(1)
Location Zone 412 Engine 1 - Diffuser/Combustor Case 2:30 o'clock 422 Engine 2 - Diffuser/Combustor Case 2:30 o'clock 432 Engine 3 - Diffuser/Combustor Case 2:30 o'clock 442 Engine 4 - Diffuser/Combustor Case 2:30 o'clock
(2)
Access Panel
416 Right Thrust Reverser Half - Engine 1
426 Right Thrust Reverser Half - Engine 2
436 Right Thrust Reverser Half - Engine 3
446 Right Thrust Reverser Half - Engine 4
C.
Prepare to Remove the TT3 Probe
S 864-016-N00
(1)
For the applicable engine, open these circuit breakers and install these DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6G15 SCU ALT PWR ENG 1
2) 6G23 ENG SCU 1
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
TURBINE VANE COOLING AIR TUBE (REF) SEE B EEC THERMOCOUPLE PROBE (TT3) HYDRAULIC FLUID LINES (REF)
SEE A
ACCESSORY COOLING AIR SUPPLY TUBE (REF)
A FWD
EEC THERMOCOUPLE GASKET PROBE (TT3) ALUMEL TERMINAL STUDS WASHER (2 LOCATIONS)
DIFFUSER/ COMBUSTOR CASE CHROMEL TERMINAL STUDS COUPLING PROBE BODY NUT NUT WASHER NUT (2 LOCATIONS) (2 LOCATIONS) NUT (2 LOCATIONS)
B
EEC Thermocouple Probe (TT3) Installation
Figure 401
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3) 6G16 SCU ALT PWR ENG 2
4) 6G24 ENG SCU 2
5) 6G17 SCU ALT PWR ENG 3
6) 6G25 ENG SCU 3
7) 6G18 SCU ALT PWR ENG 4
8) 6G26 ENG SCU 4
S 014-018-N00
(2) Open the right fan cowl panel (AMM 71-11-04/201).
S 044-027-N00
WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
EQUIPMENT.
(3)
Do this procedure: Thrust Reverser Deactivation for Ground
Maintenance (AMM 78-31-00/201).
S 014-019-N00
(4)
Open the right core cowl panel (AMM 71-11-06/201).
S 014-028-N00
WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______
THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS,
INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(5)
Open the right thrust reverser (AMM 78-31-00/201).
D.
Procedure
S 024-033-N00
(1)
Remove the TT3 probe:
(a)
Remove the nuts and washers which attach the wire harness to the studs on the TT3 probe.
(b)
Remove the wire harness from the studs on the TT3 probe.
(c)
Remove the TT3 probe from the boss on the diffuser/combustor case.
NOTE: Do not remove the lockwire between the coupling nut
____ and the body nut. Also, do not remove the body nut from the TT3 probe when the probe is removed from the engine.
1) Discard the gasket.
(d) Install a protection cap to the boss on the diffuser/combustor case.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 73-21-14-404-007-N00
3. Install the EEC Thermocouple Probe (TT3 probe) (Fig. 401)
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