NOTE: If NO IMBAL DATA shows, there is no stored balance data
____ in the AVM. The fan trim balance cannot be performed until after a flight or ground trim run is performed.
(b)
If you push and release the NO button, the BALANCE 1 PLANE COMPUTE? screen will show.
(c)
Push and release the YES button. This causes the FLIGHT X? screen to show.
NOTE: The X refers to the flight number, and can be 0 through
____ 5, where 0 is the last flight. Use the UP and DOWN ARROW buttons to make a selection of the flight that you want to see the imbalance history on.
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(d) Push and release the YES button. The screen that shows gives the highest imbalance data for the selected flight that was recorded (Table 505).
NOTE: The definitions of the screen are given below.
____
NOTE: There are six separate imbalance data screens for each
____
flight.
NOTE: Use the UP and DOWN ARROW buttons to get each of the
____
five other imbalance data screens that were recorded
during each flight.
NOTE: If no data was recorded for a particular screen then the
____
screen will appear as:
E1 --.-%
-.--/----:--/---
Use the UP and DOWN ARROW buttons to view the next imbalance data screen.
NOTE: Each data screen contains vibration information at a
____ different engine N1 speed. Typically, the six screens show vibration information for 108.1-102.1% N1, 102.0-99.1% N1, 99.0-97.1% N1, 97.0-96.0% N1, 95.9-93.0% N1, and 92.9-89.9% N1.
~..................................
| AVM FRONT PANEL DISPLAY |
| TABLE 505 |
....................................
| E 1 x x . x % |
| |
| n . n n / y y y |
| |
| m . m m / z z z |
| |
2..................................1
1) xxx - N1 rotor speed in percent
2) nnn - the fan displacement in mils
3) mmm - the LPT displacement in mils
4) yyy - the phase angle for the fan in degrees
5) zzz - the phase angle for the LPT in degrees
(e) From the IMBAL DATA READ? screen, push and release the NO button. This causes the BALANCE 1 PLANE COMPUTE? screen to show.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 945-114-N00
(3) To go into the BALANCE 1 PLANE COMPUTE? menu to calculate a 1-plane (fan) balance solution, follow these steps:
NOTE: This menu will do a 1-plane trim balance calculation.
____
(a)
Push and release the YES button to do a 1-plane (Fan) balance solution. ~.................................. | AVM FRONT PANEL DISPLAY | | TABLE 506 | .................................... | C O M P U T E | | | | I N | | | | P R O G R E S S | | | 2..................................1
(b)
After the computation is completed the Display Panel will read: NO BALANCE DATA or X FLIGHTS DISPLAY?. 1) If the display reads NO BALANCE DATA press and release the
NO button to go to the Engine 2 balance menu.
(c)
Press and release the YES button to get the balance solution.
(d)
The screen that shows gives the balance data for the selected flight (Table 507).
NOTE: The definitions of the screen are given below.
____
NOTE: Use the UP and DOWN ARROW buttons to get to each of
____ the five other recorded balance data screens.
~..................................
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