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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST GAS TEMPERATURE (TT4.95) THERMOCOUPLE PROBE -
_____________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure includes two tasks. One task is for the removal of the exhaust gas temperature (EGT) (TT4.95) thermocouple probe (EGT probe). The other task is for the installation of the EGT probe.
 B.  There are four EGT probes installed on the turbine exhaust case.
 C.  The EGT probes are installed at the 1, 4, 7, and 10 o'clock positions (one probe is at each position).
 D.  The EGT probes at the 1 and 7 o'clock positions are installed in an EGT probe housing.
 E.  The EGT probes at the 4 and 10 o'clock positions are installed in a combined EGT and EPR housing.
 F.  You must open the applicable core cowl panel to get access to the EGT probes.
 TASK 77-21-01-004-031-N00
 2.  Exhaust Gas Temperature (TT4.95) Thermocouple Probe Removal (Fig. 401)___________________________________________________________
 A.  References
 (1)
AMM 71-11-06/201, Core Cowl Panels

 (2)
IPC 77-21-01 Fig. 5

 (3)
IPC 77-21-03 Fig. 1

 B.  
Access

 (1)  
Location Zone 412 Engine 1 - Turbine Exhaust Case 1, 4, 7, or 10 o'clock 422 Engine 2 - Turbine Exhaust Case 1, 4, 7, or 10 o'clock 432 Engine 3 - Turbine Exhaust Case 1, 4, 7, or 10 o'clock 442 Engine 4 - Turbine Exhaust Case 1, 4, 7, or 10 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

 

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 77-21-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 P  FLANGE P 
FLANGE S  FLANGE S 
FLANGE T  FLANGE T 

1. EGT (TT4.95) 
THERMOCOUPLE 
PROBE 
(4 PLACES) 
SEE  C 
SEE  E 
TURBINE 
EXHAUST 
CASE  TURBINE 
EXHAUST 
CASE 

SEE D
SEE  F 
FWD  FWD 
A  B 

Exhaust Gas Temperature (TT4.95) Thermocouple Probe Installation
Figure 401 (Sheet 1)

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 77-21-01
 ALL  ú ú N01 Page 402 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
2. NUT-ALUMEL STUD  3. NUT-CHROMEL STUD  2. NUT-ALUMEL STUD 
8. WASHER (2 LOCATIONS)  (2 LOCATIONS)  (2 LOCATIONS)  8. WASHER  (2 LOCATIONS) 
(2 LOCATIONS) 
4. WASHER 1. EGT (TT4.95) (2 LOCATIONS) PROBE THERMOCOUPLE  3. NUT-CHROMEL STUD (2 LOCATIONS) 

4. WASHER
5. HARNESS (2 LOCATIONS)
LEADS
7. BRACKET  5. HARNESS LEADS
6. BOLT (2 LOCATIONS)
1. EGT (TT4.95) THERMOCOUPLE PROBE
6. BOLT (2 LOCATIONS) 7. BRACKET
1 O'CLOCK POSITION
9. PT4.95
C
PRESSURE2. NUT-ALUMEL STUD MANIFOLD (2 LOCATIONS) 10. PT4.95
4 O'CLOCK POSITION
PRESSURE
3. NUT-8. WASHER
MANIFOLD NUT  D CHROMEL STUD (2 LOCATIONS) (2 LOCATIONS) 2. NUT-ALUMEL STUD
3. NUT-(2 LOCATIONS)
CHROMEL STUD 8. WASHER (2 LOCATIONS) (2 LOCATIONS)
4. WASHER (2 LOCATIONS)
4. WASHER
(2 LOCATIONS) PRESSURE PROBE ADAPTER
6. BOLT (2 LOCATIONS)
11. BRACKET
1. EGT (TT4.95) THERMOCOUPLE PROBE
1. EGT (TT4.95)
6. BOLT THERMOCOUPLE (2 LOCATIONS)PROBE
　
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