There are 3 air data reference functions (ADRF), one in each flight control
module (FCM). The software is loaded as part of the FCM data load operation.
The ADRF does these functions:
- Manages air data input redundancy
- Calculates air data
- Controls probe heat
- Detects and reports system faults.
Each FCM gets static and pitot pressure data from all 4 actuator control
electronics (ACE). The ADRF uses this data in its calculations:
- Pitot pressure
- Static pressure
- Temperature
- Probe and sensor heat status
- Angle of attack (AOA)
- Pitch and roll angles
- Linear accelerations
- Vertical speed
- Speedbrake handle position
- Stabilizer position
- Air/ground.
The ADRF calculates:
- Computed airspeed (knots)
- True airspeed (knots)
- Mach number (Mach)
- Pressure altitude (feet)
- Total air temperature (TAT) (degrees C)
- Static air temperature (degrees C)
- Static pressure (mBars)
- Total pressure (mBars)
- Impact pressure (mBars)
- Altitude rate (ft/min)
- Barometric altitude
- Voted air data
- Back-up airspeed.
Each ADRF gets data from the 3 pitot air data modules (ADM) and the 3 static
ADMs. For pitot and static data, the ADRF selects the middle value of the 3
inputs to use in voted air data calculations. This is called mid-value selection.
If an input fails, the ADRF uses the last calculated value as the third input. The
ADRF also calculates backup air data.
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