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(b) (c) (d)  Lubricate the bolt with engine oil.Install the bolt in the forward hole.Tighten the bolt with your hand only.
 (3)  S 414-014-N00Install the applicable EGT (TT4.95) thermocouple probe (AMM 77-21-01/401).
 (4)  S 434-011-N00Tighten the housing bolt to 54-60 pound-inches (6.1-6.8 newton-meters).
 (5)  S 434-017-N00Install lockwire or the optional safety cable and ferrule to the housing bolt.
 (6)  S 714-019-N00Do the test of the EGT probe that is shown in the Power-Plant Test-Reference Table (AMM 71-00-00/501).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST GAS TEMPERATURE (TT4.95) THERMOCOUPLE HOUSING - INSPECTION/CHECK
________________________________________________________________________
 1.  General
_______
 A.  This task does a check of the exhaust gas temperature (EGT) thermocouple housing.
 B.  There are two EGT (TT4.95) thermocouple housings installed on the turbine exhaust case at the 1 and 7 o'clock positions.
 C.  You must remove the EGT (TT4.95) thermocouple housing to do the
 inspection procedure.

 D.  You must open the applicable core cowl panel to get access to the EGT housing.
 TASK 77-21-05-206-001-N00
 2.  Examine the Exhaust Gas Temperature (TT4.95) Thermocouple Housing (Fig. 601)
_________________________________________________________________
 A.  References
 (1)  
AMM 77-21-05/401, EGT (TT4.95) Thermocouple Housing

 (2)  
IPC 77-21-01 Fig. 5

 B.  
Access

 (1)  
Location Zone 412 Engine 1 - Turbine Exhaust Case 1 or 7 o'clock 422 Engine 2 - Turbine Exhaust Case 1 or 7 o'clock 432 Engine 3 - Turbine Exhaust Case 1 or 7 o'clock 442 Engine 4 - Turbine Exhaust Case 1 or 7 o'clock

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

 C.  
Procedure

 (1)
Remove the EGT (TT4.95) thermocouple housing (AMM 77-21-05/401).

 S 216-003-N00

 (2)  
Visually examine the housing for nicks, dents, cracks, and deformation.

 (a)  
Nicks and dents are permitted.

 (b)  
Heat damage is permitted if you can install the housing or the thermocouple probe.

 

 S 026-002-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  B 
SEE  A  FLANGE S FLANGE T  FLANGE P  FLANGE P  FLANGE T FLANGE S 
CSEE EGT (TT4.95) THERMOCOUPLE HOUSING 
CASE EXHAUST TURBINE  CASE EXHAUST TURBINE 

EGT (TT4.95) THERMOCOUPLE HOUSING
SEE C
FWD  FWD
A B
Exhaust Gas Temperature (TT4.95) Thermocouple Housing Inspection Figure 601 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TEMPERATURE
HOUSING
L-A0725
TEMPERATURE SAMPLING INLET TUBE
DISCHARGE SLOT HOUSING
WIDTH 0.160 INCH0.050 INCH (1.270 MM)

TRAILING  (4.064 MM)

MINIMUM EDGE MINIMUM
B-B
INLET SLOT LENGTH
0.350 INCH (8.890 MM)
　
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