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 2. System Description__________________
 A. General The IR portion is a strapdown inertial system which provides a quality reference for attitude, heading (true and magnetic), angular rates and accelerations. The IR software also computes: - the inertial position - the ground velocities - the baro inertial vertical speed - the drift angle - the wind data - the flight path data.
 B. Inputs
 (1) Digital inputs
 (a) FMGC inputs The IR portion is provided with two ARINC 429 low speed buses from the two ARINC 702 Flight Management and Guidance Computers (FMGCs). These buses transmit the following data words: - label 041: SET LATITUDE - label 042: SET LONGITUDE - label 270: FMGC DISCRETES. These data words are used for initialization and BITE purposes.
 (b) CDU input The IR portion is provided with one ARINC 429 low speed bus from the CDU. This bus transmits the following data words: - label 041: SET LATITUDE - label 042: SET LONGITUDE - label 043: SET MAGNETIC HEADING - label 277: CDU TEST. These data words are used for initialization and BITE purpose.

 

 (c)
 ADR inputs The IR portion is provided with three ARINC 429 low speed buses from the other two ADIRUs (ADR portion) and from its associated ADR. These buses transmit the following data words:

 -
label 203: ALTITUDE

 -
label 210: TRUE AIRSPEED.

 

 (d)
 GPS inputs The IR portion is provided with two ARINC 429 high speed buses from the two ARINC 743 Global Positioning System Sensor Units (GPSSU) which are part of the Global Positioning System (GPS). These buses transmit the following data words:

 -
label 060: MEASUREMENT STATUS

 -
label 061: PSEUDO RANGE

 -
label 062: PSEUDO RANGE FINE 4

 -
label 063: RANGE RATE

 -
label 064: DELTA RANGE

 -
label 065: SV POSITION X

 -
label 066: SV POSITION X FINE 4

 -
label 070: SV POSITION Y

 -
label 071: SV POSITION Y FINE 4

 -
label 072: SV POSITION Z

 -
label 073: SV POSITION Z FINE 4

 -
label 074: UTC MEASURE TIME

 -
label 076: GPS ALTITUDE (MSL)

 -
label 101: HDOP

 -
label 102: VDOP

 -
label 103: GPS TRACK ANGLE TRUE

 -
label 110: GPS LATITUDE 2

 -
label 111: GPS LONGITUDE

 -
label 112: GPS GROUND SPEED

 -
label 120: GPS LATITUDE LSBS 2

 -
label 121: GPS LONGITUDE LSBS

 -
label 125: GPS UTC BCD

 -
label 130: GPS INTEGRITY LIMIT

 -
label 136: VERTICAL FIGURE OF MERIT

 -
label 140: UTC BIN FINE 4

 -
label 141: UTC BIN FRACTION 4

 -
label 150: GPS UTC BIN

 -
label 165: GPS VERTICAL VELOCITY

 -
label 166: GPS NORTH VELOCITY

 -
label 174: GPS EAST VELOCITY

 

 1EFF : 001-004, 1 34-14-00Page 2 1 1 Config-1 Aug 01/04R 1 1 1CES 1

 -
label 247: HORIZ FIGURE OF MERIT

 -
label 260: GPS DATE

 -
label 273: GPS SENSOR STATUS

 -
label 377: EQUIPMENT IDENT

 (2) Analog inputs The IR portion is provided with analog inputs for power supply AND GPS/IRS synchronization purposes. For more details Ref. 34-12-00.

R **ON A/C 001-004,
 Post SB 34-1147 For A/C 001-004,
 B. Inputs
 (1) Digital inputs
 (a)
 FMGC inputs The IR portion is provided with two ARINC 429 low speed buses from the two ARINC 702 Flight Management and Guidance Computers (FMGCs). These buses transmit the following data words:

 -
label 041: SET LATITUDE

 -
label 042: SET LONGITUDE

 -
label 270: FMGC DISCRETES.
 These data words are used for initialization and BITE purposes.

 

 (b)
 CDU input The IR portion is provided with one ARINC 429 low speed bus from the CDU. This bus transmits the following data words:

 -
label 041: SET LATITUDE

 -
label 042: SET LONGITUDE

 -
label 043: SET MAGNETIC HEADING

 -
label 277: CDU TEST.
 These data words are used for initialization and BITE purpose.

 

 (c)
 ADR inputs The IR portion is provided with three ARINC 429 low speed buses from the other two ADIRUs (ADR portion) and from its associated ADR. These buses transmit the following data words:

 -
label 203: ALTITUDE

　
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