Smiths Aerospace
Electronic Systems – Malvern
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
BOEING B737-100/200/300/400/500
28-41-04
(j) Set the FUNCTION MEASURE switch (PSD40-1) or SELECT switch (PSD60-1, -2) or
MEGGER SELECT switch (PSD60 -2R) to each of the SHLD or GND positions.
1) Make sure that each resistance shown on the system tester is more than the applicable
minimum resistance:
SWITCH SETTING
MINIMUM RESISTANCE
LOZ-HIZ
250 Megohm (total resistance for tank units)
COMP-HIZ
2000 Megohm (total resistance for compensator)
LOZ-COMP
2000
Megohm
LOZ-SHLD
1
Megohm
COMP-SHLD
1
Megohm
HIZ-SHLD
1
Megohm
SHLD-GND
10
Megohm
LOZ-GND
10
Megohm
COMP-GND
10
Megohm
HIZ-GND
10
Megohm
(2) Do this task: Fuel Summation Unit Installation or V-Ref/Totalizer installation as applicable (AMM
28-41-81/401).
(3) Do this task: Refueling indicator installation (AMM 28-41-04/401).
(4) Verify that capacitance trimmers are set per paragraph 4.A.5.
(5) Measure the empty tank capacitances (Fig. 503).
(a) If you have a PSD40-1 test unit, set the FUNCTION SEL switch to EXT CAP.
(b) If you have a PSD60-2R test unit, set the CAPACITANCE MEASUREMENT MODE switch to
MODE A.
(c) Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1, -2) or
the MEGGER SELECT switch (PSD60-2R) to TU.
CONFIG
4.2
Page 506
April 19/02
Airplanes with Smiths 2307 Model Fuel Quantity Indicators
with TSU
(SIMMONDS SYSTEM TESTER)
EFFECTIVITY
