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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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////////////////////////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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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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