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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~............................................................................... | LABEL 301 FAULT HISTORY BIT TABLE | ................................................................................. | ARINC 429 BITS | DEFINITION | | ..................................................................... | | 1 1 0 1 1 | 27 | | ..................................................................... | | 1 1 1 0 0 | 28 | | ..................................................................... | | 1 1 1 0 1 | 29 | | ..................................................................... | | 1 1 1 1 0 | 30 | | ..................................................................... | | 1 1 1 1 1 | FAULT 31 | ................................................................................. |BITS 16-24 | | NOT USED | ................................................................................. |BITS 25-29 | 29 28 27 26 25 | FAULT CODE DESCRIPTION | ................................................................................. | | 0 0 0 0 0 | NOT USED | | ..................................................................... | | 0 0 0 0 1 | UNIT FAILURE | | ..................................................................... | | 0 0 0 1 0 | N1 TACHOMETER SIGNAL LOSS | | ..................................................................... | | 0 0 0 1 1 | N2 TACHOMETER SIGNAL LOSS | | ..................................................................... | | 0 0 1 0 0 | NOT USED | | ..................................................................... | | ± ± ± ± | ± | | ..................................................................... | | 0 1 0 1 0 | NOT USED | ............….................................................................... |BITS 30-31 | SIGN STATUS MATRIX (ALWAYS SET TO ZERO) | ................................................................................. |BIT 32 | PARITY BIT (THIS BIT ADDED TO BITS 1-31 | | | SO THE SUM IS ALWAYS ODD) | 2...................................…...........................................1
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ALL ú ú C04A Page 209 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~............................................................................... | CONVERSION TABLE FROM HEXIDECIMAL TO BINARY | ................................................................................. | HEXIDECIMAL | BINARY | HEXIDECIMAL | BINARY | ................................................................................. | 0 | 0 0 0 0 | 8 | 1 0 0 0 | ................................................................................. | 1 | 0 0 0 1 | 9 | 1 0 0 1 | ................................................................................. | 2 | 0 0 1 0 | A | 1 0 1 0 | ................................................................................. | 3 | 0 0 1 1 | B | 1 0 1 1 | ................................................................................. | 4 | 0 1 0 0 | C | 1 1 0 0 | ................................................................................. | 5 | 0 1 0 1 | D | 1 1 0 1 | ................................................................................. | 6 | 0 1 1 0 | E | 1 1 1 0 | ................................................................................. | 7 | 0 1 1 1 | F | 1 1 1 1 | 2.....................…................…....................…...................1
~.............................................................................. | Example: Change the Hexidecimal 830041 to Binary | ................................................................................ | 8 | 3 | 0 | 0 | 4 | 1 | ................................................................................ |1 0 0 0 | 0 0 1 1 | 0 0 0 0 | 0 0 0 0 | 0 1 0 0 | 0 0 0 1 | ............….........................…............…............…............... |32|31 30|29 28 27 26 25 | 24 23 22 21 20 19 18 17 16 |15 14 13 12 11 | 10 9 | ................................................................................ |PB| SSM | FAULT CODE | NOT USED | FAULT SEQUENCE| ENG | ...….....…...............….............................…...............…........ | BITS 32 THROUGH 9 | ................................................................................ | Engine - Bit 9 set to one, Bit 10 to zero, identifies Engine 1. | | Fault Sequence - Bit 15 set to one, Bits 14-11 set to zero, identifies the | | the data as FAULT 16 or Fifteenth to the last fault. | | Fault Code - Bits 25-26 set to one, Bits 27-29 set to zero, identifies the | | data as N2 TACHOMETER SIGNAL LOSS. | 2..............................................................................1
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