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Forum: Tech Log

15th Sep 2010, 18:27

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

Thanks Rudderrudderrat, it was an option to...

Thanks Rudderrudderrat,

it was an option to freez the IRS. I didn't do that, but maybe it did itself. There was no message. The coordinates were lost (dashes).
There are still things to be...

Forum: Tech Log

14th Sep 2010, 13:14

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

I checked today the heading drifting in...

I checked today the heading drifting in "ATTITUDE" on airplane with conventional IRS panel. The heading decreased on the panel and on ND as it was expected. I still can't understand why the true...

Forum: Tech Log

13th Sep 2010, 08:21

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

Yesterday I measured the drift on ground in...

Yesterday I measured the drift on ground in "ATTIUDE".

It was a brand new Airbus and on this there is no display on the IRS mode selector panel, but only on FMGS MCDU. On MCDU it is indicated...

Forum: Tech Log

11th Sep 2010, 10:14

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

Yes BOAC, this could be the answer. Maybe in...

Yes BOAC, this could be the answer.
Maybe in "Attitude" there is no correction for the earth's rotation as the system doesn't know the lateral position. Off course change of variation also plays,...

Forum: Tech Log

11th Sep 2010, 09:09

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

Thanks BOAC, but in this case why we have...

Thanks BOAC,

but in this case why we have to reset the heading frequently in "ATTITUDE" mode? I already tried it, and really after about 10 minutes the deviation was 3-4 degrees. The gyro is the...

Forum: Tech Log

11th Sep 2010, 05:53

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

Inruder is not fully right. It is not possible...

Inruder is not fully right. It is not possible that the gyro is just keeping the north during fllight.
On ground it is determined from the turn of earth, that's why we have to provide the system...

Forum: Tech Log

10th Sep 2010, 20:45

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

I mean that the IRS determines the true north...

I mean that the IRS determines the true north during alignment on ground.
But how it can keep it in flight? Off course a gyro can keep it for a while, but without update we would see the deviation...

Forum: Tech Log

10th Sep 2010, 13:55

Replies: 52

True north and IRS

Views: 14,306

Posted By Lotetu

True north and IRS

Good morning,

I would like to know how the true north is updated in the IRS during flight.

Thanks,

Lotetu

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