1 hour ago, vonmar said:

Are you starting from cold and dark?

Which checklist (or steps) are you using?

I would like to try the same.

Yes, cold & dark, but not set as such from the EFB, but the state when the aircraft loads up in the sim. I'm using the checklists provided by FlightFX (the FULL one).

There's an excellent tutorial video of about 30 minutes that pretty much covers all that you need to know about the handling of this aircraft:

I think it's better to first set your GPS present position in the FMS and then go to the pedestal and set your IRS to ALIGN and NAV. It shouldn't fail.

 

14 minutes ago, edpatino said:

think it's better to first set your GPS present position in the FMS and then go to the pedestal and set your IRS to ALIGN and NAV. It shouldn't fail.

But, you said you can align two ways, correct?

"Seems to work in both ways for me, no matter the order between the IRS ALIGN/NAV and INSERT PRESENT POSITION actions."

The two ways is what I need to know. Then I can test both of your steps sequences.

I do not need a video that is not from FlightFX.

Is the checklist example in my first post in this topic the checklist you are using?

If not can you post a screenshot (or copy / paste here) showing what you are using for IRS alignment?

Edited July 27, 2025Jul 27 by vonmar

11 minutes ago, vonmar said:

But, you said you can align two ways, correct?

Yes, I think so, but, anyway, use the order suggested in the video, it's made by a real world pilot. Not a big issue.

17 minutes ago, edpatino said:

Yes, I think so, but, anyway, use the order suggested in the video, it's made by a real world pilot. Not a big issue.

Ok, so now it is "I think so".

This topic is only about the FlightFX checklist and their tutorial video for their CitationX IRS alignment as in my first post.

Anyway, are you able to verify your two procedures / steps for IRS alignment?

I would like to test both.

Edited July 27, 2025Jul 27 by vonmar

I thought this thread was going to be about the Infernal Revenue Service.  What a disappointment!

I don't have the 750, but all IRS / INS systems work similarly enough.  The order in which you switch the IRS to align and provide a present position is not important.  Looks like we had someone familiar with the specific airplane confirm that on page one, in fact.  If that's having an impact it's something the dev could take a look at.

On 7/28/2025 at 5:25 PM, Stearmandriver said:

I don't have the 750, but all IRS / INS systems work similarly enough.  The order in which you switch the IRS to align and provide a present position is not important.  Looks like we had someone familiar with the specific airplane confirm that on page one, in fact.  If that's having an impact it's something the dev could take a look at.

Thanks for the additional information.

Hey folks, got a question here:

Yesterday mid-flight with my Citation X I have accidently switched the LOAD SHED O'RIDE switch control to EMER position, which turned off my avionics. After returning this switch to NORM, I got FD fail and HDG fail and found no way ho to realign my IRS mid flight. Any idea how to solve such situation? Seems like some sort of a bug to me, I kinda refuse to believe that IRL accidently touching one button would basically switch you to mayday mayday mayday mode.

16 minutes ago, TyHovne said:

Hey folks, got a question here:

Yesterday mid-flight with my Citation X I have accidently switched the LOAD SHED O'RIDE switch control to EMER position, which turned off my avionics. After returning this switch to NORM, I got FD fail and HDG fail and found no way ho to realign my IRS mid flight. Any idea how to solve such situation? Seems like some sort of a bug to me, I kinda refuse to believe that IRL accidently touching one button would basically switch you to mayday mayday mayday mode.

IRS aligns while on the ground.

24 minutes ago, TyHovne said:

Hey folks, got a question here:

Yesterday mid-flight with my Citation X I have accidently switched the LOAD SHED O'RIDE switch control to EMER position, which turned off my avionics. After returning this switch to NORM, I got FD fail and HDG fail and found no way ho to realign my IRS mid flight. Any idea how to solve such situation? Seems like some sort of a bug to me, I kinda refuse to believe that IRL accidently touching one button would basically switch you to mayday mayday mayday mode.

If this is a full INS system (I'm not familiar with the 750), there will be a way to align for attitude and heading in flight, but yes, you'll have lost position information.  Using the 737 as an example, there is a "nav" position for the knobs that's used on the ground per normal procedures (which involves moving through the "align" position to start the process), and also an "Att" position that is used in flight at the direction of the QRH to regain heading information.

42 minutes ago, Stearmandriver said:

If this is a full INS system (I'm not familiar with the 750), there will be a way to align for attitude and heading in flight, but yes, you'll have lost position information.  Using the 737 as an example, there is a "nav" position for the knobs that's used on the ground per normal procedures (which involves moving through the "align" position to start the process), and also an "Att" position that is used in flight at the direction of the QRH to regain heading information.

 

So it is lost permanently and there is no way to fix it mid flight? I mean to the standard state? Only limited heading information, using the ATT position? Will I get autopilot working agian in NAV/VNAV this way?

 

55 minutes ago, vonmar said:

IRS aligns while on the ground.

 

I know that, but that's not helpful to me. I was at 40 000 feet when my avionics turned off and on again resulting in HDG fail and FD fail, as I described in my OP.

59 minutes ago, TyHovne said:

 

So it is lost permanently and there is no way to fix it mid flight? I mean to the standard state? Only limited heading information, using the ATT position? Will I get autopilot working agian in NAV/VNAV this way?

 

 

I know that, but that's not helpful to me. I was at 40 000 feet when my avionics turned off and on again resulting in HDG fail and FD fail, as I described in my OP.

As far as I know this Cessna CitationX does not cover failures / recovery.

Got to have ATC get you landed.

Note:

LOAD SHED O'RIDE to the O'ride position should get the displays back (just powered up).

Edited August 6, 2025Aug 6 by vonmar

5 minutes ago, vonmar said:

As far as I know this Cessna CitationX does not cover failures / recovery.

Got to have ATC get you landed.

Note:

LOAD SHED O'RIDE to the O'ride position should get the displays back.

Yeah, I got displays back pretty quickly, but couldn't ge trid of HDG fail & FD fail, therefore no AP.

31 minutes ago, TyHovne said:

Yeah, I got displays back pretty quickly, but couldn't ge trid of HDG fail & FD fail, therefore no AP.

Correct, you would need MCDU POS init set / IRS align.

Citation Tutor video IRS alignment.

About 20 minutes into the video.


https://youtu.be/Uer2j267z08

7 hours ago, TyHovne said:

So it is lost permanently and there is no way to fix it mid flight? I mean to the standard state? Only limited heading information, using the ATT position? Will I get autopilot working agian in NAV/VNAV this way?

Heading and attitude information, and of course radio navigation will work fine, so unless you're oceanic it's no big deal.  If you are oceanic you can probably still pull GPS position from the FMC somewhere and plot yourself to within range of navaids.  It's really not the enormous crisis some simmers (and newer pilots) think it is, to lose the boxes.