Ps MACH = Mach number Qc/Ps = Ratio of impact pressure to static pressure
If Mach is below 0.1, the label 205 indicates 0 with SSM = NCD.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-13-00Page 15 1 1 Config-1 May 01/05 1 1 1CES 1
(d)
SAT/TAS computation The ADR software calculates these different parameters: label 213 BNR Static Air Temperature (SAT) label 233 BCD Static Air Temperature (SAT) label 210 BNR True Airspeed (TAS) label 230 BCD True Airspeed (TAS).
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the calculation of the BNR SAT converts TAT to SAT with: TAT SAT = ---------- 273.15 2
1 + 0.2M SAT = Static Air Temperature (in deg. C) TAT = Total Air Temperature (in deg. Kelvin) M = Mach number (corrected for static source error)
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the calculation converts Static Air Temperature from BNR to BCD format.
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the calculation of the BNR TAS converts Mach and SAT to TAS with: ___
/ TAS = 38.96695 x M x V SAT TAS = True Airspeed (in knots) M = Mach Number (corrected for Static Source Error) SAT = Static Air Temperature (in deg. Kelvin)
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the calculation converts True Airspeed from BNR to BCD format. For accuracy reason, the TAS is output with a valid (NO) SSM only after 60 kts. If TAS is below 60 kts, the label 210 indicates 0 kt with SSM = NCD.
(e)
VMO/MM0 computation The software determines the normal or alternate VMO/MMO law selected by the VM0/MM0 input 2 discrete state; then it computes the label 207 Maximum Allowable Airspeed. This airspeed is based on the Maximum Allowable Airspeed under a certain altitude and on the Maximum Allowable Mach above this altitude. It is always indicated in knots and decreases when the altitude increases.
NOTE : At a constant Mach, the Vc value decreases when the
____
altitude increases.
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(5) ADR data outputs The ADR data outputs are transmitted in two forms: digital and discrete.
(a) Digital form The table below contains all the output parameters in the digital form. They are sorted as per the numerical order of their output label. The following table gives:
-EQ.SYS.LAB.SDI : (SDAC, FWC, DMC...) output label for which the parameter is available
-PARAMETER DEFINITION: parameter name
-RANGE ACCURACY : measurement range maximum value transmitted. When the digital value changes, the change step is equal to the accuracy
-UNIT : unit in which the digital value is transmitted
-SIG BIT : indicates whether a sign bit is available
-BITS : number of bits used by the parameter in the label
-UPD/MSEC : output transmission interval. The refresh rate is given in milliseconds.
-CODE:
BNR: binary data word
BCD: binary coded decimal data word
ISO: data word coded in ISO5 code
DIS: discrete data word
HEX: hexadecimal coded
HYB: mixed code.
-ALPHA CODE: indicates the parameter mnemonic code
-SOURCE ORIGIN: parameter source computer or system.
-------------------------------------------------------------------------------| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) | -------------------------------------------------------------------------------|EQ.SYS.LAB.SDI|PARAMETER | WORD RANGE |UNIT|SIG |BITS|XMSN|CODE|ALPHA|SOURCE | | |DEFINITION| OPER RANGE | |BIT | |INTV| |CODE |ORIGIN | | |(*=REMARK)| RESOLUTION | | | | | | |BUS No.| | |(X=NOTE) | ACCURACY | | | | | | |ATA REF| | | | | | | | | | |CONV | -------------------------------------------------------------------------------| 047 |S/W IDENT | | | | |1000|BCD | | | |--------------|----------|------------|----|----|----|----|----|-----|-------| | 176 |L STATIC |W2048 |hPa | | 18 |125 |BNR | | | | |PRESSURE |100 to 1100 | | | | | | | | | | |R 0.0078 | | | | | | | | | | |+/- 0.30 | | | | | | | | |--------------|----------|------------|----|----|----|----|----|-----|-------| | 177 |R STATIC |W2048 |hPa | | 18 |125 |BNR | | |
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