NOTE: Do not disconnect the bussing plug from the
____
receptacle installed 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 test unit shows 16.0 picofarads (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.
(f)
Connect the electrical connector to the bussing plug installed on the spar.
S 975-041-001
(6) Measure the empty tank capacitances.
(a) 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 516 (GULL SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(b)
The tank units must have these capacitances with the applicable tolerance: ~.......................................................... | TANK | CAPACITANCE (pf) | TOLERANCE (pf) | ............................................................ | No. 1 and 2 | 506.6 | |7.8 | ............................................................ | Center | 180.2 | |2.7 | 2...............…........................….................1
1) 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.
(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 picofarads (pf) with a tolerance of |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.
S 825-056-001
(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 | 2...............….......................1
S 825-042-001
(8) Adjust the test unit to give the capacitances equivalent to a full tank.
(a) Set the CAPACITANCE FUNCTION switch on the system test unit to SIM SET - COMP.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 01 Page 517 (GULL SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(b) Turn the SIMULATORS - COMP knob until the system test unit display shows 41.4 pf as the added capacitance.
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 value:
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 | 2..................…........................1 *[1] Fuel quantity indication in pounds *[2] Fuel quantity indication in kilograms
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