Logic - Detector FAULT Warning.
 Figure 004

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 -
the red APU FIRE indication light comes on,

 -
the external horn sounds.

 (c)
 Fire warnings in flight
 On fire control panel 20VU:

 -
the red light in the APU FIRE pushbutton switch flashes. On glareshield panel 130VU and 131VU:

 -
the red light in the two MASTER WARNING pushbuttons flash,

 -a repetetive chime sounds.

 (d)
 Messages
 On ECAM engine and warning display appear:

 -
APU FIRE,

 -
APU FIRE P/B ... PUSH,

 -AGENT AFT 10 S ... DISCH (automatic countdown),
 -MASTER SW ... OFF,
 On ECAM system display:

 -APU page is called up automatically.
 (2)
 Loop Fault Warnings

 (a)
 Loop fault warnings are provided, when one loop has:

 -a fault in the detector or in the detection circuit,
 -an electrical power failure,
 -a fire signal for more than 15 sec.

 (b)
 Loop Fault message on ECAM engine and warning display:

 -FIRE APU LOOP A or B FAULT.

 (3)
 Detector Fault Warnings

 (a)
 APU detector fault warning is provided when both loops are faulty.

 (b)
 Detector fault warnings on glareshield 130VU and 131VU:

 -the amber light in the two MASTER CAUTION pushbuttons flash,
 -a single chime sounds.

 (c)
 Message on ECAM engine and warning display:

 -FIRE APU DET FAULT.

 (4)
 System Test A test pushbutton checks the integrity of:

 -fire detection loop A and B,
 -FDU,
 -indications,
 -warnings,
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 -associated wirings,

 -fire extinguisher bottle, (Ref. 26-22-00)
 When the fire warnings come on, the result of the test is correct.

 B. Component Operation
 (1) Fire Sensor Elements (Ref. Fig. 003) Increased overall or local temperature causes a fire signal in each sensor element.
 (a)
 Increased overall temperature The detector element operates with pressure. A rise of the temperature increases the pressure in the detector. The sensor tube contains a fixed volume of inert helium gas. If the sensor senses an overall temperature increase, its internal gas pressure increases proportionally. When the alarm temperature (pressure) is reached, it closes the pressure actuated alarm switch. The point to find an overheat of the entire area is between 202 DEG.C

 (395.60 DEG.F) and 178 DEG.C (352.40 DEG.F).

 (b)
　
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