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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~............................................................ | FAULT CODE | .............................................................. | CODE | DESCRIPTION | .............................................................. | B4 |N2 speed sensor signal loss - | | |Engine 2 | 2.............................…..............................1
1) Record this fault code before you get the subsequent fault code.
(c)
Push and release the BITE/ERASE button to show each of the remaining fault codes. 1) Record each fault code before you push the BITE/ERASE
button again.
(d)
Do one of the steps that follow to interrogate the AVM signal conditioner further: 1) If you do not want to continue, push the TEST button.
NOTE: The TEST button will start a self test and turns the
____
display off.
2) When the last fault code is displayed, push and release the BITE/ERASE button if you want to erase the last fault code in storage memory.
NOTE: You will have no indication of the total number of
____ fault codes before they are erased. After you erase the last fault code, the front display will be blank. This puts the AVM signal conditioner back to its standby mode.
a) If you do not want to continue, push the TEST button.
NOTE: The TEST button will start a self test and turns
____
the display off.
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CFM56 ENGINES
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(e)
If there are no fault codes in storage memory, then the front display will be blank.
(f)
If there are fault codes, do the troubleshooting that shows for an AVM Indication Problem (AMM 71-00-54/101).
F. Read the Flight History
S 972-023-C00
(1) Do these steps to read the flight history:
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~...................................................................... | FLIGHT HISTORY | ........................................................................ | What button on the AVM | Front display of AVM | Description of | | signal conditioner to | signal conditioner | front display | | push and release *[6] | | | ........................................................................ | DATA button | FF | Sequence Start | ........................................................................ | DATA button | 00 *[3] | Flight Number | ........................................................................ | DATA button | E1 | Engine 1 (E1) | ........................................................................ | DATA button | 00 - 50 *[1] | Fan Vibration - E1 | | | | *[5] | ........................................................................ | DATA button | 00 - 50 *[1] | HPC Vibration - E1 | | | | *[5] | ........................................................................ | DATA button | 00 - 50 *[1] | LPT Vibration - E1 | | | | *[5] | ........................................................................ | DATA button | 00 - 50 *[1] | HPT Vibration - E1 | | | | *[5] | ........................................................................ | DATA button | 00 - B9 *[2] | N1 Speed (%) - E1 | ........................................................................ | DATA button | 00 - B9 *[2] | N2 Speed (%) - E1 | ........................................................................
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