Engine 1(2) Fire Extinguishing Circuit - Schematic
Figure 006
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When you press the TEST pushbutton switch, the FIRE warning indications are triggered and you check the condition of the fire extinguishing system:
- on the AGENT 1 and AGENT 2 pushbutton switches:
. lighting of the SQUIB legend,
(only if the two filaments are normally power supplied)
. lighting of the amber DISCH legend, (checking of the lamps only).
-electrical supply of the two filaments of each cartridge
NOTE : Although only one filament is sufficient to enable the firing of
____ the cartridge, the test will be positive only if the two filaments are electrically supplied. The test current is limited to 80 mA by the test module whereas the firing current is 5A.
If the failure is detected during the test sequence, a fault message comes into view in the ECAM (For example ENG 1 (2) LOOP A(B) FAULT).
B. Built-In Test Equipment (BITE)
This function is specified in the ATA chapter 26-12-00 (Para. 8.
BITE/Test).
C. Test of the Pressure Switch (Ref. Fig. 007)
The pressure switch on the fire extinguisher bottle has a manual test device. An hexagonal wrench is required to do the test.
The manual test checks the condition of the electrical contact. Rotation of the test screw opens the contact (continuity between pins 1 and 3): the DISCH legend on the AGENT 1(2) comes on.
In the rest position, the DISCH legend goes off.
NOTE : P > minimum pressure = continuity between pins 2 and 3
____
P < minimum pressure = continuity between pins 1 and 3.
Pressure Switch of the Fire Extinguisher Bottle
Figure 007
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ENGINE FIRE EXTINGUISHING - DEACTIVATION/REACTIVATION
_____________________________________________________
TASK 26-21-00-040-001
Bottle Pressure Check
1. Reason for the Job
__________________
Refer to the MMEL TASK: 26-21-01
Engine Fire Extinguishing
Agent 1 & 2 "DISCH" Light
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
No specific circuit breaker(s) safety clip(s)
R No specific multimeter No specific warning notice No specific Allen wrench (3/32 in. hex key) No specific access platform 1.6 m (5 ft. 3 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 26-12-00-710-001 Operational Check of Loop/Squib 26-21-41-280-001 Weight Check of the Engine Fire-Extinguisher Bottle (6WE1,6WE2,8WE1,8WE2) 26-21-00-991-006 Fig. 401
3. Job Set-up
__________
Subtask 26-21-00-865-054
A. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 6WE1, 6WE2
121VU ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B 2WE1 Q44 121VU ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A 1WE1 Q43
FOR 8WE1, 8WE2 121VU ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B 2WE2 Q42 121VU ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A 1WE2 Q41
Subtask 26-21-00-941-063
B. Safety Precautions
(1)
On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2)
Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3)
On the overhead maintenance panel 50VU:
(a)
Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b)
Put a warning notice to tell persons not to energize the FADEC 1(2).
(4) Put the access platform in position below the pylon. Subtask 26-21-00-010-065
C. Get Access
(1)
FOR 6WE1, 8WE1
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