AIR DATA
MASTERTIMING CLOCKC
TOTAL GENERATOR (W/A's)
Pt
CAPT VSI
PRESSURE
GPWS

XDCR
M
115V AC
Pt TP
Ps AND Pt
ELEX PWR 1

(FIG 6)
I
TIME PULSE
C
Ps TP
GENERATOR
R+B22MACH 1
DIFFERENTIAL
P18-2 CB PNL
O
AMPLIFIER-B20
+C
1 OF 6 A/D
+B16MACH 2 DC REF
O
-
CONVERTER
-B14
M
A68+SAT
NC
P
FUNCTION
A69-
U
A55+TAS
INOP SLEWA66-
PUSH
TB47+CAS
TO TEST INOP

EB45-
R A10+ALT
FAIL (FIG 6) TEST SELECT
A11-
MUX SOURCE DESTINATION IDENTIFIER (SDI)
1
TEMPRESISTANCE
B49
(FIG 6) PROBE TO VOLTAGE
B59 CONVERTER A28
BARO SET
(FIG 6)

BARO ALT REF 1A29
SYNCHRO
BARO ALT REF 2 B60DE MOD/MODULE
(FIG 6)

B61BUFFER
A39
BARO CORRECTION 1 A41
(SH 3) A40

S
B69
BARO CORRECTION 2B71
(FIG 6) B70

ALT REPORTING ENABLE ATC MODULE & WATCH DOG TIMER
(FIG 6) B13
B1
B2
B3
B4

ATC B5DIGITIZED
DRIVERS LATCHES
ALTITUDE

B6
B7
(FIG 6)

B8
WATCHB9
DOG
SDI

B11
SYSTEMTIMER B12
1
PIN #
B52
ADC 1
B53

ADC 2
Air Data System No. 1 Schematic (No. 2 Typical)
Figure 4 (Sheet 1)

OUTPUT PROCESSOR ALTITUDE SYNCHRO
V REF AC
S
SIMULATOR
SIN òANDSAMPLE
GENERATOR
SCOTT "T"HOLDTRANSFORMER
COSINE ò
GENERATOR

1 OF 6 V REF AC1 OF 6
(ALT) AC WRAP AROUND (WA)(A/S MACH) AC WRAP AROUND (WA)
V REF AC  A/S MACH TAS SYNCHROSIMULATOR
SIN òSAMPLE
GENERATOR
ANDSCOTT "T"HOLDTRANSFORMER
COSINE ò
1 OF 6
GENERATOR
V REF AC 1 OF 6 D/A DE-DC WRAP AROUND (WA)CONVERTER MUX

ALT RATE BUFFERANDHOLD1 OF 4SAMPLE1 OF 4
DC POT BUFFERANDHOLD1 OF 5SAMPLE1 OF 5
AIRSPEED (Q) POT MODULE
SPD
LATCH
SW
ARM DIGITAL BUS MODULE
ARINC
429
XMTR FAILURE WARNING MODULE
BUFFER LATCHES DRIVER
R
DCMASTER FAIL TEST VALID
DC K1 WHEN LIT

A 737-300/400/500MAINTENANCE MANUAL
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A 737-300/400/500MAINTENANCE MANUAL

26V AC POWER INPUT

COMPUTED

3
AIRSPEEDINPUT
AUTOTHROTTLE
EXCITATION 26V AC
(22-31-00)

AUTO THROTTLEOUTPUT(22-31-00)
OVERSPEED SWITCHOUTPUT (34-15-00)

4

TARGET AIRSPEED INPUT
(22-31-00)

TARGET AIRSPEEDREFFERENCE INPUT(22-31-00)

TARGET AIRSPEED VALID IN(22-31-00)
MACH WARNING TEST IN
(34-15-00)

5 ALT VALID 3 IN
VMO/MMO CURVE
SELECT INPUT
(FIG 7)

COARSE ALTITUDE INPUT
FINE ALTITUDE INPUT
0-5V AC PANEL LIGHTS ELECTRIC MACH AIRSPEED INDICATOR
Air Data System No. 1 Schematic (No. 2 Typical)Figure 4 (Sheet 2)

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ELEXPWRTAT IND 1
26V ACP18 CB PNL

TAT/SAT/TAS INDICATOR
115V AC
(SH 1)

DC
RATE 3
(SH 1)

26V AC
(FIG 7)

ALTITUDE
VALID 3
(SH 1)
VERTICAL SPEED INDICATOR

A 737-300/400/500MAINTENANCE MANUAL
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