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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-230
General
You push the YES BITE switch at the SHOW IM-BALANCE
DATA? display to see the data that the AVM signal conditioner
uses for balance solution calculations. An option to see engine
1 data shows first. Push the YES BITE switch to see data for
engine 1. Push the NO BITE switch to go to engine 2 data. The
NO IM-BAL DATA message will show if the AVM signal
conditioner does not have data for the selected engine.
You can see vibration data for the last flight (cycle or leg) of
each engine. The AVM makes a record of fan and low pressure
turbine (LPT) vibrations during engine operation in six different
N1 speed ranges. These are the N1 speed ranges for which the
signal conditioner saves data:
* 62.5 % to 67.4 % (Range 1)
* 67.5 % to 72.5 % (Range 2)
* 77.5 % to 82.4 % (Range 3)
* 82.5 % to 87.4 % (Range 4)
* 87.5 % to 92.4 % (Range 5)
* 92.5 % to 97.5 % (Range 6).
This fan data shows for each speed range:
* Speed range number (1-6)
* N1 speed (YY.Y) at which data was recorded
* Fan vibration (ZZ.Z) in mils, double amplitude (not same as
units vibration shows on CDS)
* Phase angle (TTT) of fan imbalance in degrees.
This LPT data shows for each speed range:
* Speed range number (1-6)
* N1 speed (YY.Y) at which data was recorded
* LPT vibration (ZZ.Z) in mils, double amplitude
* Phase angle (TTT) of LPT imbalance in degrees.
The display shows 0% N1 for a speed range if the AVM does not
record vibration data for that speed range. This happens if the
engine does not operate in the speed range for more than 5
seconds.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - ENGINE BALANCE PG 2 - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 114 77-31-00
Page 78
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-232
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - ENGINE BALANCE PG 2 - TRAINING INFORMATION POINT
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - ENGINE BALANCE PG 2 - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 114 77-31-00
Page 79
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-232
General
You go into the EDIT ENG BALANCE PARTS menu to review or
modify the fan balance weight data in the AVM signal
conditioner non-volatile memory. The nonvolatile memory
does not save LPT clip information.
The nonvolatile memory contains the classification of the fan
balance weight (PO1 through PO7) at each balance weight
location (fan hole). The AVM signal conditioner may use this
information for balance solutions. See the ENGINE BALANCE
PG 4 page in this section for more information.
You push the YES BITE switch at the EDIT ENG BALANCE
PARTS? display to enter the menu. An option to go to engine 1
data shows first. Push the YES BITE switch to go to engine 1
data. Push the NO BITE switch to go to engine 2 data.
The NO FAN PARTS message shows if the AVM signal
conditioner does not have data for the selected engine. After
a three-second time delay, you have the option to add balance
weight (part) data. You use the up and down arrow BITE
switches to change the weight classification and fan hole
number.
You can view or edit balance weight data for each engine. Each
balance weight has these items that show on the AVM display:
* Part number
* Weight classification (PO1 through P07 will show instead of
XXX)
* Fan hole number (actual number will show instead of XX).
Fan hole number 1 is next to fan blade number 1. The fan hole
numbers increase in a counter clockwise direction (looking aft).
To view part data, push the YES BITE switch at the VIEW E1(2)
FAN PARTS? display. Data for part 1 shows first. Use the up and
down arrow BITE switches to navigate through all parts. Push
the NO BITE switch at any point to return to the start of the view
menu.
To edit part data, push the NO BITE switch at the VIEW E1(2)
FAN PARTS? display. Push YES to go to part 1. You use the up
and down arrow BITE switches to change the weight
classification of part 1. Push YES to save the new weight
classification. Push YES again to move to part 2.
You may also add new part data if it does not exist in the AVM
signal conditioner non-volatile memory. You get to this part of
the menu when you push the NO BITE switch from the EDIT
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