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windshearDK

weird airspeed issue

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I have now seen this happen only twice, but they are flights apart, so they both happened within proximity of one another.

 

Nothing is wrong during climb or descent, but during cruise, the green speed acceleration indicator is moving up and down, up and down, making the plane loose altitude and climb then descend, in total madness!

 

I have been flying with out such issues for quite some time now, so I do not identify anything wrong on my part, setup wise.

 

Also I noticed during ADIRU alignment, I had to reenter the coordinates after it suddenly needed the digits again.

 

Please any ideas on what is happening to my new baby?

 

Plus on my backup PFD sometimes it flashes black and it says: "WAIT ATT"?!?!

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Please any ideas on what is happening to my new baby?

 

Common problem, and about a billion threads here in the forum about it.

 

If you're using ActiveSky, or similar, use DWC mode to smooth the winds.  If you're using another weather program, crack open the manual to look at the different depiction modes they offer.  If you're using FSX default stuff, you need to either not use it, or buy FSUIPC and enable wind smoothing.

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I use AS2012, but I tried quitting it and clearing all weather, but the problem stayed even with no wind.

 

I am a very experienced simmer, and I have witnessed previous issues with activesky with the 747X, and this seems not to be as a result of this program.

 

I have flown the NGX since it came out with out anything like this... Why is the backup PFD showing: "WAIT ATT" ? 

 

I have FSUIPC payed and installed, so I will of course check up on that program to make sure it smooths out the winds

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ATT means you have a problem with the air data (ADIRU) source feeding your ISFD.

 

I'll have a look for the exact msg.

 

EDIT - give this a try, push the ATT reset switch, hold for at least 2 seconds, reset takes approximately 10 seconds

 

WAIT ATT (Amber) - Indicates temporary self correcting loss of attitude.

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I did have issues with my ADIRU alignment before the flight... Where is this ATT reset button? Any other info on what could cause this fault?

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ATT reset is at the bottom left of your ISFD. I had a look through the maintenance manual but couldn't find anything, also nothing in the QRH.

 

WAIT ATT is the result of your problem, not the cause. Your problem is definitely with the ADIRU and likely an issue with the align during preflight.

 

I don't own the PMDG 777 so not sure what it is says in your docs regarding the ISFD. My FCOM ref is 10.10.44 you can check your docs and see if it matches.

 

Regards

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 Also I noticed during ADIRU alignment, I had to reenter the coordinates after it suddenly needed the digits again.

 

During allignment?

Make sure you dont move the aircraft during allignment cause then it starts all over.

 

During taxi the ADIRU sometimes auto re-aligns if you stop long enough.

No need to put in new coordinates then, just ignore that, it is normal.

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Yes at the gate alignment was started, then I went back to the init ref page and the coordinates were all boxes again, so I had to dial in my position, and the counter restarted, was a strange thing.

 

I am not moving my plane, again please remember, I am an experienced simmer and I have flown this 777 for over a 100 hours already with thousands in the NGX...


ATT reset is at the bottom left of your ISFD. I had a look through the maintenance manual but couldn't find anything, also nothing in the QRH.

WAIT ATT is the result of your problem, not the cause. Your problem is definitely with the ADIRU and likely an issue with the align during preflight.

I don't own the PMDG 777 so not sure what it is says in your docs regarding the ISFD. My FCOM ref is 10.10.44 you can check your docs and see if it matches.

Regards

 

I think there is some issue. I did have an issue aligning the ADIRU, and I think the source of the problem is to be found there. I used a saved cockpit after an uneventful flight, but I did have an issue I described in the post above... Any thoughts? Bad panel state save?? 

 

After second alignment everything looked fine! All the way up to TOC there was no problem at all

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Do the boxes also come with an FMC message?

Like "enter Inertial Position"?

 

If all power is removed from the ADIRU AFTER it has been alligned (which should not be possible because it should stay powered by the HOT Battery Bus, but could be modelled incorrectly) then that could also be a cause of having to reallign.

Or if you turn the ADIRU switch off for more than a few seconds, then you must also reallign.

 

If the ADIRU is alligned then your PFD and ND change from black to normal colours.

As long as they stay normal and you dont get an FMC message you do not have to enter a new position.

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I know all of the above, please I am not a beginner!

I am doing my preflight CDU setup and then when I press the INIT REF page it shows the boxes.

