S 485-018-002
 (4)  Connect the test equipment.
 (a)  
Remove the fuel quantity indicator from the pilots' panel (Fig. 501).

 (b)  
Disconnect the electrical connector from the rear of the fuel quantity indicator.

 (c)  
Connect the test harness to the airplane wire bundle.

 (d)  
Connect the test harness to the system test unit (Fig. 502).

 E. Trim Procedure
 S 975-022-002
 (1)  Measure the empty tank capacitances.
 (a)  
Set the FUNCTION SEL switch on the system test unit to EXT CAP (PSD40-1) or set the FUNCT switch to MEASURE EXT (PSD60-1).

 (b)  
Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to COMP.

 (c)  
Set the power switch to ON.

 (d)  
Measure the capacitance of the compensator.

 (e)  
The capacitance must be 40.2 picofarads (pf) with a tolerance of |1.2 pf.

 (f)  
Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to TU.

 (g)  
Measure the capacitance of the tank units.

 (h)  
The capacitance must have these values with the applicable tolerance. TANK CAPACITANCE (pf) TOLERANCE (pf)

 No. 1 and 2 506.6 |7.8
 Center 180.2 |2.7

 (i)  
If the capacitance is not in the applicable capacitance range, do the system test.

 S 825-023-002
 (2)  Adjust the capacitance trimmer.
 (a)  Get access to the capacitance trimmers on the pilot's instrument panel, P1, above the hand microphone receptacle.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 2 ú 02A Page 505 (SIMMONDS SYSTEM TESTER) ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Fuel Quantity Indicating System Component Location Figure 501 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY  ú 28-41-00
 INDICATORS  ú CONFIG 2 ú 02A Page 506
 (SIMMONDS SYSTEM TESTER)  ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE

BUSSING PLUG SEE

TANK AND COMPENSATOR UNIT BUSSING PLUG
FUEL QUANTITY INDICATING SYSTEM ELECTRICAL CONNECTOR

C

Fuel Quantity Indicating System Component Location
Figure 501 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS ú CONFIG 2 ú 02A Page 507 (SIMMONDS SYSTEM TESTER) ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FUNCTION MEASURE SWITCH

SELECT SWITCH
TESTER POWER SWITCH
TANK  CABLES ADAPTER 
WING  PSD40-502-3 
CENTER  PSD40-502 

DO NOT
TO
CONNECT TO
COMPENSATOR
FUEL
AND TANK
QUANTITY
UNITS
INDICATOR
SIMMONDS PSD40-1 SYSTEM TESTER

Test Equipment Set-Up for Capacitance Measurement
Figure 502 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ANALOG FUEL QUANTITY ú
 28-41-00 INDICATORS ú CONFIG 2
 ú 01A 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
　
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