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Guest Rico van Dijk

GPS Inhibit

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Guest Rico van Dijk

Has anyone tried the GPS Inhibit function in the FMS?

When I select this option the IRS becomes the position sensor for the FMS, but it jumps a few hundred miles.

Anyone else seeing this too?

 

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yes, perfectly normal, IRS drift

Geoff fernandez


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Simulator: Prepar3D 4.2 | A2A Comanche, MJC8, Leonardo MD-82, FSL320-X, NGX

Simulator: XP11 | FFA320 U, IXEG 737 Classic, JF Hawk T1, JF C152

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Quote

yes, perfectly normal, IRS drift

hundreds of miles?

Perhaps if you've been flying around the globe a few times without re-aligning your IRUs at every airport.

According to the Boeing Maintenance Manual, statistically, the drift rate should be less than 2nm per hour for 95% of the time.

If the error is more than 35nm for a flight of say 10 hours, the IRU should be replaced. If the error is more than 25nm for two consecutive 10 hour flights, the IRU should be replaced (this is assuming the IRUs are re-aligned after each flight).

There are tables in the Boeing manuals which help you determine if the IRUs are inoperative.

Cheers

JHW


John H Watson (retired 744/767 Avionics engineer)

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Thanks for the replies, I fully re-align after every sector, it works normally now, perhaps it has something to do that I re-positioned the aircraft on the ground (select airport in FSX) on that flight, normally don't do that.

anyways it works alright now. thanks!


vpa118.png

Rico van Dijk

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Whoops, it happened again, now I'm sure it's a bug.

I captured it with two screenshots. in the first you can see the position jumped way off (not immediate, but short after inhibiting the GPS). with the result of the aircaft banking to return to course.

http://steamcommunity.com/sharedfiles/filedetails/?id=879413503

Only a few moments later it jumped back into the correct position.

http://steamcommunity.com/sharedfiles/filedetails/?id=879413526

 

 


vpa118.png

Rico van Dijk

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18 minutes ago, ustyva said:

now I'm sure it's a bug

In that case, I'm sure you've reported this via the support portal, yes?


Kyle Rodgers

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You beat me to it but I'll do it right away!

edit: Done!


vpa118.png

Rico van Dijk

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2 hours ago, ustyva said:

You beat me to it but I'll do it right away!

edit: Done!

Excellent. Many thanks.

  • Upvote 1

Kyle Rodgers

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