(b)
Disconnect the electrical connector from the bussing plug.
NOTE: Do not disconnect the bussing plug from the
____
receptacle mounted on the spar.
(c)
Get access to the capacitance trimmers on the pilot's instrument panel, P1, above the hand microphone receptacle.
(d)
Turn the applicable capacitance trimmer with a screwdriver until the system test unit shows 16.0 pf.
(e)
If it is not possible to set the trimmer so that the test unit shows 16 pf, examine the airplane wiring between the bussing plug and the indicator.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
INDICATORS ú CONFIG 1 ú 01A Page 515 (GULL SYSTEM TESTER) ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(f) Connect the electrical connector to the bussing plug installed on the spar.
S 975-039-001
(6) Measure the empty tank capacitances.
(a) Measure the capacitance of the tank units.
1) 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
2) If the capacitance not in the applicable range of values, do the test for the tank units and the compensator (AMM 28-41-21/501).
3) If the capacitance is out of the correct range of values, do this Task: Tank and Compensator Units Test (AMM 28-41-21/501), to find a bad tank unit or wire harness.
S 825-060-001
(7) Adjust the capacitance trimmer.
(a)
Get access to the capacitance trimmers on the right side of the control stand 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. 2) Let the value on the test unit become stable. 3) Continue this procedure until the test unit shows the
correct capacitance. 4) These are the applicable capacitance values:
TANK CAPACITANCE (pf) No. 1 and 2 506.6 Center 180.2
(c)
Set the CAPACITANCE FUNCTION switch to A/C TEST - COMP.
(d)
Read the capacitance of the fuel compensator. 1) The capacitance must be 40.2 |1.2 pf. 2) If the capacitance is out of the correct range, do this
task: Tank Unit and Compensator Test (AMM 28-41-21/501), to find the problem with the compensator or the wiring.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
INDICATORS ú CONFIG 1 ú 01A Page 516 (GULL SYSTEM TESTER) ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 825-040-001
(8) Adjust the test unit to give the capacitances equivalent to a full fuel tank (Fig. 503).
(a)
Set the CAPACITANCE FUNCTION switch on the system test unit to SIM SET - COMP.
(b)
Turn the SIMULATORS - COMP knob until the display on the system test unit shows 41.4 pf.
NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
(c)
Set the CAPACITANCE FUNCTION switch to SIM SET - PROBE.
(d)
Turn the SIMULATORS - PROBE knobs until the display on the test unit shows the applicable added capacitance for each tank:
NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
TANK ADDED CAPACITANCE (pf) No. 1 and 2 *[1] 568.8 Center *[1] 191.0
No. 1 and 2 *[2] 569.9
Center *[2] 190.5
*[1] Fuel quantity indication in pounds
*[2] Fuel quantity indication in kilograms
(e) Set the CAPACITANCE FUNCTION switch to IND TEST - A/C + PROBE SIM + COMP SIM.
S 975-041-001
(9) Do a check of the values on the fuel quantity indicator with a full tank.
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