747-400 AMM 飞机维护手册 发动机 ENGINE 2(99)

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 A.  The turbine exhaust case, which is a main structural support member for the engine, is attached to the external rear flange of the LPT case, and provides a housing for the No. 4 bearing. The structural case also provides the aft power plant to strut attachment point and rear attachment points for the ground handling.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
LOW PRESSURE TURBINE
SEE A
TURBINE  A 
SHAFT 
A 
A 
ROTATING AIRSEAL  L-A0669 
OF THE 4TH-STAGE  5TH-STAGE REAR 
LPT  TURBINE HUB 
4TH-STAGE 
RING OF THE INNER SEALING  3RD-STAGE LPT DISK  LPT DISK  OF THE 5TH-STAGE LPT ROTATING AIRSEAL 
3RD-STAGE LPT 
6TH-STAGE 
LPT DISK 
TRANSITION 
DUCT AREA 

TURBINE (LPT) CASE BLADES OF THE LOW PRESSURE TURBINE (LPT)
VANE CLUSTERS OF
THE LOW PRESSURE
TURBINE (LPT)

L-A0670VANE CLUSTERS OF THE LOW PRESSURE TURBINE (LPT)
A-A
Low Pressure Turbine (LPT)
Figure 3 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
COOLING MANIFOLDS FOR THE LPT CASE 
A-A LPT COOLING 
LEGEND 
FAN DISCHARGE AIR MODULATED 12TH-STAGE AIR METERED 9TH-STAGE AIR 4TH-STAGE AIR 
L-A0671 
Figure 3 (Sheet 2) Low Pressure Turbine (LPT)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
NO. 4 BEARING COMPARTMENT OF THE LOW PRESSURE TURBINE (LPT)
SEE B
A
SEE A
A
L-A0342  ATTACHMENT POINTS 
(REAR) FOR THE 
GROUND HANDLING 
FRONT VIEW 
A 
NO. 4 BEARING 
NO. 4 BEARING 
COMPARTMENT 
STRUT OF 
THE TURBINE 
EXHAUST CASE 
MOUNTING FLANGE 
FOR THE 
EXHAUST PLUG 
REAR VIEW 
B 
STRUT OF 
THE TURBINE 
EXHAUST CASE
MOUNTING FLANGE 
FOR THE 
RAILS OF THE TURBINE  EXHAUST SLEEVE 
EXHAUST CASE 
A-A  L-A0343 
Turbine Exhaust Case 
Figure 4 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
B.  The turbine exhaust case, which serves as the transition duct for the exhaust gas flow from divergent (through the turbine) to convergent (through the exhaust nozzle), is constructed of greek ascoloy stainless steel material. The case is welded together as a concentric inner core segment and outer duct ring joined by 15 airfoil shaped radial struts. Two circumferential rails on the outer diameter of the case provide structural stiffness to the outer duct.
 C.  Provisions are made in the rear mount rails for the attachment of the engine mount links on the aft lower side to carry engine vertical, side, and torsional loads to the airframe structure. For additional information on the aft lower engine mount, refer to 71-21-00/001. The ground handling provisions on the rear of the engine consists of two holes through the rear mount rail on the horizontal centerline.
　
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