(2)
Fan outlet guide vanes (OGV)
2. Fan Frame Module (Fig. 1)
________________
A. The fan frame is a fabricated structural weldment constructed of concentric rings connected by radial struts. It consists of the basic fan frame structure and the fan case.
B. The basic fan frame structure is made of steel alloy. It consists of a hub, mid box structure, and outer casing interconnected through four thick and four thin radial struts.
(1)
Structural strength for the fan frame is obtained from the eight struts. The struts are hollow to provide passage for the following equipment:
(a)
No. 1 bearing vibration sensor cable (No. 4 strut)
(b)
N1 speed sensor (No. 5 strut)
(c)
Transfer gearbox (TGB) radial drive shaft and engine forward sump oil scavenge tube (No. 10 strut)
(2)
The hub front face supports the No. 1 and No. 2 bearing support. The rear face supports, from front to rear, the IGB and No. 3 bearing module and the rear stationary air/oil seal together with its pressurization air supply ring. The hub outer surface, which is also the inner wall of the primary airflow annulus, has orifices for bleed air requirements.
(3)
The mid box structure is located radially half-way between the primary and secondary airflows. It houses the 11 variable bleed valve (VBV) ballscrew actuators and the VBV master ballscrew actuator. The front face of the structure supports the rear flanges of the 4th-stage booster vane assembly, and the fan OGV support aft fairing (or OGV assembly inner shroud). The structure rear face supports the HPC forward case and the VBV hydraulic fuel gear motor and provides for engine mounting.
(4)
The inner surface of the outer casing is the outer wall for the secondary air flow. Located on the outer surface of the casing are the front engine mounts, two ground handling mounts and the TGB mounting pad. The fan inlet case mounts to the outer casing front flange, and the fan discharge duct mounts to the outer casing rear face.
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72-33-00
ALL ú ú C01 Page 1 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NO. 3 BEARING REAR STATIONARY AIR/OIL SEAL
INLET GEARBOX (IGB)
S-M56-MM-0908-(1)-01-B
Fan Frame Location Figure 1
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72-33-00
ALL ú ú C01 Page 2 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OUTER
CASTING
NO. 1 BEARING VIBRATION SENSOR CABLE
PRIMARY
AIRFLOW
N1 SPEED
A-A
S-M56-MM-0909-(1)-01-B
Fan Frame Struts Location Figure 2
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ALL ú ú C01 Page 3 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
C. The fan inlet case is a fabricated structural weldment made of steel alloy. The case is bolted to the fan frame outer front flange. The case outer surface has flanges and ribs to provide additional strength to the case during engine operation. It also has two hoisting points for engine ground handling purposes (2 and 10 o'oclock positions), four accessory gearbox (AGB) mounts and various other mounting provisions for engine equipment. The inner surface is lined with 12 fan forward acoustical panels, one abradable shroud located radially in line with the fan rotor blades, 12 fan mid acoustical panels, the fan OGV, and 12 aft acoustical panels. The engine air inlet cowl is attached to the front flange of the fan case.
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