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(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 79-31-40-010-054
B. Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
4. Procedure
_________
Subtask 79-31-40-760-050
A. Electrical Test of the Oil Temperature Sensor.
(1) Disconnect the connector from the oil temperature sensor. Use soft-nose connector pliers only if necessary.
(2) Check the resistance values as follows. If they are different from the values given, replace the oil temperature sensor (Ref. TASK 79-31-40-000-002) and (Ref. TASK 79-31-40-400-002).
(a) Measure the resistance of each probe with a digital multimeter. The resistance value must be between 200 and 278 Ohms, at ambient temperature.
(b) Measure the insulation resistance of each probe. The nominal value must be equal to or higher than 10 Megohms.
(3) Connect the connector to the oil temperature sensor. Use soft-nose connector pliers only if necessary.
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________ Subtask 79-31-40-410-053
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the warning notice(s).
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OIL TEMPERATURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
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1. Oil Temperature Sensors
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The oil temperature is measured at two engine locations :
- One for the engine condition monitoring
- One for the cooling system control of the Integrated Drive Generator.
A. Oil Temperature Sensor for the Engine Condition Monitoring (signal to EIU) (Ref. Fig. 001, 002)
- The oil temperature sensor (for the EIU) is located on the main oil pressure filter housing of the lubrication unit, downstream of the pressure pump oil system.
R - The oil temperature is sensed by a single element. The unit consists of R a sealed, wire-wound resistance element. This element causes a linear change in the DC resistance when exposed to a temperature change.
- Temperature measurement range :
- 70 deg.C to 300 deg.C (-94 deg.F to 572 deg.F).
B. Engine Oil Temperature Sensor for the IDG Cooling System Control (Signal to ECU) (Ref. Fig. 003, 004)
(1) General The oil temperature sensor (for the ECU) is located above the oil tank and on the oil supply tube to the forward bearing sump which runs at 9 O'clock, aft looking forward. The sensor is a dual type thermocouple (Chromel/alumel).
(2) Description The oil temperature sensor is composed of the following :
- A metal body including : A fixed connector. A shoulder which ensures seating of the thightening nut. A cylindrical part provided with a groove which accommodates a seal for sensor thightness. A cylindrical boss in which are inserted the 2 hot junctions of the thermocouples (immersed section).
- A nut to secure the sensor on the oil tube.
(3) Operation Each thermocouple is inserted in the sensor. It generates an electromotive force proportional to the surrounding temperature (oil temperature) of the hot junctions. Both signals (channel A and B) are routed to the ECU.
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Oil Temperature Sensor Location on the Lubrication Unit (Engine Condition
Monitoring)
Figure 001
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Oil Temperature Sensor Location on the Lubrication Unit (Engine Condition
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