737-300/400/500
MAINTENANCE MANUAL
8000 PROBESIMA/C TESTCOMP UNSH COMP PROBE SIM A/C A/C+ PROBE SIM A/C+ HIGH ADJ LOW ADJ 200 1000 4000 CAP (PF) RES (MEG) AB AC A-GND B-GND C-GND EXT MES LOW HIGH TEST 0.11 1.10 10.100 100.1K 1K 10K HIGH ADJ DISPLAY TEST LOW ADJ CAPACITANCE RESISTANCE 10K 100K
COMP SIM FUNCTION RANGE (PF) DISPLAY SELECT FUNCTION RANGE (MEG) TEST
15-390 600 8000 200 400 1000 2000 3000 4000 5000 6000 7000 15-390 0 COMPPROBE SIMULATORS (PF)
AUX SIMULATORS (PF) CAUTION CONNECT TO 105-125 VAC. 47-640 HZ TO
15-390 15-390 PERMANENTLY GROUND TEST SET PRIOR TO CONNECTION AIRCRAFT ON 3/4 AMP SOLENOID
AUX 2AUX 1 POWER OFF SPARE GND J1
SYSTEM TESTER
GROUNDED TO AIRPLANE STRUCTURE
CONNECTED TO 115 VOLTS
FUEL QUANTITY DO NOT
INDICATOR CONNECT
GULL SYSTEM TESTER
Test Equipment Set-Up for Capacitance Measurement
Figure 502
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28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 02 Page 507 (GULL SYSTEM TESTER) ú Jul 15/90
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737-300/400/500MAINTENANCE MANUAL
(h)
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...............…........................….................1
(i)
If the capacitance is out of the applicable capacitance range, do the system test.
S 825-019-001
(6) Adjust the capacitance trimmer.
(a)
Get access to the capacitance trimmers on the pilot's
instrument panel, P1, above the hand microphone jack.
(b)
Turn the applicable capacitance trimmer until the system test unit shows the applicable capacitance value: ~....................................... | TANK | CAPACITANCE (pf) | ......................................... | No. 1 and 2 | 506.6 | ......................................... | Center | 180.2 | 2...............….......................1 1) Turn the trimmer with a screwdriver. 2) Remove the screwdriver. 3) Let the value on the test unit display become stable. 4) Do this procedure again until you have the correct
capacitance.
S 825-020-001
(7) Adjust the test unit to give the capacitances equivalent to a full fuel tank (Fig. 503).
(a) Set the CAPACITANCE FUNCTION switch on the test unit to SIM SET - COMP. 1) Turn the SIMULATORS - COMP knob until the test unit display
shows 41.4 pf as the added capacitance value.
NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
(b) Set the CAPACITANCE FUNCTION switch to SIM SET - PROBE.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 01 Page 508 (GULL SYSTEM TESTER) ú Mar 12/02
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737-300/400/500MAINTENANCE MANUAL
(c) Turn the SIMULATORS - PROBE knobs until the test unit display 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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