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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
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 (2)  Open the applicable core cowl panel (AMM 71-11-06/201). (a) Open the right core cowl panel to get access to the EGT probes at the 1 or 4 o'clock position. (b) Open the left core cowl panel to get access to the EGT probes at the 7 or 10 o'clock position.
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 (3)  Visually examine all the surfaces of the EGT probe for cracks. (a) Replace the EGT probe if you find cracks (AMM 77-21-01/401).
 NOTE:____ Do not replace the EGT probe for small nicks only.
 S 216-005-N00
 (4)  Visually examine the terminals on the EGT probe for thread damage.
 S 216-015-N00
 (5)  Examine the EGT probes for loose studs. (a) Replace the EGT probe if the terminals are loose or damaged (AMM 77-21-01/401).
 S 416-006-N00
 (6)  Close the applicable core cowl panel (AMM 71-11-06/201).
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 (7)  For the applicable engine, remove the DO-NOT-CLOSE tags and close these circuit breakers on the main power distribution panel, P6: (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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TASK 77-21-01-766-008-N00
 3. EGT Thermocouple Probe Continuity and Insulation Resistance Check (Fig. 601)
_________________________________________________________________
 A. Standard Tools and Equipment
 (1)  
Electronic Multimeter - Model 2795: Simpson Electric Co., American Gage and Machine Co., (Kathy Industries Inc), 853 Dundee Avenue, Elgin, IL 60120

 (2)  
Heat Gun - capable of 700°F (371°C) maximum heat range

 B.
References

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

 (2)  
AMM 77-21-01/701, Exhaust Gas Temperature (TT4.95) Thermocouple Probe

 (3)  
IPC 77-21-01, Fig. 5

 (4)  
IPC 77-21-03, Fig. 1

 C.
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

 D.
Procedure

 (1)  
Clean the EGT probe (AMM 77-21-01/701).

 (2)
Apply heat at the junctions of the EGT probe with a heat gun.

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 (3)  Do a continuity check in circuits A and B at the terminal studs.
 NOTE:____ If the needle on the meter moves, there is continuity in the EGT (TT4.95) thermocouple circuits.
 (a)  If the needle does not move, replace the EGT probe (AMM 77-21-01/401).
 S 766-012-N00
 (4)  Do an insulation resistance check between the chromel terminal stud and the body of the EGT probe (for a minimum of 25 seconds). (a) Make sure the resistance is more than 50,000 ohms (minimum). (b) Replace the EGT probe if the resistance is less than 50,000 ohms (AMM 77-21-01/401).
 S 766-016-N00
 (5)  Do an insulation resistance check between the alumel terminal stud and the body of the EGT probe (for a minimum of 25 seconds). (a) Make sure the resistance is more than 50,000 ohms (minimum). (b) Replace the EGT probe if the resistance is less than 50,000 ohms (AMM 77-21-01/401).
　
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