737-300 400 500 AMM 飞机维护手册 AIRBORNE AUXILIARY POWER 2(118)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
6) Set the ISOLATION VALVE switch on the P5 forward overhead
 panel to the CLOSED position.
 7) Set the APU BLEED switch on the P5 forward overhead panel
 to the OFF position.
 8) Do the APU usual shutdown (AMM 49-11-00/201).
 9) If the APU EGT shown on the EGT indicator did not agree
 with the Table 1 value, adjust the ETC (AMM 49-61-71/501).
 (g)  If the maximum permitted ETC temperature is set at the operators specified value, do these steps: 1) Disconnect the T2 bias connector from the ETC. 2) Monitor the maximum APU EGT permitted by the ETC. 3) Write the maximum APU EGT permitted by the ETC. 4) Remove the 100 amp electrical load from the APU electrical
 generator. 5) Set the R PACK and L PACK switches to OFF. 6) Set the APU BLEED switch to OFF. 7) Do the APU usual shutdown (AMM 49-11-00/201). 8) If the maximum APU EGT permitted by the ETC does not
 agree with the operators value, adjust the ETC (AMM 49-61-71/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú

 49-61-71
 ú ú 02 Page 604 ú Nov 15/97
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EXHAUST GAS TEMPERATURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________________
 1.  General (Fig. 1)
_______
 A.  The EGT indicating system measures the temperature of the APU engine exhaust. This temperature is shown on the EGT indicator on the P5 forward overhead panel. The EGT indicating system has a thermocouple probe, an EGT resistor, a harness balancing resistor, and an EGT indicator. The airplane wires are copper and constantan. The wires in the APU shroud are chromel and alumel because of the high temperatures.
 B.  The thermocouple probe measures the EGT of the APU engine. The heat of the exhaust gases makes the thermocouple probe send a dc signal to the EGT indicator, on the P5 forward overhead panel, to show the correct temperature. The EGT resistor is part of the circuit. The EGT resistor and the harness balancing resistor adjust the EGT indicating system.
 2.  Thermocouple Probe
__________________
 A.  The thermocouple probe measures the temperature of the exhaust gases from the APU engine. The thermocouple probe is installed in the turbine exhaust port. The thermocouple probe has two stud terminals, a head, and a measurement junction. The thermocouple leads and studs are made of chromel and alumel materials. The alumel stud terminal (-) is larger than the chromel stud terminal (+).
 3.  EGT Resistor
____________
 A.  The EGT resistor permits the adjustment of the circuit for the EGT indicating system. The EGT resistor has a spool of No. 24 constantan wire, coarse adjustment terminals, and vernier adjustment terminals. The primary adjustment for the resistance removes wire from the resistance spool. Because of this, the EGT resistor has an extra spool of wire.
 4.  Harness Balancing Resistor
__________________________
 A.  ON AIRPLANES WITH THE HARNESS BALANCING RESISTOR; The harness balancing resistor has a specified resistance value. The harness balancing resistor is installed for each APU engine. Do not replace the harness balancing resistor with any other resistance value.
 B.  ON AIRPLANES WITHOUT THE HARNESS BALANCING RESISTOR; A set length of chromel-alumel wire causes the thermocouple harness resistance.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT THE ETC ú

 49-71-00
 ú CONFIG 1 ú 01 Page 1 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FORWARD OVERHEAD PANEL, P5
SEE B
SEE A
FLIGHT COMPARTMENT 
AMPERES AC 200 50 150 100  PWR OFF GRD GRD POWER AVAILABLE  AMPERES AC 200 50 150 100 
ON 
TRANSFER BUS OFF BUS OFF  O F F  BUS TRANS  A U T O  TRANSFER BUS OFF BUS OFF 
　
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