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Standby Instruments ADIRS A320
Folks,
after reading all the stuff im totally confused. Cann somebody explain me in easy words, how the ADIRS System (ADR, IR, STBY) works in the A320? I always thought that we have 3 ADRs and 3 IRs. One Fails, we can Switch them to the side where it is lost. Do the ADR3 or IR3 give Inputs to the STBY ISIS? I thought it is a stand alone platform but the Manual obviously says that it gets Input from ADIRS 1 and 3? Some easy Explanation would help and thanks so much! SW |
Hi SW,
Some easy Explanation would help The input from ADIRS 1 and 3 are for heading information and something called "Accelerometer Gyrometer" (whatever that means). https://www.livescience.com/40103-ac...gyroscope.html explains why it is better to have a mixture of gyroscope (from ISIS) and acceleration information (from ADIR) to give a better attitude reference. It was discussed at length here: https://www.pprune.org/tech-log/4064...ru-inputs.html |
Do the ADR3 or IR3 give Inputs to the STBY ISIS?
No, the ISIS is fed by Stby probes only. However, ADR3 receives input from stby probes. In a nutshell, ADR3 readings on PFD's & ND's are visible only when switching AIR DATA to CAP/FO 3 |
As goldenrivet pointed, ISIS is fed by STBY ports and probes. There are air data modules in STBY ports/probes to provide anemometric data to the 3rd ADR. The confusion usually exists because in case of blockage in 1+2 the ISIS still works. The air data switching in position 3 recovers the problem and people associate the ISIS with ADR3, but in reality those 2 use the same tubes. |
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I hope they remember to pull all those stickers off before they go flying! :E
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OT, but SSA measurement is interesting
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The IESS on the Embraer, is the only part of the aircraft which uses 'classified' technology. |
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