75-24-15
ú ú N01 Page 409 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TURBINE VANE COOLING AIR VALVE - REMOVAL/INSTALLATION
_____________________________________________________
1. General
_______
A. This procedure is for engines with the Phase 3 changes. Engines without the Phase 3 changes do not have this valve.
B. This procedure gives the instructions for the removal and the
installation of the Turbine Vane Cooling Air (TVCA) valve.
C. The TVCA valve is found on the HPC case on the right side of the engine at the 2:30 o'clock position.
D. You can get access to the TVCA valve through the right thrust reverser half.
TASK 75-24-16-004-001-N00
2. Remove the Turbine Vane Cooling Air Valve (Fig. 401)
_________________________________________
A. References
(1)
AMM 71-11-04/201, Fan Cowl Panel
(2)
AMM 71-11-06/201, Core Cowl Panel
(3)
AMM 78-31-00/201, Thrust Reverser System
B.
Access
(1)
Location Zones
412 Engine 1 - HPC Rear Case
422 Engine 2 - HPC Rear Case
432 Engine 3 - HPC Rear Case
442 Engine 4 - HPC Rear Case
(2)
Access Panels
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 TVCA Valve
S 044-002-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.
(1)
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
(2)
Open the right fan cowl panel (AMM 71-11-04/201).
(3)
Open the right core cowl panel (AMM 71-11-06/201).
S 014-003-N00
S 014-004-N00
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES ú
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ú ú N01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
TURBINE VANE COOLING AIR (TVCA) VALVE
SEE B
FWD
A
Valve for the Turbine Vane Cooling Air - Installation
Figure 401 (Sheet 1)
D21773
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES ú
75-24-16
ú ú N01 Page 402 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Valve for the Turbine Vane Cooling Air - Installation
Figure 401 (Sheet 2)
D21777
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 014-005-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.
(4)
Open the right thrust reverser (AMM 78-31-00/201).
D.
Procedure
S 024-031-N00
(1)
Remove the TVCA valve.
(a)
Remove the lockwire from the tube nut of the air signal tube.
(b)
Disconnect the air signal tube from the TVCA valve.
(c)
Remove the bolts that attach the flange of right TVCA duct to the TVCA valve. 1) Discard the gasket.
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