INS alignment doesn't commence, triggers UFC unresponsible

[Rongor]

As easy to see in the pic, all necessary data was entered, Lat/Lon, mag var.

Turning the dial into alignment lets the "time: 00:00" blink eternally. UFC is blocked, any inputs are ignored...

 

Yes, I have waited several minutes, this is a ground alignment. It just never starts. UFC remains unresponsive until I turn the dial back to off.

[zildac]

Is the parking brake on?

[Rongor]

wheel chocks are placed, so no need for them.

But as you can see in the pic, they are on, brake pressure is applied

Edited May 25, 2022 by Rongor

[Marsvinet]

I can not see anything that would be out of place.

But for future reference, you do actually need to have the parking brake engaged. There is a microswitch that the parking brake triggers when engaged, that allows the INS to start aligning. 

 

[zildac]

wheel chocks are placed, so no need for them.
But as you can see in the pic, they are on, brake pressure is applied

You need the parking brake on for alignment, regardless.

[Krez]

Did you enter the magnetic variance? It will do just that if you don't.

[Rongor]

On 5/26/2022 at 2:58 AM, Krez said:

Did you enter the magnetic variance? It will do just that if you don't.

I did, see my first post.

 

On 5/25/2022 at 8:48 PM, zildac said:

On 5/25/2022 at 11:36 AM, Rongor said:

wheel chocks are placed, so no need for them.
But as you can see in the pic, they are on, brake pressure is applied

You need the parking brake on for alignment, regardless.

I see. Would have been more clear this would be explained in the manual. Thanks

[zildac]

I see. Would have been more clear this would be explained in the manual. Thanks

You're welcome. I think I stumbled upon this fact in a YT tutorial when I first started with the Harrier a few months ago. I'm sure it's likely referenced in Chucks guide.

[Eugel]

It is in the manual.

"GND Selects INS align mode and commands the Mission Computer to provide a ground alignment display on the DDI provided that the parking brake is on."
(page 370 from the manual)

Also on page 376:
"Alignment Once the necessary data is in the system (LAT / LONG position and Magnetic Variation), pilot should verify that the parking brake is on and place the INS mode selector knob to the GND position (without pausing at the SEA). Ground alignment display will appear on the DDI"

And yes, Chucks Guide also mentions it in bold red letters.

Edited May 30, 2022 by Eugel

[Rongor]

On 5/30/2022 at 9:54 PM, Eugel said:

It is in the manual.

"GND Selects INS align mode and commands the Mission Computer to provide a ground alignment display on the DDI provided that the parking brake is on."
(page 370 from the manual)

Also on page 376:
"Alignment Once the necessary data is in the system (LAT / LONG position and Magnetic Variation), pilot should verify that the parking brake is on and place the INS mode selector knob to the GND position (without pausing at the SEA). Ground alignment display will appear on the DDI"

And yes, Chucks Guide also mentions it in bold red letters.

 

parking brake was on, you can see it in the pic

[exhausted]

Just confirming: we mean the throttle parking brake, right?

[zildac]

Just confirming: we mean the throttle parking brake, right?

Yes