C40178
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 2
 ú 01 Page 510 (SIMMONDS SYSTEM TESTER) ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (g)  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 1) If the capacitance is out of the applicable capacitance
 range, do the system test.
 S 825-019-002
 (6)  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 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 shown on the test unit become stable. 4) Continue this procedure until you get the correct

 capacitance on the test unit display.
 S 825-020-002
 (7)  Adjust the test unit to give the capacitances equivalent to a full tank (Fig. 503).
 (a)  
Set the FUNCTION SEL switch on the test unit to INT CAP (PSD40-1) or set the FUNCT switch to MEASURE INT (PSD60-1).

 (b)  
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to COMP.

 (c)  
Adjust the SIMULATOR COMP decade capacitor (D2) and the vernier knob (V2) until the 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.
 (d)  Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to TU.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 2
 ú 01 Page 511 (SIMMONDS SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (e)  Adjust the SIMULATOR TU decade capacitor (D1) and the vernier knob (V1) until the test unit display shows the 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
 (f)  Set the FUNCTION SEL switch to SIM (PSD40-1) or set the FUNCT switch to SIM TU & COMP (PSD60-1).
 S 975-021-002
 (8)  Do a check of the values on the fuel quantity indicator with a full tank.
 (a)  
Connect the test harness to the rear of the fuel quantity indicator.

 (b)  
Close the QTY and EP GND FUELING circuit breakers, and let the system become warm for five minutes.

 (c)  
Make sure the fuel quantity indicator shows the applicable full value with the applicable tolerance: ~........................................... | TANK | FULL VALUE | ............................................. | No. 1 and 2 *[1] | 11000 |110 lb | ............................................. | Center *[1] | 16800 |170 lb | ............................................. | No. 1 and 2 *[2] | 5000 |50 kg | ............................................. | Center *[2] | 7600 |80 kg | 2..................…........................1 *[1] Fuel quantity indication in pounds *[2] Fuel quantity indication in kilograms
　
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