TVBCA VALVE CROSS-SECTIONAL VIEW TVBCA VALVE POSITION SWITCH
A-A CROSS-SECTIONAL VIEW
B-B
Turbine Cooling System Component Location
Figure 1 (Sheet 3)
E71976
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-24-00
ALL ú ú N03 Page 4 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SOLENOID FOR THE
HPC SECONDARY INTERMEDIATE
FLOW CONTROL CASE
VALVE 1
OR
TVCA VALVE 2
SERVO FUEL SERVO FUEL L-A2578 SUPPLY PORT RETURN PORT
TURBINE CASE COOLING
AIR VALVE ACTUATOR
TVBCA VALVE SOLENOID
E
FWD
HPC SECONDARY
FLOW CONTROL OR TVCA VALVE AND
TVBCA VALVE SOLENOID
F
2.9 BLEED
VALVE DUCT
(REF)
TOP LEFT PS3 AIR FILTER
FWD
LOWER LEFT PS3 AIR FILTER
VALVE FOR THE TURBINE VANE COOLING AIR
G
TVCA VALVE H2
Turbine Cooling System Component Location Figure 1 (Sheet 4)
E71984
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-24-00
ALL ú ú N03 Page 5 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SOLENOID FOR THE TVBCA
VALVE AND IDG AIR/OIL
HEAT EXCHANGER VALVE
INTERMEDIATE
CASE
FAN EXIT
LINER
SEGMENT
IDG AIR/OIL HEAT EXCHANGER VALVE OVERRIDE PRESSURE SWITCH FWD
I SOLENOID FOR THE TVBCA VALVE AND IDG/AIR OIL HEAT EXCHANGER VALVE
RIGHT 2.9 BLEED VALVE
PS3 AIR FILTER TOP RIGHT
LOWER RIGHT PS3 AIR FILTER
FWD J Turbine Cooling System Component Location Figure 1 (Sheet 5)
E72009
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-24-00
ALL ú ú N03 Page 6 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
6. High Pressure Turbine Case Cooling Manifolds (Fig. 1)
____________________________________________
A. The HPT case cooling manifolds (air tubes) include many air bleed holes
which flow cooling air externally on the HPT case. The cooling air
decreases the turbine case growth due to thermal expansion.
B. The manifold for the HPT case cooling includes four air tubes, which are
installed circumferentially around the HPT case. Each air tube is made
of two halves. The four air tubes, or eight air tube halves, are
longitudinally split which makes replacement of individual tube sections
easier.
7. Low Pressure Turbine Case Cooling Manifolds (Fig. 1)
___________________________________________
A. ENGINES WITH PHASE 3 OR PRE-PW-SB 75-53; The manifold for the LPT case cooling includes seven air tubes (or 14 air tube halves), which are installed circumferentially around the LPT case.
B. ENGINES WITHOUT PHASE 3 OR POST-PW-SB 75-53;
The manifold for the LPT case cooling includes six air tubes (or 12 air
tube halves), which are installed circumferentially around the LPT case.
C. The function of the LPT case cooling manifolds are similar to the HPT
case cooling manifolds.
8. Turbine Case Cooling Air Valve Actuator (Fig. 1)
_______________________________________
A. The TCC air valve actuator, which is hydraulically operated, mechanically moves the shutoff valves for the HPT and LPT case cooling air through a push-pull cable.
B. The TCC air valve actuator, which is installed on the HPC forward case at the 2 o'clock position, is installed on a free floating bracket in case of thermal growth of the control cable.
C. The TCC air valve actuator includes a dual coil torque motor, a pilot valve, actuator, and dual linear variable differential tranformers (LVDT) which supply redundant feedback signals of the actuator position to the electronic engine control (EEC).
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 大气 AIR 1(27)
