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| 3| Rt | (TAT ) (TAT ) (TAT ) (TAT) | -- = 1 + a | TAT - d (--- -1) (--- ) - b (--- -1) (---) | Ro | (100 ) (100 ) (100 ) (100) |
 --TAT = temperature in deg.C (TAT) Rt = Resistance at temperature TAT Ro = Resistance at 0 deg.C = 500 ohm a = 0.003832 d = 1.81 b = 0.1 for temperature below 0 deg.C b = 0 for temperature above 0 deg.C
 The computation also compensates the TAT value for heating effect. The ADR knows when the sensor is heated by the state of the TAT Heat input discrete from the PHC. The heating compensation law is provided by the TAT sensor supplier and is function of Mach and air density. The PHC 1 controls the heating of the TAT sensor 1 and the PHC 2 controls the heating of the TAT sensor 2. On the ground, the sensors are not heated (Ref. 30-31-00 for more details). The result of the above computation is available on the following output labels:
 -
label 211 Total Air Temperature (BNR)

 -
label 231 Total Air Temperature (BCD).

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 Temperature (TAT) Computation - Block Diagram
 Figure 003

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 (c) AOA computation (Ref. Fig. 004) The A/C is wired in the AOA unique selection, so the ADR computes the AOA with the reading of one resolver. The second resolver is used as a back-up. The monitoring function is described in 34.18 The ADR determines the corrected angle of attack value which depends on the system number and the slat/flap position. For a CAS less than 60 kts: AOAc = 0 and status matrix is coded NCD. For a CAS more than or equal to 60 kts, the corrected angle of attack is calculated as follows:
 AOA ind AOAc = -------+ I
 K where: AOA ind = Indicated Angle of Attack (Ref. 34-11-00 for
 the relation between resolver and AOA indication)
 K, I = Correction coefficients which depend on system number, slat and flap configuration and magnitude AOA indication.
 The configuration is defined by the status of four input
 discretes (Ref. 2.A.(2)(c)).
 The results of the above computation is available on the labels:

 -
label 221 = Indicated Angle of Attack

 -
label 241 = Corrected Angle of Attack

 

 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-13-00Page 18 1 1 Config-3 Aug 01/05 1 1 1CES 1

 SFCC/AOA Alternate Discrete Signals
 Figure 004

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R  **ON A/C 401-499, 
R  (c) AOA computation 
R  (Ref. Fig. 004) 
R  The A/C is wired in the AOA unique selection, so the ADR computes 
R  the AOA with the reading of one resolver. The second resolver is 
R  used as a back-up. The monitoring function is described in 34.18 
R  The ADR determines the corrected angle of attack value which 
R  depends on the system number and the slat/flap position. 
R  For a CAS less than 60 kts: AOAc is still computed , and status 
R  matrix is coded NCD. 
R  The corrected angle of attack is calculated as follows: 
R  AOA ind 
R  AOAc = -------+ I 
R  K 
R  where: 
R  AOA ind = Indicated Angle of Attack (Ref. 34-11-00 for 
R  the relation between resolver and AOA indication) 
R  K, I = Correction coefficients which depend on system 
R  number, slat and flap configuration and magnitude 
R  AOA indication. 
R  The configuration is defined by the status of four input 
R  discretes (Ref. 2.A.(2)(c)). 
R  The results of the above computation is available on the labels: 
R  - label 221 = Indicated Angle of Attack 
R  - label 241 = Corrected Angle of Attack 

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 (4) Parameter computation
 (a)
 General The operational software of the ADR performs the following computations:

 -pressure altitude and pressure altitude rate function (ALT)
 -Mach function (M)
 -airspeed function (CAS/TAS)
 -temperature function (SAT/TAT)
 -maximum operating speed function (VMO/MMO).

 (b)
 Altitude computation

 The ADR software computes these different parameters: label 203 Pressure Altitude label 212 Altitude Rate label 204 Baro Corrected Altitude 1 (CAPT) label 220 Baro Corrected Altitude 2 (F/O) label 235 Baro Correction In Hg 1 (CAPT) label 237 Baro Correction In Hg 2 (F/O)
　
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