A question about EAC...

[dmagnusson]

Have a small question...

 

How does i get the EAC to work?

 

I' training with the start up and have even written down exactly what Obama say in the start up tutoriol...

 

But when i try myself i cant get that EAC to work :-|

 

Any tips? I'm banging my head in the wall soon.

 

/Thx Dan M

[Echo38]

CDU and EGI switches (the only two unmarked switches on right console) must be on (flipped forward), then turn on all four SAS channels to the left of the throttles. After turning the CDU and EGI switches on, you must wait on the ground for 4 minutes without moving the aircraft. Once the INS NAV READY text is flashing (not merely displayed, but flashing) on the CDU display, then hit the OSB beside the NAV text on the CDU display (not the NAV button just below the CDU, which is something different altogether). Once you've done all that, select the EGI button from the NAV panel to the fore of the stick. Flip the EAC switch underneath the throttle from OFF to ARM.

 

If you followed these steps, it should work. If you did anything out of order, you need to restart the entire process from scratch. Also, there are several additional things which can "break" it, requiring you to restart. Hitting the OSB beside the "NAV" text, hitting the EGI button behind the stick, or attempting to engage the EAC switch--any of these actions, before the 4 minutes are up, will screw it up, and you'll need to restart it. When ready, it should read: 4.0 0.8

 

It's good to start up unrelated things while the CDU and EGI are starting up--for example, this would be a good time to start your engines. Because of the 4-minute wait, CDU and EGI are the first things you should turn on once your APU generator is operating.

Edited September 18, 2012 by Echo38

[dmagnusson]

CDU and EGI switches (the only two unmarked switches on right console) must be on (flipped forward). After turning them on, you must wait on the ground for 4 minutes without moving the aircraft. Once the INS NAV READY text is flashing (not merely displayed, but flashing) on the CDU display, then hit the OSB beside the NAV text on the CDU display (not the NAV button just below the CDU). Once you've done all that, select the EGI switch from the NAV panel to the fore of the stick, then turn on EAC. If you followed these steps, it should work.

 

hello

 

great thx :-) gone try it

 

/Dan M

[Echo38]

Damn, sorry--made a mistake--you also have to turn on the SAS. Hold while I go through the whole process in-sim to be sure. I'll get back to you in a few minutes.

[dmagnusson]

Damn, sorry--made a mistake--you also have to turn on the SAS. Hold while I go through the whole process in-sim to be sure. I'll get back to you in a few minutes.

 

Okey :-)

 

Nps

 

/Dan M

[Echo38]

Okay, pretty sure I got it right now. I've edited my initial response with the corrected procedure.

[EddieMuntz]

I had the same issue for ages, the CDU repeater needs to read 4.0-8.0,

It takes a while to align, but because you get quicker at start up its not aligned when you come to it. i generally take this time to set up my DSMS profiles and get the EO warmed up on the mavericks.

[Echo38]

I had the same issue for ages, the CDU repeater needs to read 4.0-8.0

 

When ready, it should read: 4.0 0.8

 

not 4.0 8.0

 

The first two digits are the time elapsed; I don't know what the other two digits are. Someone told me it was a number indicating calibration accuracy, or something like that.

[dmagnusson]

ahh great thx again :-)

 

now it should probebly work :-)

 

/Dan M

[badger66]

When ready, it should read: 4.0 0.8

 

Agreed , but I got a weird on a few days ago ..... 4.0.3.2 ..... never seen that before , nor since ? I would also like to know excatly what these numbers mean .

Edited September 17, 2012 by badger66

[Tailgate]

4.0.3.2 means you're super aligned? ;) I would image in RL each bit means something (error codes, perhaps?) There's also the status page which may show errors if there are any.

[MTFDarkEagle]

4.0 0.8

4.0 is the allignment time (i.e. 4.0 minutes)

0.8 is the navigation error. The lower the better.

[Tailgate]

Good info, it's a deviation. My guess would be if you start rolling before locking in Nav mode you'd get a deviation error?

 

 

eta:

I'm sure in RL there are a lot of other factors for the deviation.

