(2)
The No. 1 and 2 bearing carbon seals are pressurized by station 2.5 LPC bleed air.
(3)
The No. 1.5 bearing carbon seals are pressurized by 9th-stage HPC bleed air.
C.
No. 3 Bearing Compartment
(1)
The No. 3 bearing carbon seals are spring-loaded, wet face seals.
(2)
The No. 3 bearing carbon seals are pressurized by 12th-stage HPC bleed air that has passed through an air/air heat exchanger (No. 3 bearing buffer air cooler) located at the 2:30 o'clock position in the intermediate case.
D.
No. 4 Bearing Compartment
(1)
The No. 4 bearing carbon seal is a dry face, ring seal.
(2)
The No. 4 bearing carbon seal is pressurized by station 2.5 LPC air that enters the LPT shaft forward of the No. 1 bearing.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-00-00
ALL ú ú N01 Page 39 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////
A / PW4000 SERIES /
747-400 / ENGINES /FAULT ISOLATION/MAINT MANUAL ////////////////////////
ENGINE
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE
BLADES - 1ST-STAGE (FAN), ENG 1 1 38 LPC HUB 72-31-02
BLADES - 1ST-STAGE (FAN), ENG 2 1 38 LPC HUB 72-31-02
BLADES - 1ST-STAGE (FAN), ENG 3 1 38 LPC HUB 72-31-02
BLADES - 1ST-STAGE (FAN), ENG 4 1 38 LPC HUB 72-31-02
CASE - FRONT FAN, ENG 1 3 1 413,414, FAN COWL PANELS 72-33-01
CASE - FRONT FAN, ENG 2 3 1 423,424, FAN COWL PANELS 72-33-01
CASE - FRONT FAN, ENG 3 3 1 433,434, FAN COWL PANELS 72-33-01
CASE - FRONT FAN, ENG 4 3 1 443,444, FAN COWL PANELS 72-33-01
CONE - INLET, ENG 1 2 1 LPC HUB 72-31-01
CONE - INLET, ENG 2 2 1 LPC HUB 72-31-01
CONE - INLET, ENG 3 2 1 LPC HUB 72-31-01
CONE - INLET, ENG 4 2 1 LPC HUB 72-31-01
COUPLING - STARTER DRIVE, ENG 1 6,8 1 415,416, THRUST REVERSER HALVES, MAIN GEARBOX, AFT FACE 72-61-09
COUPLING - STARTER DRIVE, ENG 2 6,8 1 425,426, THRUST REVERSER HALVES, MAIN GEARBOX, AFT FACE 72-61-09
COUPLING - STARTER DRIVE, ENG 3 6,8 1 435,436, THRUST REVERSER HALVES, MAIN GEARBOX, AFT FACE 72-61-09
COUPLING - STARTER DRIVE, ENG 4 6,8 1 MAIN GEARBOX, AFT FACE 445,446, THRUST REVERSER HALVES, 72-61-09
COVER - NO. 4 BEARING COMPARTMENT, ENG 1 9 1 419, TURBINE EXHAUST SLEEVE, TURBINE EXHAUST CASE, AFT FACE 72-54-05
COVER - NO. 4 BEARING COMPARTMENT, ENG 2 9 1 TURBINE EXHAUST CASE, AFT FACE 429, TURBINE EXHAUST SLEEVE, 72-54-05
COVER - NO. 4 BEARING COMPARTMENT, ENG 3 9 1 TURBINE EXHAUST CASE, AFT FACE439, TURBINE EXHAUST SLEEVE, 72-54-05
COVER - NO. 4 BEARING COMPARTMENT, ENG 4 9 1 449, TURBINE EXHAUST SLEEVE, TURBINE EXHAUST CASE, AFT FACE 72-54-05
FAIRING - FAN EXIT, ENG 1 2 1 LPC 72-31-03
FAIRING - FAN EXIT, ENG 2 2 1 LPC 72-31-03
FAIRING - FAN EXIT, ENG 3 2 1 LPC 72-31-03
FAIRING - FAN EXIT, ENG 4 2 1 LPC 72-31-03
GEARBOX - ANGLE, ENG 1 5 1 415,416, THRUST REVERSER HALVES, INTERMEDIATE CASE 72-62-01
GEARBOX - ANGLE, ENG 2 5 1 425,426, THRUST REVERSER HALVES, INTERMEDIATE CASE 72-62-01
GEARBOX - ANGLE, ENG 3 5 1 435,436, THRUST REVERSER HALVES, INTERMEDIATE CASE 72-62-01
GEARBOX - ANGLE, ENG 4 5 1 445,446, THRUST REVERSER HALVES, INTERMEDIATE CASE 72-62-01
HOUSING - MAIN OIL FILTER, ENG 1 5 1 MAIN GEARBOX, FWD FACE415,416, THRUST REVERSER HALVES, 72-61-11
HOUSING - MAIN OIL FILTER, ENG 2 5 1 MAIN GEARBOX, FWD FACE425,426, THRUST REVERSER HALVES, 72-61-11
HOUSING - MAIN OIL FILTER, ENG 3 5 1 MAIN GEARBOX, FWD FACE435,436, THRUST REVERSER HALVES, 72-61-11
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