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Minimum/Maximum FIREX Bottle Pressure (4.3 lb nominal weight)
Gage reading (psig)
Temp °C Minimum Maximum
-55 251 343
-50 277 354
-45 288 367
-40 302 380
-35 315 394
-30 330 410
-25 347 427
-20 365 445
-15 384 465
-10 404 486
-5 427 508
0 450 533
5 476 559
10 503 587
15 532 616
20 578 648
25 596 681
30 631 717
35 668 755
40 708 795
45 750 838
50 796 886
55 849 941
60 895 982
65 964 1096
70 1032 1165
75 1100 1235
80 1168 1305
85 1235 1375
90 1303 1445
95 1371 1515
100 1439 1585
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
09-01-07 AUXILIARY POWER UNIT FIRE PROTECTION
DESCRIPTION
The auxiliary power unit (APU) fire detection system functions by detecting an overheat condition within the APU enclo-sure. An APU fire can only be extinguished from bottle No. 2.
The APU fire protection has a ground mode for unattended operation and a flight mode.
On the ground, when a condition is detected, the APU shuts down automatically. Five seconds later, the APU fire bottle automatically discharges Halon into the APU enclosure.
In flight, when a fire condition is detected and the APU FIRE switch is pushed, the APU shuts down and arms the discharge cartridge on the number 2 container. The flight crew must discharge the bottle by pushing the FIRE EXT 2 switch.
FIREX
CONTROL APU APU FIRE
UNIT FLIGHT COMPARTMENT ECU APU SHUT DOWN
APU
ENGINE
FIRE
L ENG FIRE R ENG FIRE
APU FIRE
FIRE FIRE
FIRE
1 FIRE EXT 2
EVENT
FIRE ELEMENT
ARMED ARMED
AUTO AUTO APR
SYNC MACH HOLD N1 OFF OFF
N2 ON
L STARTER
R STARTER OFF OFF IGNITION
START START CRANK CRANK
ON
APU
APU COMPARTMENT
COMPONENTS AND OPERATION
DETECTION LOOPS
The APU enclosure is fitted with dual fire detection loops. The loops are connected to the fire detection and extinguishing control unit. The loops are constructed of an outer metal sheathing and two internal wires that are separated by an insulating material (thermistor). One of the wires carries electrical current, the other is grounded to the outer sheathing at the control unit. The resistance of the thermistor decreases with an increase in temperature.
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