NOTE: In all cases of fan blade replacement, a vibration survey can be
____ performed. The results from the vibration survey will determine if a trim balance is necessary.
NOTE: The digit numbers (1) through (100) on the upper front face on the
____ platform are the moment weight class code. The difference between two adjacent moment weight class codes is 50 gram-inches.
NOTE: The 5 digit number engraved on the lower face of the blade root
____ close to the part identification numbers (part number and serial number) is the fan rotor blade moment weight value. This value (example: 31628) is expressed in gram-inches.
S 844-009-C00
(1) Do the procedure to prepare for the replacement of the fan blades.
S 024-028-C00
WARNING:_______MAKE SURE YOU WEAR GLOVES WHEN YOU HANDLE THE FAN BLADES. THE FAN BLADES CAN CAUSE INJURY TO YOUR HANDS.
CAUTION: IF YOU ARE TO INSTALL THE FAN ROTOR BLADES AGAIN, YOU MUST MAKE
_______ A RECORD OF THEIR INITIAL POSITIONS. YOU CAN ONLY USE APPROVED MARKING MATERIALS (AMM 70-10-03/201).
(2) Remove the fan blade.
(a) Use your hand to turn the fan until the fan blade to be removed is in the 12 o'clock position.
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72-31-02
ALL ú ú C02 Page 421 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b)
Remove the spinner front and rear cones (AMM 72-31-01/401).
(c)
Move the spacer forward until you can release the retainer.
NOTE: If it is necessary, use a puller adapter, slide hammer,
____
and rod.
(d)
Lift the blade retainer out of the fan disk.
(e)
Lower the blade toward the disk center to disengage the mid-span shroud.
(f)
To remove the blade, move the blade forward out of the dovetail slot.
(g)
ENGINES WITH A REBROACHED FAN DISK; (ENGINES POST-CFMI-SB 72-621 AND POST-CFMI-SB 72-820); Remove the shim from the root of the fan blade.
(h)
ENGINES WITH DAMPERS; (ENGINES POST-CFMI-SB 72-494 AND POST-CFMI-SB 72-543); Remove the dampers.
(i)
If it is necessary, move the adjacent blade forward as follows: 1) Pull the spacer from the adjacent blade forward.
NOTE: If it is necessary, use a puller adapter, slide
____
hammer, and a rod.
2) Remove the retainer.
3) Lower the blade to disengage the mid-span shroud.
4) Move the blade forward in the dovetail slot until you can
release the blade.
S 424-009-C00
(3) Install the fan blade as follows:
CAUTION: DO NOT INSTALL FAN BLADES WITH 25 DEGREE AND 37 DEGREE
_______ MID-SPAN SHROUDS ON THE SAME ENGINE. FAN BLADES WITH 37 DEGREE MID-SPAN SHROUDS (CFMI SB 72-494 OR CFMI SB 72-543) HAVE THE LETTER "N" ON THE BLADE PLATFORM IMMEDIATELY BEFORE THE MOMENT WEIGHT CLASSIFICATION. ENGINE FAILURE CAN OCCUR.
(a)
Get a spare fan blade with the correct mid-span shroud.
(b)
Write the moment-weight of the blade you removed and the spare blade you are to install.
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