MINIMUM BLEND RADIUS
TRAILING EDGE
REWORK CONTOUR MUST
CONFORM TO ORIGINAL
CONTOUR AS SHOWN S-M56-MM-1120-(1)-00-C
DOTTED LINES INDICATE
ORIGINAL CONTOUR OF BLADE
1st-Stage Booster Vane Leading Edge Blending Limits
Figure 801
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c)
When blending an area that includes a radius, keep the radius as near as possible to original radius.
(d)
The finish on a blended area must be as near as possible to the initial finish.
(e)
Remove the material to a minimum of 0.01 inch (0.25 mm) below the damage, but do not exceed the maximum blend limit of 0.16 inch (4.0 mm) (Fig. 801). 1) Do a fluorescent-penetrant inspection to make sure the
damage is fully removed (AMM 70-40-01/201). 2) Repalce the blade or vane if you find a crack.
S 428-006-C00
(4)
Install the three fan blades (AMM 72-31-02/401).
S 868-007-C00
(5)
Remove the DO-NOT-CLOSE tag and close the applicable ENGINE START VALVE circuit breaker on the P6-2 panel.
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ALL ú ú C01 Page 803 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NO. 1 AND NO. 2 BEARING SUPPORT ASSEMBLY - DESCRIPTION AND OPERATION
____________________________________________________________________
1. General
_______
A. The No. 1 and No. 2 bearing support module is bolted to the fan frame front face and supports both the fan and booster rotor assemblies (Fig. 1).
B. The bearing support consists of the following major parts:
(1)
No. 1 bearing support
(2)
No. 1 ball bearing
(3)
No. 2 bearing support
(4)
No. 2 roller bearing
(5)
Oil manifold
(6)
External piping
(7)
Fan shaft
2. No. 1 Bearing Support
_____________________
A. The No. 1 bearing support is a titanium weldment. The rear outer flange of the support is bolted to the fan frame. The front flange of the support carries the No. 1 ball bearing housing. The rear inner flange carries the No. 2 bearing support. The outer casing is provided with a flange onto which is attached the No. 1 bearing stationary air/oil seal. The bottom rear of the casing has an orifice providing for oil drainage through the fan frame hub. The forward casing has holes for oil and air venting into the No. 1 bearing air/oil seal and subsequent tube transfer to the front sump.
3. No. 1 Ball Bearing
__________________
A. The No. 1 ball bearing is a thrust bearing which carries the axial loads generated by the low pressure rotor system. Its one-piece outer race is located in the bearing housing. Its inner race has two halves bolted to the No. 1 bearing sleeve which is installed on the fan shaft. The bearing sleeve is provided with an oil baffle upstream of the No. 1 bearing. The bearing sleeve has provisions for locking the No. 1 bearing, locating the oil baffle forward of the No. 1 bearing. The No. 1 bearing air/oil seal is integral with the sleeve.
4. No. 2 Bearing Support
_____________________
A. The No. 2 bearing support is a steel alloy assembly. Its front flange is bolted to the No. 1 bearing support. Its rear flange accommodates the No. 2 roller bearing outer race. Holes are provided in this support for internal pressure equalization purposes in the forward oil sump. It also has an integral sleeve at the 4 o'clock position, providing for N1 speed sensor installation. There are holes at the 9 o'clock position for oil supply to the oil manifold and for installing the No. 2 bearing oil nozzle.
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