-
the Electrohydraulic Servovalve (EHSV),
-
the Linear Variable Differential-Transducer (LVDT).
-
the Internal Return Spring
C. Load Compressor Inlet Temperature/Pressure Sensor The load compressor inlet temperature/pressure sensor is a combined unit. It is located at the APU air intake plenum. The temperature part of the sensor measures the temperature in the air intake plenum. The sensor is a variable resistor which is fed by a constant 1mA current suppied from the ECB. The ECB uses the sensor output voltage for the control of the fuel metering, the EGT limitation and the air flow calculation.
The pressure part of the sensor measures the air pressure in the air intake plenum. The pressure sensor is a varable resistor device. The ECB uses the sensor output voltage for the control of the fuel metering, the EGT limitation and the air flow calculation.
D. Load Compressor Discharge Temperature Sensor The load compressor discharge temperature sensor is located on the APU bleed valve inlet duct. The sensor is a variable resistor which is fed by a constant 1mA current suppied from the ECB. The ECB uses the sensor output voltage for the calculation of the air flow.
5. Operation/Control and Indication
________________________________ (Ref. Fig. 003) The adjustable IGVs control the load compressor airflow (output) for the necessary input to the aircraft system (Ref. 49-51-00). The APU maintains a closed IGV position of 72 degrees during its acceleration phase, until a check point is reached at 98 % N. After this point, the IGVs move fractionally to assume their fully closed position of 82 degrees. The aircraft system transmits a demand signal to the Electronic Control Box (ECB) 59KD to give the necessary IGV control.
SENSOR - APU INLET TEMPERATURE - REMOVAL/INSTALLATION
_____________________________________________________ TASK 49-23-14-000-001 Removal of the Sensor-APU Inlet Temperature (8010KM) (131-9(A)) 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 circuit breaker(s) safety clip(s)
No specific Protective cover
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 49-23-14-991-001 Fig. 401
R EFF : 001-049, 101-105, 107-107, 151-199, 49-23-14Page 401 201-210, Aug 01/05
CES 3. Job Set-up
__________ Subtask 49-23-14-860-050
A. Aircraft Maintenance Configuration
(1)
Energize the ground service network
(Ref. TASK 24-42-00-861-001).
(2)
On the panel 25VU make sure that the APU MASTER SW p/bsw is OFF.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-23-14-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-23-14-010-050
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control SW 11LJ to the ON position.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-23-14Page 402 201-210, Aug 01/05
CES 4. Procedure
_________
(Ref. Fig. 401/TASK 49-23-14-991-001) Subtask 49-23-14-020-050
A. Removal of the APU-Inlet Temperature-Sensor
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