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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FLANGE M
BOLT AND NUT (3 LOCATIONS)  WASHER, BOLT, 
BOLT,  AND NUT 
WASHER AND NUT 
(3 LOCATIONS) 
HEAT SHIELD 
ACCESSORY 
HEAT SHIELD  COOLING 
FLANGE M  SUPPORT  BOLT,  AIR TUBE 
BRACKET  BRACKET  WASHERS, 
BRACKET SUPPORT  HEAT SHIELD START VALVE  AND NUT  AND NUT WASHERS, BOLT, 

BOLT, BRACKET
WASHERS, AND NUT FWD
M
BOLT, WASHERS, NUT, AND CLAMP
TUBE NUT
MAIN
GEARBOX BOLT AND (REF) WASHER FWD
BOLT, WASHER,
CENTER HPT AND NUT
N
CASE COOLING AIR
BOLT TUBE (2 LOCATIONS)
AND NUT HPT COOLING AIR
BOLT AND NUT
BRACKET  TUBE BRIDGE BRACKET (4 LOCATIONS)
BOLT AND NUT
BRACKETBOLT AND NUT (2 LOCATIONS)
AFT HPT CASE COOLING AIR TUBE FORWARD HPT CASE
FLANGE N FLANGE M COOLING AIR TUBEBRACKET
A-A
BRACKET L-A0722
(6 LOCATIONS)
High Pressure Turbine Case Cooling Manifolds Installation
Figure 401 (Sheet 5)

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(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

 C.
Prepare to Remove the Cooling Manifolds for the HPT Case

 S 044-088-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).

 S 014-087-N00

 (2)  
Open the core cowl panels (AMM 71-11-06/201).

 D.
Remove the Cooling Manifolds for the HPT Case

 S 014-003-N00
 (1)  For the forward cooling air tubes, remove the lower support link for the pneumatic manifold with the steps that follow (view C):
 (a)  
Remove the bolt, washer, and nut which attach the support link to the flange M bracket.

 (b)  
Remove the nut and washer which attach the support link to the pneumatic manifold.

 (c)  
Remove the support link from the engine.

 (d)  
Install the washer and nut, which were removed, at the pneumatic manifold. 1) Tighten the nut with your hand.

 S 014-004-N00
 (2)  For the lower aft, upper forward, and upper center forward cooling air tubes, remove the engine fire detector element and support tube (AMM 26-11-02/401).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 014-100-N00
 (3)  
ENGINES PRE-PW-SB 79-76; Remove the oil pressure tube for the No. 4 bearing with the steps that follow (Views A and E):

 (a)  
Remove the clamps which attach the spray shield at the tube nut forward of Flange M at approximately the 10 o'clock position.

 (b)  
Remove the spray shield from the engine.

 (c)  
Disconnect the tube nut forward of Flange M from the coupling.

 (d)  
Remove the hose clamps which attach the spray shield to the rear connection rearward of Flange P at approximately the 10:30 position.

 (e)  
Remove the spray shield from the engine.

 (f)  
Disconnect the tube nut aft of Flange P from the coupling.
　
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