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77-21-04
ALL ú ú N01 Page 703 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) Tighten the nuts on the chromel studs (the smaller nuts) to 15-18 pound-inches (1.7-2.0 newton-meters).
S 437-018-N00
(8) Install the clamp halves:
(a)
Put the inner clamp half and the outer clamp half in position around the thermocouple cables.
(b)
Lubricate the clamp screws with engine oil.
(c)
Install the clamp screws.
(d)
Tighten the clamp screws to 16-22 pound-inches
(1.8-2.5 newton-meters).
S 437-019-N00
(9) Install the terminal box cover:
(a)
Lubricate the cover screws with engine oil.
(b)
Put the ground lead of the EEC harness between the hole on the top aft corner of the terminal box cover and the terminal box.
(c)
Put the cover in its position on the terminal box.
(d)
Install the screws.
(e)
Tighten the screws to 16-22 pound-inches
(1.8-2.5 newton-meters).
(f)
Install lockwire between the cover screws and the clamp screws.
NOTE: Do not install lockwire between the inner clamp screw
____
and the outer clamp screw.
S 417-012-N00
(10)
Close the right core cowl panel (AMM 71-11-06/201).
S 867-013-N00
(11)
For the applicable engine, remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P414 Main Power Distribution Panel
1) 414D21 EEC GND TEST ENG 1
2) 414D22 EEC GND TEST ENG 2
3) 414D23 EEC GND TEST ENG 3
4) 414D24 EEC GND TEST ENG 4
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 717-021-N00
(12) Do the test of the EGT box and cable that is shown in the Power-Plant Test-Reference Table (AMM 71-00-00/501).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
77-21-04
ALL ú ú N01 Page 705 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST GAS TEMPERATURE (TT4.95) THERMOCOUPLE HOUSING -
_______________________________________________________ REMOVAL/INSTALLATION
____________________
1. General_______
A. This procedure has two tasks. One task is the removal of the exhaust gas temperature (EGT) thermocouple housing. The other task is the installation of the housing.
B. There are two EGT (TT4.95) thermocouple housings installed on the turbine exhaust case at the 1 and 7 o'clock positions.
C. You must remove the applicable EGT (TT4.95) thermocouple probe before you remove the housing.
D. You must open the applicable core cowl panel to get access to the housing.
TASK 77-21-05-004-001-N00
2. Exhaust Gas Temperature (TT4.95) Thermocouple Housing Removal (Fig. 401)_____________________________________________________________
A. References
(1)
AMM 77-21-01/401, EGT (TT4.95) Thermocouple Probe
(2)
IPC 77-21-01 Fig. 5
B.
Access
(1)
Location Zone 412 Engine 1 - Turbine Exhaust Case 1 or 7 o'clock 422 Engine 2 - Turbine Exhaust Case 1 or 7 o'clock 432 Engine 3 - Turbine Exhaust Case 1 or 7 o'clock 442 Engine 4 - Turbine Exhaust Case 1 or 7 o'clock
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