(11)
 Close the access door, 6540, for the refuel control panel (P15).

 S 415-012-003
 TASK 28-41-02-825-013-003
 3. System Trim - Fuel Quantity Indicating System
_____________________________________________
 A. Special Tools and Equipment
 (1)  System test unit - Model 8000, Barfield Instrument Corp., Miami, Florida 33142
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 01 Page 503 (BARFIELD SYSTEM TESTER) ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  Test harnesses
 NOTE:____You must control the quality of the test cables. Make sure the stray capacitance for the test cables is less than
 0.2 pf.
 (a)  F72731-121 - tanks No. 1 and 2
 (b)
F72731-119 - center tankReferences

 (1)  
AMM 24-22-00/201, Manual Control

 (2)
AMM 28-23-00/201, DefuelingAccess

 (1)  
Location Zones 101 Control Cabin, Left 402 Right Wing Outboard Leading Edge

 (2)  
Access Panels 6540 Refueling Station Access Door

Prepare for the Trim
 S 865-014-003
 (1)  
Connect the external electrical power (AMM 24-22-00/201).

 S 655-015-003

 (2)  
Remove all fuel from the fuel tank and 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 865-016-003
 (3)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) QTY
 2) EP GND FUELING

 S 485-017-003
 (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 indicator.

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

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 03 Page 504 (BARFIELD SYSTEM TESTER) ú Mar 12/02
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A 737-300/400/500MAINTENANCE MANUAL

QUANTITY INDICATOR TEST SWITCH

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

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 03 Page 505 (BARFIELD SYSTEM TESTER) ú Nov 15/91
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A 737-300/400/500MAINTENANCE 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 3
 ú 06 Page 506 (BARFIELD SYSTEM TESTER) ú Jul 15/95
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A 737-300/400/500MAINTENANCE MANUAL
DO NOT 
FUEL QUANTITY  CONNECT 
INDICATOR  TO COMPENSATOR 
　
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