R EFF : 001-049, 101-105, 107-107, 151-199, 49-72-00Page 1 201-210, Config-2 Aug 01/05
CES
APU Temperature Indicating - Component Location
Figure 001
CES
APU Temperature Indicating - Block Diagram
Figure 002
CES Additionally the computed signal is transmitted via an ARINC 429 bus to the EIS. The APU SYSTEM page on the lower ECAM display unit shows the EGT in deg. C in an analog and a digital display.
CES
TEMPERATURE INDICATING - DESCRIPTION AND OPERATION
__________________________________________________
1.
General
_______ The temperature indicating system monitors the APU Exhaust Gas Temperature (EGT). Two thermocouples, transmit a signal to the ECB 59KD. The ECB 59KD gives a EGT signal to the Electronic Instrument System (EIS). The EIS shows on the APU page at the lower ECAM display unit the APU EGT in DEG. C.
2.
Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------EGT SENSOR TC1 315 316AR 49-72-15 EGT SENSOR TC2 316 315AL 49-72-15
3.
System Description
__________________ (Ref. Fig. 001, 002) The temperature indicating system shows the EGT on the EIS lower ECAM display unit. Two EGT thermocouples are installed in the exhaust cone at the turbine discharge. The thermocouples are connected together. Each thermocouple is connected to the ECB 59KD. The ECB 59KD reads the average temperature of the two thermocouple and transmits the EGT signal to the EIS. If a failure of one thermocouple occurs, the ECB 59KD takes the value of the remaining thermocouple and transmits this EGT signal to the EIS. The EIS shows the EGT in DEG. C on the EIS lower ECAM display unit.
4.
Interface
_________
The temperature indicating system has interface with the Control and
Monitoring System (Ref. 49-61-00).
5.
Component Description
_____________________
A. EGT Thermocouples The EGT thermocouple is a chrome-alumel device which has two probes of different lengths. The EGT thermocouples produce a voltage in proportion to the EGT. This voltage is supplied through a shielded cable to the ECB 59KD.
APU Temperature Indicating - Component Location
Figure 001
CES
Thermocouple - Description
Figure 002
CES
6. Operation/Control and Indication________________________________ (Ref. Fig. 002)
A. Operation The thermocouple measure the EGT and supply a voltage to the ECB 59KD. The ECB 59KD monitors the temperature indications in all APU operating conditions (Ref. 49-61-00).
The ECB 59KD starts the automatic shutdown sequence if the two thermocouple are defective during the APU start.
B. Control and Indication The EIS shows on the APU page at the SD the APU EGT in DEG. C (Ref. 49-00-00).
THERMOCOUPLE ((GTCP 36-300)) - MAINTENANCE PRACTICES
____________________________________________________ R **ON A/C 001-003, 051-099, 401-499,
TASK 49-72-15-000-003
Removal of the Thermocouple Probes (8057KM1) and (8057KM2) (GTCP 36-300)
WARNING : ISOLATE ALL THE AIRCRAFT ELECTRICAL CIRCUITS.
_______
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______
WHEN YOU DO THE MAINTENANCE TASK(S).
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
No specific blanking plugs
No specific circuit breaker(s) safety clip(s)
No specific warning notice
No specific access platform 3.5 m (11 ft. 6 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action
52-41-00-010-001 Open the APU Doors for Access
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