problem with EAC

[fighter1976]

Hi! Have a problem when start up the plane. Everyhing is ok, except the EAC. It stays on (the warning light) and all the CBU 107 in the DSMS show a text saying "ALN UNS"-when flying it can't be deployed. What am I missing?

Thanks

[Sryan]

You need to wait for allignment to complete ( it should say T = 4.0.0.8 on the CDU) before you press NAV. You then need to flick up the EAC switch below the throttle ( you can't do that if allignment didn't complete).

[BaconSarnie]

You need to wait for allignment to complete ( it should say T = 4.0.0.8 on the CDU) before you press NAV. You then need to flick up the EAC switch below the throttle ( you can't do that if allignment didn't complete).

You missed press the EGI swicth on the panel at the bottom, just behind the stick. Press that after pressing the NAV OSB next to your MFCD.

[Zabuzard]

Middle section:

 

http://forums.eagle.ru/showpost.php?p=2744816&postcount=2

[fighter1976]

followed the indications but "ALN UNS" still shows-although the EAC is working now...another thing -before even the GBU 38 was reading "ALN UNS", now at least the GBU 38 is working, but CBU 105 is still not...

[Zabuzard]

Mhh, please crosscheck your startup checklist with a checklist that you know works.

 

If I don't forget anything the steps are:

- Wait for automatic ground alignment to finish (4.0 0. 8, do not move the aircraft while aligning)

- Click Nav on the CDU to start the navigation system and exit alignment

- Select EGI as navigation data source (GPS system, button located under the ADI)

 

Also make sure:

- IFFCC, JTRS and CICU on (bottom of weapon control panel)

- EAC on (confirm that warning light goes off)

- SAS on

 

Afaik then it should not read "ALN UNS" anymore, even on ground before takeoff it would already read "RDY".

If it still shows ALN UNS you're probably doing anything in the wrong order at your startup procedure.

[fighter1976]

Ok , will do that..one more question I forgot what SAS stands for...:cry:

[Aginor]

Stability Augmentation System. :)

[fighter1976]

still blurry:cry: how do you engage it?

[GurbY]

4 switches on the left panel...

[Zabuzard]

Image with all stuff I mentioned:

 

 

 

EAC - Enables autopilot and gun stability system (PAC)

SAS - Enables control input dampening system, flying smoother, needed for EAC and other stuff to work

EGI - Enables EGI as navigation data source, this is a GPS system

IFFCC - flight and fire control computer, also enables HUD

JTRS - Enables datalink system, you can see other aircrafts on the TAD

CICU - Central Interface Control Unit, enables MFCDs and subsystems

[fighter1976]

:doh: I knew them..forgot it all means SAS:music_whistling:

[fighter1976]

it works now..you have to wait a little even after the alignment is done until CBU 105 says "RDY"

[rnb197]

I had the same problem with the EAC.... flicked it on at the correct place in the check list but it didnt stay on. Once i programmed one of my throttle switches to that command it worked perfectly... try that.

 

Best of luck.