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with vibration data that you may choose from to use in the
balance function. The maximum number of flights to choose
from is 6. Remember, you can look at the data of each individual
flight in the IMBAL DATA READ? menu. See BALANCE PG 2 for
more information.
Push the YES switch from the X FLIGHTS DISPLAY? message to
go to the next display. This display shows information for flight
zero (the last flight) in history. NNNN is the module vector of the
fan in gram-centimeters. YYY is the phase of the fan vibration
vector in degrees. MMMM is the module of the LPT vector in
gram-centimeters. ZZZ is the phase of the LPT vibration vector
in degrees. F0 tells you that this data is for flight zero. You push
the down arrow switch to go to flight 1 data. You must select one
flight (set of data) for the AVM signal conditioner to use in its
calculation of the balance solution. Push the YES switch to
select that flight. The BALANCE IN PROGRESS message shows
during the balance calculations.
The SOLUTION FOUND DISPLAY? message tells you that the
calculations are done. Three other messages are also possible.
These are the messages that can show:
* NO CHANGE REQUIRED
* WEIGHT LIMIT EXCEEDED
* NO IMBAL DATA ACQUIRED.
Push YES from the SOLUTION FOUND DISPLAY? message to
see the solutions. The balance screws you should remove and
install shows for locations that require a change.
Push YES to save the new data in AVM memory only if you plan
to follow the solution and remove and install appropriate
balance screws. This makes sure that the balance weight data
(weight classification and location) in AVM non-volatile memory
agrees with the actual engine.
Training Information Point
Although the 2 plane balance is a function of the AVM signal
conditioner, it is not an approved maintenance procedure for
the CFM56-7 engine. Refer to AMMII 71-00-00.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - BALANCE PG 4 - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 77-31-00
Page 56
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-31-00-137
GUN 111-113 (Continued)
GUN 001-099, 101-110, 115, 201-999
General
Push the YES switch, from the BALANCE 1 PLANE COMPUTE?
display to see the AVM signal conditioner supply a balance
solution for the engine fan. There are two types of coefficient
sets (multipliers), generic and specific. The generic coefficients
are used by the AVM to calculate a balance solution. Specific
coefficients are installed by the AVM manufacturer when
necessary.
The first message that shows is XXXXXXXX GENERIC COEFFS.
?. Where X is the eight-character coefficient set identification
number shows.
If no coefficients are recognized by the AVM, the identification
number shows as "---------".
When you push the NO switch from the generic coefficients
menu, the XXXXXXXX SPECIFIC COEFFS. ? message shows.
Where X is the eight-character coefficient set identification
number shows. You can reset the specific coefficients when
they are no longer needed.
The COMPUTE IN PROGRESS MESSAGE shows when you
push the YES switch from the XXXXXXXX GENERIC COEFFS.
display. The X FLIGHTS DISPLAY ? message shows if the AVM
has flight history vibration data in memory. X is the total number
of flights with vibration data that you may choose from to use in
the balance function. The maximum number of flights to choose
from is 6. The NO BALANCE DATA message shows if there is
no vibration data stored.
Push the YES switch from the X FLIGHTS DISPLAY? message to
go to the next display. This display shows information for flight
zero (the last flight) in history. NNNN is fan balance weight
solution in gram-centimeters. YYY is fan balance weight
position in degrees. X/6 is the number of speed ranges with
valid data (0 to 6). FX is the flight number (0 to 5). Push the down
arrow switch to go to flight 1 data. You must select one flight (set
of data) for the AVM signal conditioner to use in its calculation of
the balance solution. Push the YES switch to select that flight.
The BALANCE IN PROGRESS message shows during the
balance calculations.
When the AVM balance calculation is complete, one of these
messages show:
* SOLUTION FOUND DISPLAY?
* NO BAL. DATA ACQUIRED
* WEIGHT LIMIT EXCEEDED
* NO SOLUTION FOUND
* NO CHANGE REQUIRED.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - BALANCE PG 4 - TRAINING INFORMATION POINT
EFFECTIVITY
　
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