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Shermann

An Information About ADIRU

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Hi Everyone!

 

I Have a question ! what happen to the avigation system if the Adiru is in off position during the flight? As today i was flying from VHHH to VSTP and before landin i checked if all system were on and set and i noticed the ADIRU was in off position but the plane flew the route normally. Is this normal? 

 

Thanks 

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I think under ADIRU failure the PFC (Primary Flight Computers) takes over.  Just a guess reading your post during a flight and looking at the overhead, I see the PFC is right under the ADIRU.  Again, its just a guess but I think that would be the redundant system for the ADIRU.

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It was not a failure i think i clicked it for error during climb or cruise! As ten i simply click it and was in on position. During the all flight i didnt have any messages warning me about the adiru was in off position and the plane followed the route perfectly so i was wondering if this is a normal behaviour or a bug.

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Well it you turned it off, it was off and that would be a failure IMO as the system was failing to work.

 

Failure doesn't mean a rat has to eat the wires in half.

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It was not a failure i think i clicked it for error during climb or cruise! As ten i simply click it and was in on position. During the all flight i didnt have any messages warning me about the adiru was in off position and the plane followed the route perfectly so i was wondering if this is a normal behaviour or a bug.

Just looked your answer up, the SAARU takes over when ADIRU is not working, although you should have gotten a "NO INERTIAL POS" message.

 

Secondary Altitude Air Data Reference Unit (SAARU)

 

SAARU is mentioned a lot on both FCOM's but FCOMv2 page 11.20.5 takes about if the ADIRU fails and this system takes over.

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If the switch is in the off position I know you won't lose the adiru in flight just in case it was switched off inadvertently, I don't remember if there's a time delay before it goes off in flight or it cannot manually be switched off in flight.

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