User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
4--77
Inertial systems supported: ARINC 704 IRS, ARINC 705 AHRS, ARINC 738 ADIRS,
and other non-- ARINC standard interface.
GPS system supported: ARINC 743/743A.
FMC system supported: ARINC 702 Flight Management System and other
non-- ARINC standard interface.
The minimum External Sensor input accuracy accepted for True Track Angle is 1
Degree from a primary source (GPS/FMS) and 5 Degrees from a secondary (Inertial)
source.
(4) Radio Altitude (Digital/Analog)
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CAS accepts u p to 3 analog Radio Altitude inputs or 3 Digital ARINC 429 Radio
Altitude inputs. Digital Radio Altitude Inputs 1 and 2 are shared with the TCAS
function.
The external LRUs/External Sensors providing the data parameters must provide an
input to the T
2
CAS that is within the range of ±3 ft. or 4% from 0 to 500 ft. and 5%
when above 500 ft.
The e lectrical pin connections for the Digital/Analog Radio Altitude is listed under
Table 4--6 of the TAWS/RWS Non--Configurable Pinout and Pin Description section.
(a) Digital Input
The Table below shows the ARINC 429 digital interface characteristics for the
ARINC 707 radio altimeter system. Two of the ARINC 429 input busses
(RADIO_ALTITUDE_1 and RADIO_ALTITUDE_2) are shared with the TCAS
ARINC 429 Radio Altitude Inputs. The TAWS input circuitry is independent from
TCAS.
Radio Altitude
429 Label:
164 (Octal) Unit s: Feet Max Range: ±8,192 Feet
Appox. LSB: 0.125 Data Bits: 16
13(lsb) -- 28(msb)
Sign Bit: 29
0=Up,1=Down
Pad Bits: 11, 12 Transmit Interval:
25--50ms
Data Type: Two’s Complement
Binary
(b) Analog Input
The Analog Radio Altitude inputs are compatible with an ARINC 552 Radio
Altimeter system and may have a number of different input formats as defined for
specific aircraft requirements. The external connector pins for Analog Radio
Altitude Inputs #1 and #2 are shared by TCAS and TAWS/RWS, both have
independent circuitry.