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 B.  The EGT (TT4.95) thermocouple cable has a right and left half. The EGT (TT4.95) thermocouple cable connects the EGT thermocouple probes on the turbine exhaust case at the 1, 4, 7, and 10 o'clock positions to the terminal box on the turbine exhaust case at the 5 o'clock position.
 C.  You can get access to the EGT (TT4.95) thermocouple cable through the core cowl panels.
 D.  The electrical checks given in this procedure are only as good as the ohmmeter which is used. You must not use this ohmmeter to find the correct wire resistances of the thermocouple cable halves. But, you can use it to find failures such as open or intermittent circuits, and metal-to-metal short circuits.
 TASK 77-21-02-216-030-N00
 2.  Examine the Exhaust Gas Temperature (TT4.95) Thermocouple Cable (Fig. 601)
_______________________________________________________________
 A.  References
 (1)
AMM 71-00-00/501, Power Plant

 (2)
AMM 71-11-06/201, Core Cowl Panels

 (3)
AMM 73-21-07/601, EEC Wiring Harness

 (4)  
AMM 77-21-02/401, Exhaust Gas Temperature (TT4.95) Thermocouple Cable

 (5)  
AMM 77-21-04/601, Exhaust Gas Temperature (TT4.95) Thermocouple Cable Terminal Box

 (6)
AMM 78-31-00/201, Thrust Reverser System

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Turbine Exhaust Case
 422 Engine 2 - Turbine Exhaust Case
 432 Engine 3 - Turbine Exhaust Case
 442 Engine 4 - Turbine Exhaust Case

 (2)  
Access Panel
 417 and 418 Core Cowl Panels - Engine 1
 427 and 428 Core Cowl Panels - Engine 2
 437 and 438 Core Cowl Panels - Engine 3
 447 and 448 Core Cowl Panels - Engine 4

 C.  
Procedure

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FLANGE P  FLANGE P 
FLANGE S  FLANGE S 
FLANGE T  FLANGE T 

EGT (TT4.95) THERMOCOUPLE
SEE A PROBE (4 LOCATIONS)
SEEC D SEEC D
SEE B
TURBINE EXHAUST TURBINE
CASE EXHAUST CASE
SEEC D
NUT-ALUMEL STUD
WASHER (2 LOCATIONS)
(2 LOCATIONS)
NUT-CHROMEL STUD

SEEC D(2 LOCATIONS)
WASHER (2 LOCATIONS)
A FWD B FWD
EGT (TT4.95) THERMOCOUPLE HARNESS LEADS
BRACKET SEE E
EGT (TT4.95) THERMOCOUPLE PROBE STUD
BOLT (4 LOCATIONS)
(2 LOCATIONS)

EGT (TT4.95) THERMOCOUPLE PROBE
(EXAMPLE)

C
Exhaust Gas Temperature (TT4.95) Thermocouple Cable Inspection
Figure 601 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
WASHER (2 LOCATIONS)
NUT-ALUMEL STUD (2 LOCATIONS)
NUT-CHROMEL STUD (2 LOCATIONS)
WASHER (2 LOCATIONS)
EGT (TT4.95) THERMOCOUPLE BRACKET
CABLE HARNESS LEADS
(2 LOCATIONS) BOLT EGT (TT4.95) THERMOCOUPLE PROBE (EXAMPLE)  EGT (TT4.95) THERMOCOUPLE PROBE STUD (4 LOCATIONS) 
C  GROUND LEAD 
EEC HARNESS  (2 LOCATIONS) NUT-ALUMEL STUD 
(2 LOCATIONS) NUT-CHROMEL STUD 

SCREW (2 LOCATIONS)
GROUND
TERMINAL
COVER
FLANGE P BRACKET
SCREW (2 LOCATIONS)
SCREWEGT (TT4.95)
(2 LOCATIONS)THERMOCOUPLE CABLE TERMINAL OUTER CLAMPBOX HALF
THERMOCOUPLE HARNESS
INNER CLAMP HALF
EGT (TT4.95) THERMOCOUPLE CABLE TERMINAL BOX D
Exhaust Gas Termperature (TT4.95) Thermocouple Inspections Figure 601 (Sheet 2)
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