 

I don't remember any EICAS message, but I dial in the coordinates again. No power has been lost and of course I wouldn't shut off the ADIRU during the alignment process

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Ok Boaz,

 

Let's both do some work that involves reading the documentation :) I'm going to find out exactly where the ISFD gets it data from.

 

Can you answer a question, I had a look at a screenshot of the PMDG 777 and the Standby PFD as you call it does not look like the ISFD installed on the Qatar 777 freighters, I only have access to to real world documentation so don't want to waste time investigating for you, Can you confirm you actually have an ISFD installed on your addon?

 

Cheers

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I am using the Emirates paint scheme with PMDG setup which means only one backup instrument... I can supply a screen shot if you want?

 

And sorry for my lack of proper naming, it's just, well I fly the darn thing I don't talk to the instruments  :P

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I know all of the above, please I am not a beginner!

I am doing my preflight CDU setup and then when I press the INIT REF page it shows the boxes.

 

I don't remember any EICAS message, but I dial in the coordinates again. No power has been lost and of course I wouldn't shut off the ADIRU during the alignment process

I am not saying you are a beginner, I am just ticking off things from my list that could cause what you are seeing. I can stop doing that ofcourse if it annoys you.

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I know you are trying to help, but I am letting you know that your list starts with causes that are way too simple!

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I know you are trying to help, but I am letting you know that your list starts with causes that are way too simple!

Very often the solution to a problem is actually quite simple :-)

Ok. What happens if you dont put anything into the boxes?

Is everything still ok, position correct, PFD and ND displaying properly?

(I would try an allignment myself but I am abroad so cant)

 

If so, then maybe the boxes appearing are a bug and you should report it to PMDG.

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Boaz,

 

Can you replicate this issue? I think it is good that Rob is covering the basics, it also helps others that may read this in the future with a similar problem.

 

Anyway, I trawled through a bunch of docs and came up with nothing, if you are doing everything correctly as you say then you shouldn't be seeing this issue.

 

We have to remember we are flying software and windows files that can become corrupt. I would suggest using a differant panel state, of if the problem persists submit a ticket for the big boys to take a look at.

 

Cheers

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Ok I will try to use a different panel state, it's a strange issue indeed.

 

Maybe the fact that the boxes appear and I am punching the coordinates in again causes some kind of error. But it still boggles my mind why!

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Maybe the fact that the boxes appear and I am punching the coordinates in again causes some kind of error.

 

I'm not sure how it handles this, but I remember that the 744 would ask you to insert the position twice if it was powered up in a different spot than when it was left.

 

Example:

You landed at EGLL and quit the sim.  When you load back up at YSSY in the next sim session, the 744 would ding and ask you to enter the data again to confirm being in the new position is normal.

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That's the strange thing, because I always save at the specific airport, so I start up the return flight with a saved panel state from that airport.

 

I now am flying back, using the default "long turn around" panel state, and everything is fine and dandy...

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I've noticed some issues with an APU bug and alignment (asking twice for co-ord, entered once after countdown, asked again some time later in pre-flight) when using saved panel states.  Could it be a bug?  

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I've noticed some issues with an APU bug and alignment (asking twice for co-ord, entered once after countdown, asked again some time later in pre-flight) when using saved panel states.  Could it be a bug?

 

What APU bug is that? I have not looked at the "known bug list" for a while so forgive me if that is actually on there.

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I've noticed some issues with an APU bug and alignment (asking twice for co-ord, entered once after countdown, asked again some time later in pre-flight) when using saved panel states.  Could it be a bug?  

 

 

Please explain because your description is similar, what was the connection again between the APU and the countdown?

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So I was planning my next flight after my last successful flight, using the panel state I saved after gate arrival.

 

So I take off and reached my cruising altitude and then the speed thing started all over again!! I have no idea what is wrong here. I did something new though, I saved my flight and exited and reentered FSX. Then I could continue the cruise. But when doing a step climb it started again.

 

This is super strange I have no idea what is wrong! I checked the smooth wind thing, but no result. Plus the winds are steady, they are not shifting in either direction or speed.

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Maybe I found the source of my errors?

 

I noticed that two FSUIPC's were in my list of programs in the FSX.cfg. This has caused strange errors before, with FSDreamteam scenery after updating the addon manager...

 

I will test tomorrow

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