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IRU Question  
User currently offlineStoicescu From United States of America, joined Sep 2005, 79 posts, RR: 0
Posted (9 years 1 week 6 hours ago) and read 1525 times:

Let's assume the following scenario:

You move the IRS switches to Nav and during the 10 minutes (more or less depending of aircraft) the aircraft gets moved because of some reason...You get IRS failed! How far back do you have to go with the IRU setup to restart it? (do you just move it to off and than to Nav again or you have to enter your position again also)

What is your company SOP saying about the economy setting in the FMS. It is said 80 is the standard option to use however I guess because of the current fuel prices some companies will go for lower numbers.

All my respect,
Stoicescu

5 replies: All unread, jump to last
 
User currently offlineNonfirm From United States of America, joined Sep 2005, 434 posts, RR: 0
Reply 1, posted (9 years 1 week 5 hours ago) and read 1506 times:

I HAVE SEEN SEVERAL IRU FAILURES AND WE HAVE SWITCHED THEM OFF AND BACK ON AND ALL WENT WELL.NORMALLY GET THIS AS A RESULT OF THE TOW FROM GATE TO GATE.

User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 1 week 4 hours ago) and read 1501 times:

Back in the day, I saw 100, and even 300 one time when the FO needed to get home quickly. High cost indexes compared to now.

DeltaGuy


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 1 week 1 hour ago) and read 1485 times:

If the aircraft is moved while tha IRU are aligning, on the 744 they have to be recycled to off and then to nav. The PPOS has to be inserted. The route might or might not stay in there.

At my airline we use 130 on the cost index. If the flight is late then we can go up to 250.


User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 4, posted (9 years 6 days 20 hours ago) and read 1477 times:

That's one of the nice features of the ADIRU's installed in the 737NG fleet. The software has been programmed to simply stop the alignment until the aircraft is still again and it picks up where it left off. It's also very tolerant of position errors so moving the aircraft across the field probably won't cause a position crash.
That's a bit simplified but that's how it works.
Ah software...
 Smile



One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlinePW2040 From Denmark, joined Nov 2004, 59 posts, RR: 0
Reply 5, posted (9 years 3 days 19 hours ago) and read 1407 times:

Hi Guys.

On the B767-200 in my company we use 65 as a standard which approx. gives around .80 and on the B757 we used 40 ( .80 ) as standard.

Greetings,
PW2040


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