(i)
If you have a PSD40-1 test unit, set the FUNCTION SEL switch to EXT CAP.
(j)
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to TU.
(2)
Do this task: Fuel Summation Unit Installation (AMM 28-41-81/401).
S 415-056-002
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 2
ú 01 Page 523 (SIMMONDS SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 825-058-002
(3) Set the capacitance trimmer.
NOTE:____ This step sets the airplane wiring to a standard capacitance value of 16 pf. This will make it easier to find problems with the capacitances of the equipment in the fuel tank.
(a) (b) Get access to the bussing plug installed on the spar for the applicable tank (Fig. 501).Disconnect the electrical connector from the bussing plug.
NOTE:____ Do not disconnect the bussing plug from the receptacle installed on the spar.
(c) (d) (e) (f) Get access to the capacitance trimmers on the pilot's instrument panel, P1, above the hand microphone receptacle.Turn the applicable capacitance trimmer with a screwdriver until the test unit shows 16.0 pf.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.Connect the electrical connector to the bussing plug installed on the spar.
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(4) Measure the empty tank capacitances. (a) Measure the capacitance of the tank units. (b) 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
ú ú (c) If the capacitance is out of the applicable range of values, dothe test for the tank units and the compensator(AMM 28-41-21/501). 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.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 2
ú 01.1 Page 524 (SIMMONDS SYSTEM TESTER) ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(d)
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to COMP.
(e)
Measure the capacitance of the compensator. 1) The capacitance must be 40.2 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.
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(5) 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
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(6) Adjust the test unit to give the capacitances equivalent to a full fuel tank.
(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).
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本文链接地址：737-300 400 500 AMM 飞机维护手册 燃油 FUEL 3(93)
