S 415-012-001
(11)
Close the access door, 6540, for the refuel control panel (P15).
TASK 28-41-02-825-013-001
3. System Trim - Fuel Quantity Indicating System
_____________________________________________
A. Equipment
(1)
System test unit - Model GTF-2, P/N 361-012-001, Gull Airborne Instruments Inc., 55 Engineers Road, Smithtown, N.Y. 11787
(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)
F72731-115 - center tank
(b)
F72731-117 - tanks No. 1 and No. 2
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B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
References
(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
Prepare for the Trim
S 865-014-001
(1)
Connect the external electrical power (AMM 24-22-00/201).
S 655-015-001
(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 865-016-001
(3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) QTY
2) EP GND FUELING
S 485-017-001
(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).
S 975-018-001
(5) Measure the empty tank capacitances.
(a)
Set the DISPLAY SELECT switch on the system test unit to CAP.
(b)
Set the CAPACITANCE FUNCTION switch to A/C TEST - 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 CAPACITANCE FUNCTION switch to A/C TEST - UNSH.
(g)
Measure the capacitance of the tank units.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 01 Page 504 (GULL SYSTEM TESTER) ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FUEL QUANTITY INDICATOR TEST SWITCH
Fuel Quantity Indicating System Component Location
Figure 501 (Sheet 1)
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ú 03 Page 505 (GULL SYSTEM TESTER) ú Jul 15/90
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A 737-300/400/500MAINTENANCE MANUAL
BUSSING PLUG SEE
FUEL QUANTITY INDICATING SYSTEM ELECTRICAL CONNECTOR
C
Fuel Quantity Indicating System Component Location
Figure 501 (Sheet 2)
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