Questions tagged [air-data-computer]

Use for ADC; combine with [inertial-nav-system] when referring to ADIRU or as applicable

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1 answer
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What could cause an air data computer interfaced via A429 to only display integer values?

I'm working with a Shadin 2000 air data computer interfaced via ARINC 429 to an Avidyne IFD 550. For some reason, the airspeed tape is flipping between discreet values, and not gradually increasing/...
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10 votes
1 answer
502 views

On the A330 why does switching off the ADRs require alternate LG extension and inhibit nose wheel steering?

In the incident examined in this video the pilots experienced an unreliable airspeed indication due to pitot tube blockage in an A330. They followed the abnormal checklist for unreliable airspeed ...
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1 vote
0 answers
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How is the voting mechanism and FDI algorithm applied in transport aircraft?

How is the voting mechanism applied in modern transport airplanes for airdata/inertial reference sensors fault detection and isolation (FDI)? Are there any other FDI methods approved by the regulators ...
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8 votes
1 answer
577 views

How does an air-data computer convert ram air pressure from the pitot tube into airspeed?

I know how the analog airspeed indicator shows the airspeed from the ram air pressure from the pitot tube. But I'd like to know how an air-data computer converts the raw pressure data to airspeed that ...
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14 votes
5 answers
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Is the Mach number shown by an Air Data Computer considered a "true" Mach number?

I am trying to find more information on "true" vs. "indicated" Mach number (not airspeed). I've found older fighter aircraft manuals online that have a conversion chart from one to the other, but the ...
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