Edited September 17, 2012 by Tailgate

[MTFDarkEagle]

If you start moving while in ALIGN mode it automatically switches on NAV mode, regardless of aligntime.

[Wrecking Crew]

Yes, the number is not always 4.0.0.8.

 

What you want to wait for is the flashing INS NAV READY, or what ever it says. Wait for that at the top of the CDU screen and then you are good to turn on the EGI. Then turn on EAC and the other one next to it under the throttle.

http://simhq.com/forum/ubbthreads.php/topics/3496832/DCS_A_10C_Ramp_Start_Up_Guide_.html#Post3496832

 

 

I think the actual number depends upon the airfield to some degree.

 

Wrecking Crew

[MTFDarkEagle]

Yes, the number is not always 4.0.0.8.

 

What you want to wait for is the flashing INS NAV READY, or what ever it says. Wait for that at the top of the CDU screen and then you are good to turn on the EGI. Then turn on EAC and the other one next to it under the throttle.

http://simhq.com/forum/ubbthreads.php/topics/3496832/DCS_A_10C_Ramp_Start_Up_Guide_.html#Post3496832

 

 

I think the actual number depends upon the airfield to some degree.

 

Wrecking Crew

No it does not depend on the airfield. It will allways be those numbers. It is purely the time since alignment start (i.e. 4 minutes) and the navigation error. Not sure what unit it is in, my memory isn't serving me at the moment.. :P But it's not dependant on the airfield you are at.

[Eddie]

Not sure what unit it is in, my memory isn't serving me at the moment.. :P But it's not dependant on the airfield you are at.

 

Nautical Miles Per Hour, and you're correct is does indeed indicate INS drift.

[Wrecking Crew]

It will allways be those numbers.

 

Regardless of why, it can be different - I've seen it, too. I used to think, just wait for 4.0.0.8, but that is not always the case - instead wait for the flashing INS NAV READY indication.

 

WC

[Eddie]

It can only be different if you don't allow the EGI to perform a full alignment, which takes 4 mins. Hence the 4.0.0.8.

 

There is no other situation which would give a different alignment value, those number are there to indicate the alignment time elapsed and INS drift value, there are no variables beyond the pilot.

[Tailgate]

Sounds like it's a hardcoded value once the time reaches 4 mins.

[Eddie]

Indeed, as INS drift isn't modelled at present, and even if it was you'd only experience it if the GPS network was unavailable due to jamming or a failure in your aircraft.

[woofer15]

When ready, it should read: 4.0 0.8

 

not 4.0 8.0

 

The first two digits are the time elapsed; I don't know what the other two digits are. Someone told me it was a number indicating calibration accuracy, or something like that.

 

Someone is precisely correct :) The second # is calibration accuracy measurement indicated here by fold increase in inaccuracy. In other words, 7.2 means that under normal manuevering you will experience navigational errors (drift, etc) at a rate 7.2X greater than when fully aligned. A reading of 1.0 would indicate errors on par with normal gyroscopic drift and precession while 0.8 means simply that errors can be self-compensated -to a degree, under normal maneuvering- by the internal moment calculations in the INS.

[MTFDarkEagle]

Someone is precisely correct :) The second # is calibration accuracy measurement indicated here by fold increase in inaccuracy. In other words, 7.2 means that under normal manuevering you will experience navigational errors (drift, etc) at a rate 7.2X greater than when fully aligned. A reading of 1.0 would indicate errors on par with normal gyroscopic drift and precession while 0.8 means simply that errors can be self-compensated -to a degree, under normal maneuvering- by the internal moment calculations in the INS.

 

Uuuuh wha? The number of INS drift is nautical miles drift per hour. I.e. if you have 0.8 drift on the INS allign, and you fly straight for 1 hour you will get 0.8 nm drift. However, if you test this in the sim this wont happen because it is automatically compensated with GPS.

[Echo38]

So, if I understand this aright, in a real A-10, set to INS instead of BLENDED or GPS, your TAD will eventually start to show you being somewhere different than you actually are. But what about SAS? That uses the INS system, but that wouldn't be affected, would it?

[sobek]

The SAS needs way less precision than a moving map, because error on the map is cumulative, on the SAS it's not that important.