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 S 766-013-N00
 (6)  Apply heat at 600-700°F (316-371°C) with a heat gun to the secondary junctions of the EGT probe.
 S 216-017-N00
 (7)  Examine the needle on the meter for movement for each set of terminal studs.
 (a)  If the needle on the meter moves, replace the EGT probe (AMM 77-21-01/401).

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 77-21-01
 ALL  ú ú N02 Page 606 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST GAS TEMPERATURE (TT4.95) THERMOCOUPLE PROBE - CLEANING/PAINTING
_______________________________________________________________________
 1.  General
_______
 A.  This procedure includes the task to clean the exhaust gas temperature (TT4.95) thermocouple probe.
 B.  There are four exhaust gas temperature (EGT) thermocouple probes. The EGT probes are installed on the turbine exhaust case at the 1, 4, 7, and 10 o'clock positions.
 C.  To get access to the EGT probes, you must open the applicable core cowl panel.
 TASK 77-21-01-107-001-N00
 2.  Clean the Exhaust Gas Temperature (TT4.95) Thermocouple Probe (Fig. 701)
_____________________________________________________________
 A.  Standard Tools and Equipment
 (1)  
Air Source - Compressed, Dry, Filtered - 100 psi (700 kPa)

 (2)  
Brush - Stiff Bristle, Nonmetallic, Stanley Home Products, 116 Pleasant St., Easthampton, MA 01027

 B.  
Consumable Materials

 (1)  
G00834 Cloth - Cotton, Lint-free

 (2)  
B00448 Solvent - 1,1,1 Trichloroethane Inhibited, MIL-T-81533

 C.  
References

 (1)  
AMM 77-21-01/401, Exhaust Gas Temperature (TT4.95) Thermocouple Probe

 (2)  
IPC 77-21-01, Fig. 5

 (3)  
IPC 77-21-03, Fig. 1

 D.  
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
 ALL  ú ú N01 Page 701 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 P  FLANGE P  FLANGE S 
FLANGE T  FLANGE T 

EGT (TT4.95) THERMOCOUPLE PROBE (4 LOCATIONS)
SEE C SEE C
TURBINE EXHAUST CASETURBINE EXHAUST CASE
SEE C
SEE C
FWD  FWD
A B
Exhaust Gas Temperature (TT4.95) Thermocouple Probe Cleaning Figure 701 (Sheet 1)
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 77-21-01
 ALL  ú ú N01 Page 702 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
0.040 INCH (1.016 mm) STANDARD ID TO 0.058 INCH (1.473 mm) CONNECTOR OD TUBE (STAINLESS STEEL)

ALUMEL STUDS

L-A0446
Exhaust Gas Temperature (TT4.95) Thermocouple Probe Cleaning
Figure 701 (Sheet 2)

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