(b)
Disconnect the electrical connector from the rear of the fuel quantity indicator.
(c)
Connect the test harness to the applicable wire bundle on the airplane (Fig. 502).
E. Trim Procedure
S 975-018-001
(1) Measure the empty tank capacitances.
(a)
Set the DISPLAY SELECT switch on the system tester 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.
(h)
The capacitance must be equal to 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 out of the correct capacitance range, do the system test.
S 825-019-001
(2) Adjust the capacitance trimmer.
(a)
Get access to the capacitance trimmers on the pilot's instrument panel, P1, above the hand microphone receptacle.
(b)
Turn the applicable capacitance trimmer until the system test unit shows the applicable capacitance value from this table: 1) Turn the trimmer with a screwdriver.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
INDICATORS ú CONFIG 1 ú 01A Page 504 (GULL 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 1 ú 01A Page 505
(GULL 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
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 1 ú 01A Page 506 (GULL SYSTEM TESTER) ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
GROUNDED TO AIRPLANE STRUCTURE
CONNECTED TO 115 VOLTS POWER SOURCE
TO COMPENSATOR AND TANK UNITS
Test Equipment Set-Up for Capacitance Measurement
Figure 502
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ANALOG FUEL QUANTITY ú
28-41-00 INDICATORS ú CONFIG 1
ú 01A Page 507 (GULL SYSTEM TESTER) ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
2) Remove the screwdriver.
3) Let the value on the test unit become stable.
4) Continue this procedure until the test unit shows the
correct capacitance. 5) These are the applicable capacitance values:
TANK CAPACITANCE (pf) No. 1 and 2 506.6 Center 180.2
S 825-020-001
(3) Adjust the test unit to give the capacitances equivalent to a full fuel tank (Fig. 503).
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