PPRuNe Forums - View Single Post - ADC inputs
Thread: ADC inputs
View Single Post
Old 29th Aug 2011, 12:01
  #3 (permalink)  
westhawk
 
Join Date: Jun 2005
Location: USA
Posts: 951
Likes: 0
Received 1 Like on 1 Post
Representative 2nd and 3rd generation EFIS digital ADC inputs/outputs:
(Various airplane types may combine functions or vary considerably.)

The Lear 60 Digital Air Data Computers utilize sensor inputs from:

-static pressure ports
-pitot pressure probes
-TAT probe

Each DADC provides the following outputs directly to it's respective DPU:

-airspeed/mach
-altitude
-vertical speed
-SAT
-TAS
-over/under speed cues

Air data is also used by FADECs, mach trim, pressurization controller, gear warning, XPDR and a number of other air data dependent systems. FMS can compute ADC inputs to calculate a number of other air data values as well.

In the 60, the AOA vanes and indicators are two completely separate systems independent of each other. An AOA indicator is installed at each pilot station. AOA inputs are used by the stall computers to generate stall warning and to display 1.3 Vs (green line) on the PFD airspeed indicators. Flap position signals are used to bias the indicated AOA, 1.3 Vs display and stall warning activation threshold. An ADC >18,100' signal triggers a 15 kt additive to account for high altitude IAS/EAS differential.

So in short no, the AOA is not an ADC input, but may be used along with air data for certain purposes such as stall warning/recognition.

Hope this info was helpful.

westhawk
westhawk is offline