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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 


Alfredo Russo

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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.


-Raven Harris
Intel i7 980X @ 4.43GHz | ASUS Rampage III | Corsair 6GB DDR3 2000MHz | 3 EVGA GTX280 | Corsair 1200 Watt | Intel 510 SSD (RAID 0)
PMDG - 747-400/8iF | MD11/F | BAe J41 | 737NG 6/7/8/9 Hope ER/BBJ|777LR/F
Flight1- Cessna Mustang

 

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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.


Alfredo Russo

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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.


-Raven Harris
Intel i7 980X @ 4.43GHz | ASUS Rampage III | Corsair 6GB DDR3 2000MHz | 3 EVGA GTX280 | Corsair 1200 Watt | Intel 510 SSD (RAID 0)
PMDG - 747-400/8iF | MD11/F | BAe J41 | 737NG 6/7/8/9 Hope ER/BBJ|777LR/F
Flight1- Cessna Mustang

 

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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.


-Raven Harris
Intel i7 980X @ 4.43GHz | ASUS Rampage III | Corsair 6GB DDR3 2000MHz | 3 EVGA GTX280 | Corsair 1200 Watt | Intel 510 SSD (RAID 0)
PMDG - 747-400/8iF | MD11/F | BAe J41 | 737NG 6/7/8/9 Hope ER/BBJ|777LR/F
Flight1- Cessna Mustang

 

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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.


Bryan Richards

 

"People depend so much on automation that they forget how to get the automation to work." B.W.

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If you turn it off in flight it has no effect. 


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- Luke Pabari

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