737-300/400/500
MAINTENANCE MANUAL
TANK NO. 2 BUSSING PLUG 
SEE C 
TANK NO. 1 BUSSING PLUG 
SEE C 
TANK AND COMPENSATOR UNIT BUSSING PLUG 
FUEL QUANTITY INDICATING SYSTEM ELECTRICAL CONNECTOR 
BUSSING PLUG C 
Fuel Quantity Indicating System Component Location 
Figure 501 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 2
 ú 05 Page 507 (SIMMONDS SYSTEM TESTER) ú Jul 15/95 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 737-300/400/500MAINTENANCE MANUAL 
FUNCTION MEASURE SWITCH 
DO NOT
TO 
CONNECT TO 
COMPENSATOR 
FUEL 
AND TANK 
QUANTITY 
UNITS 
INDICATOR 
SIMMONDS PSD60-1 SYSTEM TESTER 
SIMMONDS PSD40-1 SYSTEM TESTER 
TANK  ADAPTER CABLES  
WING  PSD40-502-3  
CENTER  PSD40-502 
Test Equipment Set-Up for Capacitance Measurement 
Figure 502 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 2
 ú 01 Page 508 (SIMMONDS SYSTEM TESTER) ú Jul 15/93 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 
737-300/400/500MAINTENANCE MANUAL 
POWER SWITCH 
SIMMONDS 
PRECISION
ON PF 
PRESS FOR 
TWO TERM. 
MEG READINGS
506.6 
CHASSIS 
M
OFF
PSD60-1 
AIRCRAFT ONLY 
SIM TU ONLY SIMULATOR
F 
SIM TU & COMP U 
INDICATOR
TANK N UNITS 
TU
MEASURE INT C COMP 
T MEASURE EXT 
0 2 0 42
LOZ 
T 
TU 
PF COMP 
T
LOZ-HIZ 
U 
10-200 PF 
10-2000 PF LOZ-COMP S 
COMP-HIZ 
HIZ 
LOZ-SHLD E 
C
L
SHLD H COMP-SHLD
O 
E 
M
HIZ-SHLD
M 
C 
P
SHLD-GND 
T 
COMP
LOZ-GND 
COMP-GND 
C
HIZ-GND SYSTEM TESTER 
ADAPTER
TANK 
CABLES 
CONNECT TO 
AIRFRAME 
WING
PSD40-502-3GROUND 
CENTER 
PSD40-502 
DO NOT TO 
CONNECT TO PSD40-503 COMPENSATOR 
FUEL AND TANK 
QUANTITY UNITS 
INDICATOR 
AIRCRAFT
ADAPTER 
T-CABLE WIRINGCABLE 
SIMMONDS PSD60-1 SYSTEM TESTER 
Test Equipment Set-Up for Capacitance Measurement 
Figure 502 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 2
 ú 01 Page 509 (SIMMONDS SYSTEM TESTER) ú Jul 15/93 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 737-300/400/500MAINTENANCE MANUAL 
FUNCTION MEASURE SWITCH 
FUNCTION HIZ-SHLD SHLD-GND 
SIMULATOR COMP-SHLD LOZ-GND 
SIMMONDS 
LOZ-SHLD 
COMP-GND COMP 2 LOZ-COMP HIZ-GND 
PRECISION 
X100 PF
PF 
V1 M^ D1
COMP
D4 
COMP-HIZ HIGH TU LOW
FUNCTION 
LOZ-HIZ 0-200 PF 
S3 TU 
MEASURE
SELECT 
SWITCH 
INT CAP 
SIM EXT CAP CAP SELF TEST 
MEG MEG 
X10 PF V2 FUNCTION SEL S2 D2 
0-25 PF 
J1 LOZ J4 PSD40-1 COMP 
J2 HIZ
TESTER 
POWER 
J3 COMP
X10 PF V3 INDICATOR TAN 
SWITCH 
D3 
0-25 PF ON 
J7 COMP
J9 
O F
S1 
CHA SIS 
LOZ 2 HIZ COMP 2 
GROUNDED TO UNSHIELDED AIRPLANE 
COMP 
STRUCTURE COAXIAL 
F72731 
FUEL QUANTITY 
INDICATOR 
TO COMPENSATOR AND TANK UNITS 
DO NOT CONNECT 
SIMMONDS PSD40-1 SYSTEM TESTER WITH THE F72731 CABLE 
Test Equipment Set-Up for Capacitance Measurement 
 
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