S 714-060-N00
 (7)  Do the test of the EGT box and cable that is shown in the Power-Plant Test-Reference Table (AMM 71-00-00/501).
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 77-21-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST GAS TEMPERATURE (TT4.95) THERMOCOUPLE CABLE TERMINAL BOX-
_________________________________________________________________ INSPECTION/CHECK
________________
 1.  General_______
 A.  This task does a visual examination of the exhaust gas temperature (EGT) thermocouple cable terminal box.
 B.  The EGT thermocouple cable terminal box is installed on the turbine exhaust case at the 5 o'clock position.
 C.  You must open the core cowls to get access to the EGT thermocouple cable terminal box.
 TASK 77-21-04-206-001-N00
 2.  Examine the Exhaust Gas Temperature (TT4.95) Thermocouple Cable Terminal Box____________________________________________________________________________ (Fig. 601)
 A.  Consumable Materials
 (1)  
D00390 Oil - Engine

 B.  
References

 (1)  
AMM 71-00-00/501, Power Plant

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

 (3)  
IPC 77-21-04 Fig. 1

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Turbine Exhaust Case 5 o'clock 422 Engine 2 - Turbine Exhaust Case 5 o'clock 432 Engine 3 - Turbine Exhaust Case 5 o'clock 442 Engine 4 - Turbine Exhaust Case 5 o'clock

 (2)  
Access Panel
 418 Right Core Cowl Panel - Engine 1
 428 Right Core Cowl Panel - Engine 2
 438 Right Core Cowl Panel - Engine 3
 448 Right Core Cowl Panel - Engine 4

 D.  
Procedure

 S 866-016-N00
 (1)  For the applicable engine, open these circuit breakers on the main power distribution panel, P6, and install the DO-NOT-CLOSE tags:
 (a)  
6G15 SCU ALT PWR ENG 1

 (b)  
6G23 ENG SCU 1

 (c)  
6G16 SCU ALT PWR ENG 2

 (d)  
6G24 ENG SCU 2

 (e)  
6G17 SCU ALT PWR ENG 3

 (f)  
6G25 ENG SCU 3

 (g)  
6G18 SCU ALT PWR ENG 4

 (h)  
6G26 ENG SCU 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 S 
FLANGE T 
SEE  A 

TURBINE EXHAUST CASE
EGT (TT4.95) THERMOCOUPLE CABLE
EEC  GROUND 
HARNESS  LEAD  NUT - ALUMEL STUD 
EGT (TT4.95)  (2 LOCATIONS) 
THERMOCOUPLE CABLE TERMINAL BOX  (2 LOCATIONS) NUT - CHROMEL STUD 
SEE  B 

SCREW (2 LOCATIONS) FWD
A
GROUND TERMINAL
COVER
EGT (TT4.95) THERMOCOUPLE CABLE TERMINAL STUD (4 LOCATIONS)
SCREW
(2 LOCATIONS) FLANGE P BRACKET SCREW (2 LOCATIONS)
OUTER CLAMP HALF
EGT (TT4.95)
THERMOCOUPLE
RIGHT EGT (TT4.95)
CABLE TERMINAL
THERMOCOUPLE
BOX
CABLE HALF
LEFT EGT (TT4.95) THERMOCOUPLE INNER CLAMP HALF
CABLE HALF
B
L-A3849
Exhaust Gas Temperature (TT4.95) Thermocouple Cable Terminal Box Inspection Figure 601
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 ALL  ú ú N01 Page 602 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(2)  S 016-003-N00Open the right core cowl panel (AMM 71-11-06/201).
 (3)  S 036-004-N00Remove the screws that attach these components to the EGT terminal box: (a) The EGT terminal box cover (b) The EGT harness ground lead (c) The inner clamp half (d) The outer clamp half.
　
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