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(c)  
Remove the bolts which attach the aft flange of the TVC air duct and bracket to the boss on the HPT case.

 (d)  
Remove the bolts, nuts, and clamp which attach the TVC air duct to the bracket on the flange M.

 (e)  
Remove the TVC air duct from the engine. 1) Discard the gasket from the front of the duct. 2) ENGINES WITHOUT PHASE 3 CHANGES OR PRE-PW-SB 72-315 OR

 PRE-PW-SB 75-57;
 Discard the metering orifice seal plate from the rear of
 the duct.

 3)  ENGINES WITH PHASE 3 CHANGES OR POST-PW SB 72-315 OR POST-PW-SB 75-57; Discard the gaskets from the rear of the duct.
 (f)  Install the protection caps to the TVC air duct, HPT case opening, and TVBCA valve port.
 TASK 75-24-02-004-019-N00
 4.  Remove the No. 3 Turbine Vane Cooling Air Duct (Fig. 402)
______________________________________________
 A.  References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
IPC 71-00-50 Fig. 1

 (5)  
IPC 75-24-07 Fig. 1

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Aft HPC Case to Fwd HPT Case
 422 Engine 2 - Aft HPC Case to Fwd HPT Case
 432 Engine 3 - Aft HPC Case to Fwd HPT Case
 442 Engine 4 - Aft HPC Case to Fwd HPT Case

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
NO. 4 TVC
LEFT TURBINE VANE AIR DUCT

SEE B
AND BLADE COOLING
AIR (TVBCA) VALVE

SEE C FIRE DETECTOR SUPPORT BRACKET ENGINE
SEE F
SEE G
PNUEMATIC
SEE E DEOILER LINE SUPPORT
OUTLET TUBE BRACKET NO. 3 TVC
AIR DUCT SEE D
ENGINE OIL TANK SCUPPER DRAIN TUBE
FWD
A
Turbine Vane Cooling Air Duct Installation - Left Side
Figure 402 (Sheet 1)

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BOLT
(6 LOCATIONS)

METERING ORIFICE SEAL PLATE
BOLT GASKET
(6 LOCATIONS)
GASKET

2 NO. 4 TVC 1 AIR DUCT
B  NO. 4 TVC 3 AIR DUCT
C
MAIN OIL
FILTER TUBE

CLAMP, DEOILER OUTLET BOLT, TUBE CLAMP NUT NUT
IDG HEAT SHIELD
(2 LOCATIONS) BOLT
DIFFUSER BRACKET (2 LOCATIONS)
CASE
BOLT
(3 LOCATIONS) NO. 4 TVC
MAIN BRACKET AIR DUCT
GEARBOX
BRACKET CLAMP EEC ALTERNATOR LEADS
NUT BOLTNO. 3 TVC
(2 LOCATIONS)  (2 LOCATIONS)
AIR DUCT
D E
1
ENGINES WITHOUT PW SB 72-315
2
ENGINES WITH PW SB 72-315
OR WITH PHASE 3 CHANGES

L-A3964 L-A2965 ENGINES WITH PW SB 75-57
3
Turbine Vane Cooling Air Duct Installation - Left Side
Figure 402 (Sheet 2)

E25471
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
　
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