77-31-00
ALL ú ú C03 Page 12 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c) A DATA button on the front panel of the AVM signal conditioner permits the flight history to be shown. 1) Push the DATA button to put the unit in the "History" mode
to show the flight history data. Code FF will be shown.
2) The flight history will give data for each flight, up to a maximum of 32 flights.
3) The data will include the fan vibration, the high pressure compressor vibration, the low pressure turbine vibration, the high pressure turbine vibration and the time of maximum vibration from the start of the flight for each engine.
4) Flight 0 is the last flight flown and the first flight in the storage memory. Flight 31 is the oldest flight. A new flight begins and the last flight ends when one or both engines rise through 45% N2.
5) If history data for a flight before the last flight is necessary, unit can be put in "Fast Forward" mode by holding the DATA button for 4 seconds. Display will go from flight to flight and stop at each Flight No. for one second. Release the DATA button at the Flight No. will put the unit back into "History" mode and data for that flight can be read.
6) The procedure to read the fault history and the flight history is given in the maintenance practices (AMM 77-31-00/201).
(9) AIRPLANES WITH A S360N021-100 OR -102 AVM; The steps below are for the general interrogation of the AVM signal conditioner:
(a) An ARINC 429 reader must be used to read the fault history and the flight history. 1) The fault codes are given for unit failure, and signal loss
from the N1 or N2 speed sensor. The procedure to do a self test of the AVM signal conditioner is given in the adjustment/test (AMM 77-31-00/501).
2) The flight history will give data for each flight, up to a maximum of 32 flights.
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77-31-00
ALL ú ú C03 Page 13 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
3) Flight 0 is the last flight flown and the first flight in the storage memory. A flight begins and the last flight ends when one or two engines rise through 45% N2.
4) The data will include the fan vibration, the high pressure compressor vibration, the low pressure turbine vibration, the high pressure turbine vibration and the time of maximum vibration from the start of the flight for each engine.
(b) The procedure to read the fault history and the flight history is given in the maintenance practices (AMM 77-31-00/201).
(10) AIRPLANES WITH A S360N021-201 OR -202 AVM; The steps below are for the general interrogation of the AVM signal conditioner:
(a)
A TEST button on the front panel of the AVM signal conditioner permits a self test of the AVM signal conditioner. Only the AVM signal conditioner is tested. The procedure to do a self test of the AVM signal conditioner is given in the adjustment/test (AMM 77-31-00/501). 1) The self test is also automatically done when electrical
power is supplied to the system.
(b)
A DATA button on the front panel of the AVM signal conditioner permits the fault history and the flight history to be shown. 1) The fault history is shown first and the flight history is
shown last.
2) A fault code will be shown when the DATA button is pushed.
3) This fault code will be shown until the DATA button is
pushed again.
4) The next fault code is shown and the old fault code will not be erased until the last fault code is shown and the DATA button is pushed again.
5) When the code FF is shown, all fault codes have been erased and the flight history will start.
6) The fault codes will be shown for the signal loss from the accelerometers, high noise from the accelerometers, and signal loss from the N1 and N2 speed sensors.
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