2.............................................1
6) XX - the hole number (1 to 8)
7) POX - the actual weight that must be removed
8) POY - the new weight that must be installed.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(f)
Record each new balance screw and its location on the fan spinner.
(g)
After you use the DOWN ARROW button to show the last hole (number 38), push and release the DOWN ARROW once and the DISPLAY SOLUTION AGAIN? screen will show. To see the solution again, push and release the YES button.
(h)
Push and release the NO button. This causes the SAVE NEW CONFIG? screen to show.
(i)
Push and release the YES button to keep the new balance weight solution.
NOTE: After the YES button is pushed, the balance history
____
in the AVM is erased.
1) If you do not want to keep the new balance weight solution, push and release the NO button.
(j)
After the YES or NO button was pushed, the BAL FOR ENGINE 2? screen will show (if the engine 1 was on) or the display will go off (if the engine 2 was on).
(k)
Install the new balance screws as follows (Fig. 502):
CAUTION: MAKE SURE THAT YOU PUT A MAT ON THE LOWER SURFACE OF
_______ THE INTLET COWL. DAMAGE TO THE INLET COWL SURFACES CAN OCCUR.
1) Put the mat on the inner lower half of the inlet cowl.
2) Find the number one fan blade. This blade is immediately above the offset hole (machined dimple) on the fan disk bolt flange. a) Use a marking pen, (C05-003) to put a mark on this
blade to identify it as the number one blade. 3) At the first hole where you will install a new balance screw, remove the installed balance screw.
4) Lubricate the new balance screw with grease, GP460, Aeroshell 8 and install on the spinner. a) Tighten the screw to 110-120 pound-inches (12.4-13.5
Newton meters). 5) Repeat the above steps to install all other balance screws. 6) Remove the mat and all the other unwanted material from the
inlet cowl.
(l) Do the trim balance test at the end of this procedure.
S 975-156-C00
(5) To go into the BALANCE 2 PLANE COMPUTE? menu to calculate a 2-plane (fan and LPT) balance solution, follow these steps:
(a) From the IMBAL DATA READ? screen, push and release the NO button three times. This causes the BALANCE 2 PLANES COMPUTE? screen to show.
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ALL ú ú C10 Page 582J ú Mar 12/02
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b) Push and release the YES button. This causes the X FLIGHTS DISPLAY? screen to show.
NOTE: The X refers to the total number of flights or trim
____
balance runs in memory, and is 1 through 6.
NOTE: If no IMBAL DATA shows, there is no stored balance
____ data in the AVM. If you push and release the NO button after the NO IMBAL DATA or X FLIGHTS DISPLAY? screens, the BAL FOR ENGINE 2? screen will show (if the engine 1 menu was on) or the display will go off (if the engine 2 menu was on).
(c) Push and release the YES button. This causes the screen to show (Table 506).
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