D. Prepare for the Trim
 S 865-016-003
 (1)  
Connect the external electrical power (AMM 24-22-00/201).

 S 655-017-003

 (2)  
Remove all the fuel from the fuel tank, and remove the fuel in the sumps (AMM 28-23-00/201).

 NOTE: If you do the trim for only one tank system, you can move
____
 the fuel into the other tanks.

 S 865-018-003
 (3)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) EP GND FUELING
 2) QTY

 S 485-019-003
 (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 975-020-003
 (1)  Measure the empty tank capacitances.
 (a)  
Set the battery switch on the test unit to ON.

 (b)  
Push the PRESS TO MEASURE switch and hold it.

 (c)  
Turn the TANK CAP PF thumbwheels until the meter shows the minimum value.

 NOTE: If you turn the thumbwheels to a position farther
____ than the correct position, the value on the meter increases.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 3 ú 01A Page 504 (BARFIELD SYSTEM TESTER) ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

QTY TEST

FUEL QUANTITY
INDICATOR TEST SWITCH

B

Fuel Quantity Indicating System Component Location
Figure 501 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  3
 ú  01A  Page 505
 (BARFIELD 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 3 ú 02A Page 506 (BARFIELD SYSTEM TESTER) ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DO NOT 
FUEL QUANTITY  CONNECT 
INDICATOR  TO COMPENSATOR 
AND TANK UNITS 

METER 
ADJUST  ON  TESTER 
INDICATOR  BATTERY 
OFF 
SWITCH 
INS TEST POINTS  BATT 
TEST  GND/HI-Z GND/LO-Z  SH/HI-Z SH/LO-Z  TEST 
FUNCTION  GND/SH  LOZ/HI-Z  COAXIAL 
SWITCH 
.1  CAP BRIDGE TEST FUNCTION INDICATOR  UNSHIELDED 
INSULATION  1  CAP SIM 
HI-Z  RANGE .01  2  TANK CAP pf  COAX HI-Z 
PRESS TO  LO-Z  1  7  4  5  LO-Z 
MEASURE  TANK 
0-10 
BUTTON  100 10 
GND  1  7  COMP 
D.F.  COMP 
PRESS TO 
MEASURE  COMP SIM pf 
COMP 
CAL 

SHORTING CAPS TANK CAP INSTALLED
　
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