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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
DM7353
M7353 EIU-3
DM7352

M7352 EIU-2
DM7198A

DM7351

CH A
DM7198B
M7351 EIU-1 CH B M7198 ELECTRONIC

E2-6 EIU RACK ENGINE CONTROL
AL CH A
AL CH B

EEC OIL TEMPERATURE THERMOCOUPLE PROBE

AL
CH A AL
CH B

NO. 3 BEARING OIL TEMPERATURE THERMOCOUPLE PROBE
Oil Temperature Indicating System Simplified Schematic
Figure 3

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(2)  
The EIU's receive the EEC oil temperature signal and show the engine oil temperature on the auxiliary EICAS display.

 (3)  
The EEC compares the signals from the thermocouple probes for the EEC oil temperature and the No. 3 bearing oil temperature, and finds a differential oil temperature, which is sent to the EIU's for display on the EPCS maintenance page.

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OIL TEMPERATURE INDICATING SYSTEM - ADJUSTMENT/TEST
___________________________________________________
 1.  General
_______
 A.  This procedure gives the instructions to do an operational test of the indicating system for the oil temperature.
 B.  The operational test is done with the engines in operation and is used to make sure the indicating system operates correctly. The operational test is used to make sure the system operates correctly after the replacement of the thermocouple probes for the EEC oil temperature and the No. 3 bearing.
 TASK 79-34-00-715-003-N00
 2.  Operational Test - Oil Temperature Indicating System (Fig. 501)
____________________________________________________
 A.  References
 (1)  
AMM 31-61-00/501, Integrated Display System

 (2)  
AMM 45-10-00/501, Central Maintenance Computer

 (3)  
AMM 71-00-00/201, Power Plant

 (4)  
WDM 79-34-11

 (5)  
SSM 79-34-01

 B.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  
Preconditions

 S 865-006-N00
 (1)  
These conditions are necessary for this task:

 (a)  
Engines in operation (AMM 71-00-00/201).

 (b)  
Engine Indicating and Crew Alert System (EICAS), serviceable (AMM 31-61-00/201).

 (c)  
Central Maintenance Computer System (CMCS), serviceable (AMM 45-10-00/201).

 D.
Do the Test of the Indicating System for the Oil Temperature (after the replacement of the thermocouple probe for the EEC oil temperature)

 S 715-001-N00
 (1)  
With the engines in operation at the same power, make sure the oil temperature indication on the auxiliary EICAS display is approximately the same for each engine.

 E.  
Do the Test of the Indicating System for the Oil Temperature (after the replacement of the thermocouple probe for the No. 3 bearing)

 S 215-004-N00
 (1)  With the engines in operation at the same power, make sure the indication for the differential oil temperature (SCAV) on the EPCS maintenance page is approximately the same for each engine.
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