MODE 2 WARNING
ADC-1ON
DETECTORP18 LOAD CONTROL CENTER
AUTO
XFMR FLASHERA13NC
A
MASTER DIM SWITCH (P2)B27G
D30928V DC INDICATOR LIGHTS
MODE 3 WARNING
X A14A36MACH
BARO VALIDB42DETECTOREVENT
1
o o
Y A15A37NUMBERPUSH TO
SIGNALB25NC
AIRSPEED h B
Z A16A38PROCESSORINHIBIT
CONTROL
DIFFERENTIATOR MODE 4 WARNING
BARO
3
H A60B37o
A A
DETECTOR DC
ALTITUDEh B
BARO RATEBELOW
C A61B38
4
RATE G/S
B33
26V AC REF A38 B39
2
PROCESSORhB
C
INTEGRATOR
L834 CAPT "BELOW G/S" LT (P1)B
MODE 5 WARNING
M196 ADC NO. 1 (E1-1)DETECTOR "GLIDE SLOPE"
D101 B16 F
2
F/T IN B24
hR
AUDIOGENERATOR
RR
3
AUX DC SIGNALDIFFER-
B47+B20MODE 1
ALTITUDE
4
LINEARIZERENTIATOR o
B46 -B21 CONTROL
RADIO
1
h R "WHOOP-WHOOP
ALTIMETER VALID B12 MODE 2GLIDE SLOPEPULL UP"L812 CAPT "PULL UP" LT (P1)
CONTROL
M50 LRRA NO. 1 UNIT AUDIOAUDIO
RADIO <2450'
(E2-4) REPETITIONGENERATOR
MODE 3
ALTITUDE
1TRIP
<1000'RATEPUSH TO
CONTROL G/S
D235 MODE
<700'CONTROL INHIBIT
INHIBIT
INDICATOR "SINK RATE"
A114MODE 4
1
B34
<200'
3
AUDIO
A A
CONTROL<50' GENERATOR
4
APD ENGAGE
E
MODE 5
A122
2
LRRA SIGNAL CONTROL MODE
DETECTOR
L835 F/O "BELOW G/S" LT (P3)ACCESS UNIT (E1-2)
M160 FLT INSTR"TERRAIN"
2
AUDIO
2D105
B19 GENERATOR
TESTEXTERNAL
RR
3
A
_
MODESYSTEMFAIL
TEST "DON'T SINK"
4
3
STATUSAUDIO
1
N1 LRRA NO. 1 IND (P1)ANDGENERATOR L815 F/O "PULL UP" LT (P3)
SELF
GS VALIDB26TEST
ILS (28V DC)B1
"MINIMUM"
GS DEV -
+LOGIC AUDIO
GEAR DOWN
3
GLIDE SLOPE GENERATOR
B31DEVIATION
SELECTED VHF NAV RCVR
4
B32 PROCESSOR C
B
MODEPUSH TO TEST A
A D658
"TOO LOWFAIL
4
TERRAIN"2
GEAR DOWNB12
A35 BAROTEST . BARO VALID AUDIO
1
D
VALID A GENERATORL836 GPWS "INOP"
G
GEAR UP D1205 TEST
GEAR DOWN FLAP
B22 4
3
B23"TOO LOW GEAR"
LANDING GEAR LEVELDETECTOR G/S INHIBIT
INHIBITSWITCH (P2)
E 4A
2GENERATORAUDIO
AUDIO
1
NORMAL
D1203
H
OUTPUT
D4374
FLAP INHIBIT SWITCH27
A333
FLAP UPFLAP UP TRANS-B14 4
"TOO LOW FLAP"
B24 GEAR
DETECTOR
3
C
FORMERS
4B
2
AUDIOINHIBIT
FLAP DOWN GENERATOR GPW SPEAKERNORMAL
1
(P5)
LANDING FLAP SWITCHGEAR INHIBIT SWITCH
M652 GROUND PROXIMITY WARNING COMPUTER (E2-4)
(MAIN WHEEL WELL AREA) FLAP POSITION GPWS CONTROL MODULE (P3)
Ground Proximity Warning System Schematic
Figure 3 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SEPARATE ú
34-42-00
FLAP AND GEAR INHIBIT ú SWITCHES ú 02 Page 7 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A10332
A 737-300/400/500MAINTENANCE MANUAL
1473 FPM
*65 FT NOMINAL
SINK RATE (FPM)
ON CLIMBING
Mode 1 - Excessive Descent Rate
Figure 4
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SUNDSTRAND MK II GPWC ú
34-42-00
ú ú 02 Page 8 ú Jun 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
2500
2000
1500 HEIGHTABOVETERRAIN(FT) 1000
500
00 1000 2000 3000 4000 5000
600
CLOSURE RATE (FPM)
MODE 2A - FLAPS NOT IN LANDING CONFIGURATION
HEIGHTABOVE400 TERRAIN800
(FT) 200 HEIGHTABOVE500
TERRAIN
0
(FT) 0 400 800 1200
BAROMETRIC RATE (FPM)
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