(10) Remove the four nuts (21 and 22) that attach the harness leads of the EEC thermocouple cable (20), right thermocouple cable (1), and left thermocouple cable (2) to the terminal box studs.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 034-024-N00
(11) Remove the EEC harness leads, right harness leads, and left harness leads from the terminal box studs.
NOTE: Temporarily install the nuts (21 and 22) on the terminal box
____ studs after you remove the three thermocouple cable harnesses.
S 034-025-N00
(12)
Remove the screws (25) that attach the outer clamp half (26) and inner clamp half (27) to the terminal box.
S 034-026-N00
(13)
Remove the thermocouple cables from the two clamp halves (26 and 27).
NOTE: After you remove the thermocouple cables, temporarily install
____ the outer clamp half (26) on the inner clamp half (27) and the terminal box with the screws (25).
S 414-014-N00
(14)
Temporarily install the cover (24) on the terminal box with the screws (23).
S 024-004-N00
(15)
Remove the right thermocouple cable (1) from the turbine exhaust case of the engine.
TASK 77-21-02-404-028-N00
3. Install the Exhaust Gas Temperature (TT4.95) Thermocouple Cables
________________________________________________________________
A. Consumable Materials
(1) D00390 Oil - Engine
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B. References
(1)
AMM 27-62-00/201, Speed Brake Control System
(2)
AMM 71-00-00/501, Power Plant
(3)
AMM 71-11-06/201, Core Cowl Panels
(4)
AMM 78-31-00/201, Thrust Reverser System
C.
Access
(1)
Location Zone
412 Engine 1 - Turbine Exhaust Case
422 Engine 2 - Turbine Exhaust Case
432 Engine 3 - Turbine Exhaust Case
442 Engine 4 - Turbine Exhaust Case
(2)
Access Panel
417 and 418 Core Cowl Panels - Engine 1
427 and 428 Core Cowl Panels - Engine 2
437 and 438 Core Cowl Panels - Engine 3
447 and 448 Core Cowl Panels - Engine 4
D.
Install the Left Thermocouple Cable (Fig. 401).
S 034-029-N00
(1)
Remove the four nuts (3 and 4) and washers (5 and 8) from the thermocouple probe studs at the 7 and 10 o'clock positions on the turbine exhaust case.
S 424-030-N00
(2)
Attach the harness leads of the left thermocouple cable to each set of thermocouple studs with the washers (5 and 8) and nuts (3 and 4).
NOTE: Align the harness leads to make them parallel to each other
____
before you tighten the nuts (3 and 4).
S 434-000-N00
CAUTION: DO NOT TIGHTEN THE NUTS MORE THAN THE MAXIMUM TORQUE THAT IS
_______ SPECIFIED. TOO MUCH TORQUE ON THE NUTS CAN LOOSEN OR CAUSE DAMAGE TO THE THERMOCOUPLE STUDS.
(3) Tighten the nuts (3 and 4) to the correct torque as follows:
(a) Tighten the nuts on the alumel (larger diameter) thermocouple probe studs to 18-22 pound-inches (2.0-2.5 newton-meters).
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