26-15-00
 ALL  ú ú 04 Page 5 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
LP 1 ALARM
LP 1 FAULT
400 HZ
OSCILLATOR

POWER
SUPPLY

LOOP 1 APU FIRE DETECTOR CARD
28V DC
TEST RELAYENG/APU/CARGO
AIR
TEST SWITCH
GND
AIR/GND RELAY
LP 2 ALARM TEST
INTERNALS
SAME AS

LP 2 FAULT TESTLOOP 1 APUFIRE DETECTORLP 2 ALARMCARDLP 2 FAULT
LOOP 2 APU FIRE DETECTOR CARD
APU Fire Detection Schematic
Figure 2 (Sheet 1)

APU FIRE LP 1 (W)FIRE/OVHT SYS (Y)APU FIRE (R)APU FIRE LP 2 (W)L/R EICAS COMPUTERS
RV+
+28V
DCAPU FIRESWITCHUNLOCK
NORMAL
FIREAPU FIRE SW
A +V
FAILP-RESET
FAIL LIGHTOFF
ON
MAIN BATTERY
SWITCH

ON
OFF
APU START SW

NORMAL
TESTTEST RELAY U+
U+
WR
E
"FIRE"

UFLT DK FIRE
L
DISCRETE BELL
ODISPLAYWARNING
GI
U+
C R
"WARNING"
WARN ELECUNIT PILOTS GLRSHLDPANEL
+28VSQUIB
DC
APU FIRE EXT
APU REMOTE

BOTTLE
WARNING
RELAY

R
APU FIRELIGHT
APU FIREWARNING HORN
APU BTL
INTERRUPT

APU HORN
DISCH SW
RELAY

APU SHUTDOWN/CUTOUT SW
APU NOSE GEARPANEL
GND
AIR
AIR/GND RELAY APUSHUTDOWNSIGNAL
EXTERNAL
SHUTDOWN RELAY

28V DC T D
APU FIRE RELAY
LOOP 1
LOOP 1UPPER
LOWER DET
DET LOOP 1 FIRE DETECTORS
28V DC
R BUS
FIRE DET
ALT PWR APU
28V DC
FIRE DET
BATAPU 1BUSFIRE DET
APU 2P11
INTERNALS
SAME AS
LOOP 1
FIRE
DETECTORS

LOOP 2 FIRE DETECTORS
28V DC
HOT BAT
BUSFIRE EXT APU

P6
28V DC
BAT BUS
REMOTE FIRE
IND APU

P11
POWER
SUPPLY

POWER-
UP TEST

TESTCONF
SEQUENCER LATCH

SET RESET MANUAL
TEST
AUTOMATIC FIRE/OVHT LOGIC TEST CARD (AFOLTS) APU FUELCNTL RELAYAPU BOTTLEDISC RELAY
A
757
MAINTENANCE MANUAL

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH GRAVINER FIRE DETECTION ú

 26-15-00
 SYSTEMS  ú ú 06 Page 6 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A72134
A
757
MAINTENANCE MANUAL

U+
U+
W R
E
"FIRE"

U FLT DK FIRE
L
DISCRETE BELL
O DISPLAYWARNING
GI
U+
C R
"WARNING"
WARN ELECUNIT PILOTS GLRSHLDPANEL
+28V SQUIB
DC
APU FIRE EXT
APU REMOTE

BOTTLE
WARNING
RELAY

R
APU FIRELIGHT
APU FIREWARNING HORN
APU BTL
INTERRUPT

APU HORN
DISCH SW
RELAY

APU SHUTDOWN/CUTOUT SW
APU NOSE GEARPANEL
GND
AIR
AIR/GND RELAY APUSHUTDOWNSIGNAL
EXTERNAL
SHUTDOWN RELAY

28V DC T D
APU FIRE RELAY
<80 OHM APU FIRE LP 1 (W)
TRIP POINT ALARM FIRE/OVHT SYS (Y)
>1.73K
ALARM

INTEGRITY
APU FIRE (R)SW OHM FAULT APU FIRE LP 2 (W)
N.O.
40 PSI
3K

3K CONTAMINATION L/R EICAS COMPUTERS
80 TO
FAULT
1.3K OHM

10 MS
INTEGRITY
SW

7 PSI RV+
N.C.
POWER
SUPPLY

+28V
LOOP 1 LOOP 1

DC
UPPER DET LOWER DET
APU FIRE

LOOP 1 FIRE DETECTORS LOOP 1 APU FIRE DETECTOR CARD SWITCHUNLOCK
NORMAL
28V DC

FIRE DET
POWER
BAT APU 2
SUPPLY
BUSFIRE FIRE DETAPU FIRE SW
POWER-
28V DC

APU 1
UP TEST
R BUS
FIRE DET

A +V
ALT PWR APU
P11TEST CONF.
FAIL SEQUENCER LATCH
P-RESET
SET RESET ENG/APU/CARGOTEST SWITCH
MANUAL
FAIL LIGHT
TEST
OFF
LP 2 ALARM TEST INTERNALS
INTERNALS
ON SAME AS LP 2 FAULT TEST
SAME AS
LOOP 1 APU
MAIN BATTERYFIRE DETECTOR LP 2 ALARM
LOOP 1
　
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