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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 chose from to use in balance
function. The maximum number of flights to chose from is 6. 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. Push the
YES 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 shows to tell you
that the calculations are done. There are 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 fan solution. The balance screws that you should
remove and install at specific locations show. The LPT balance
data follows the fan balance data. For the LPT, the necessary
screws to add and their locations show.
Push YES to save the new data in AVM memory if you plan to
follow the solution and remove and install appropriate balance
screws. This makes sure that the fan balance weight data
(weight classification and location) in AVM non-volatile memory
agrees with the actual engine. The AVM does not save LPT
weight data.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - BALANCE PG 5 - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 77-31-00
Page 62
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-31-00-140
GUN 111-113 (Continued)
GUN 001-099, 101-110, 115, 201-999
General
Push the YES switch from the BALANCE 2 PLANE COMPUTE?
display to see the AVM signal conditioner supply a balance
solution for the engine fan and low pressure turbine (LPT).
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 chose 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. MMMM is LPT balance weight solution in
grams-centimeters. ZZZ is LPT 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 shows:
* SOLUTION FOUND DISPLAY?
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