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(3)
Put the power switch on the test unit to ON.
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(4)
Set the FUNCTION SEL switch to MEG (not SELF TEST MEG) (PSD40-1) or set the FUNCT switch to MEASURE EXT (PSD60-1).
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(5)
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to LoZ - HiZ.
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(6)
Read the total resistance for the tank units.
(a) Make sure that the measured resistance is more than 250 megohms.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ISOLATED FUEL QUANTITY ú 28-41-91
TRANSMITTER (IFQT) ú CONFIG 2 ú 01 Page 604 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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(7)
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to COMP-HIZ.
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(8)
Read the total resistance for the compensator.
(a) Make sure that the measured resistance is more than
250 megohms.
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(9) Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to each of the SHLD or GND positions shown in the table below.
(a) Make sure that the measured resistance is more than the applicable minimum resistance:
~............................................................ | |MINIMUM RESISTANCE| | SYSTEM TEST SET SWITCH POSITION | (Megohms) | .............................................................. |HIZ - GND (HiZ to Airframe ground) | 10 | .............................................................. |LOZ - GND (LoZ to Airframe ground) | 10 | .............................................................. |COMP - GND (Comp LoZ to Airframe ground) | 10 | .............................................................. |LOZ - SHLD (UT LoZ to Airframe ground) | 1 | .............................................................. |COMP - SHLD (Comp LoZ to Coax Shld) | 1 | .............................................................. |HIZ - SHLD (HiZ to Coax Shld) | 1 | .............................................................. |SHLD - GND (Coax Shld to Airframe ground)| 10 | 2.........................................…..................1
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(10) If a measured resistance value is less that the minimum value, do a check for a short circuit in one of these areas (AMM 28-41-21/501 or AMM 28-41-03/501):
(a) Tank Unit 1) The wires that connect the tank unit to the FQIS. 2) The plug that connects the tank unit to the wire bundle. 3) The receptacle that connects the tank unit to the wire
bundle.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ISOLATED FUEL QUANTITY ú 28-41-91
TRANSMITTER (IFQT) ú CONFIG 2 ú 01 Page 605 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(b) Compensator Unit 1) The wires that connect the compensator unit to the FQIS. 2) The plug that connects the compensator unit to the wire
bundle. 3) The receptacle that connects the compensator unit to the wire bundle.
F. Resistance Check of the IFQT Wire Harness
S 036-018-002
(1) Disconnect the IFQT wire harness plug from the bussing plug at the tank wall spar connector.
NOTE: Refer to the table below for harness designations and bussing
____
plugs applicable for a fuel tank.
~................................................................. | | BUNDLE | | BUSSING | | TANK | NUMBER | HARNESS P/N | PLUG | ................................................................... | LEFT MAIN | M1732 | 50728-1301-0101 | D1588 | | (No. 1) | |(alt p/n 50728-1305-0101) | | ................................................................... | CENTER TANK | M1736 | 50728-1303-0101 | D1590 | | | |(alt p/n 50728-1304-0101) | | ................................................................... | RIGHT MAIN | M1734 | 50728-1302-0101 | D1586 | | (No. 2) | |(alt p/n 50728-1306-0101) | | ................................................................... | AUXILIARY | M1750 | 50729-1304-0101 | N/A | 2...................…........…..........................….........1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 燃油 FUEL 3(156)
