R **ON A/C 051-099, 106-149, 204-299, 301-399, 401-499,

 ----------------------------------------------------------------------------| BIT | SIGNAL | "1" CONDITION | |-----|--------------------|-----------------------------------------------| | 1 | 1 -| | | 2 | 0 | | | | 3 | 1 | | | | 4 | 1 | LABEL 270 | | | 5 | 1 | | | | 6 | 0 | | | | 7 | 0 | | | | 8 | 0 -| | | 9 | SDI - LSB | | | 10 | SDI - MSB | | | 11 | Alignment Not Ready| In Align Submode | | 12 | Rev Att Mode | In Attitude Mode | | 13 | Nav Mode | In Nav Mode | | 14 | Valid Set Heading | A valid set heading has to be input to the | | | | IR. Magnetic heading outputs are no longer | | | | being computed, but have the characteristics | | | | of a "Free Direction Gyro". | | 15 | Attitude Invalid | Attitude Critical Fault | | 16 | DC Fail | DC Power Less Than 18V | | 17 | On DC | On DC Power | | 18 | ADR Fault | The IR has detected an ADR input (TAS, ALT | | | | and ALT RATE) as FW or NCD. Note functional | | | | test data is ignored by the IR and last valid | | | | input is used. | | 19 | IR Failure | Navigation (Non Critical) Fault | | 20 | DC Fail - On DC | The IR has detected that a DC fail occurred | | | | while on DC from last turn on. | | 21 | Align Fault | The IR has detected a position miscompare | | | | or a Quality of Align fault. | | 22 | No IR Initial | IR does not have position data or data | | | | received is invalid. | | 23 | Excess Motion Error| X or Y velocity greater than 0.011 ft/s | | | | during align. | | 24 | ADR/IR Fault | No data has been received from the ADR or | | | | was received with a parity error. | | 25 | Extreme Latitude | Latitude exceeds 73.N (+/-0.5. hysteresis) | | | | while Longitude is between 120.W and 90.W | | | | (+/-2.5. hysteresis) or Latitude exceeds | | | | 82.N (+/-0.5. hysteresis) or Latitude | | | | exceeds 60.S (+/-0.5. hysteresis). | | | | Magnetic Deviation is set to zero. |
R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 55 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1 ----------------------------------------------------------------------------| BIT | SIGNAL | "1" CONDITION | |-----|--------------------|-----------------------------------------------| | 26 | Align Time Status | Bits 28 27 26 Time Until Nav | |  27 | | 1  1  1 7 - 10 minutes | |  28 | | 1  1  0 6 minutes | | | | 1  0  1 5 minutes | | | | 1  0  0 4 minutes | | | | 0  1  1 3 minutes | | | | 0  1  0 2 minutes | | | | 0  0  1 1 minute | | | | 0  0  0 IN NAV MODE ONLY | | 29 | COMPUT LAT MISCOMP | SIN/COS OF LATITUDE TEST FAILED | | 30 | SSM | | | 31 | SSM | | | 32 | Parity | | ----------------------------------------------------------------------------

Digital Word 270 (IR Discretes)
 (Ref. Fig. 005, 006, 007)
R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 56 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1

 Digital Word 275 IR Discrete 2
 Figure 005

R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 57 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1

 Digital Word 276 IR Discrete 3
 Figure 006

R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 58 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1

 Digital Word 351 IR Maintenance
 Figure 007

R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 59 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1 The data field of the test word 277 (21 bits) alternates between the four first patterns shown in the following table below, except during the REALIGN DECISION submode and the POWER OFF submode. During these submodes the data field shall be as shown in pattern 5.

 ----------------------------------------------------------------------------| BIT | DEFINITION | |--------------------------------------------------------------------------| | 1 | 1 -| | 2 | 0 | | | 3 | 1 | | | 4 | 1 | LABEL 277 | | 5 | 1 | | | 6 | 1 | | | 7 | 1 | | | 8 | 1 -| |--------------------------------------------------------------------------| | 9 | SDI | | 10 | SDI | |---------|----------------------------------------------------------------| | |PATTERN 1 |PATTERN 2|PATTERN 3|PATTERN 4| PATTERN 5 | |---------|----------|---------|---------|---------|-----------------------| | 11 | 0 | 0 | 1 | 1 | BCD MODE TIMER | | 12 | 1 | 1 | 0 | 0 | (LSD) | | 13 | 0 | 1 | 1 | 0 | (REALIGN AND | | 14 | 1 | 1 | 0 | 0 | POWER OFF) | |---------|----------|---------|---------|---------------------------------| | 15 | 0 | 0 | 1 | 1 | BCD MODE TIMER | | 16 | 1 | 1 | 0 | 0 | (MSD) | | 17 | 0 | 1 | 1 | 0 | (REALIGN AND | | 18 | 1 | 1 | 0 | 0 | POWER OFF) | |---------|----------|---------|---------|---------------------------------| | | | | | | MODE FLAG: | | 19 | 0 | 0 | 1 | 1 | 00 = PWR OFF SUBMODE | | 20 | 1 | 1 | 0 | 0 | 11 = REALIGN DECISION | | | | | | | SUBMODE | |---------|----------|---------|---------|---------|-----------------------| | 21 | 0 | 1 | 1 | 0 | 0 | | 22 | 1 | 1 | 0 | 0 | 0 | | 23 | 0 | 0 | 1 | 1 | 0 | | 24 | 1 | 1 | 0 | 0 | 0 | | 25 | 0 | 1 | 1 | 0 | 0 | | 26 | 1 | 1 | 0 | 0 | 0 | | 27 | 0 | 0 | 1 | 1 | 0 | | 28 | 1 | 1 | 0 | 0 | 0 | | 29 | 0 | 1 | 1 | 0 | 0 | | 30 | 0 | 0 | 1 | 0 | 0 |
　
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