INS degrade

[kenb]

Not sure if anyone else is having this issue, when I do a cold start and run through all the check lists for start up of the INS alignment and radar warm up I automatically will get an INS degrade warning even though I allow the INS to run its alignment in both CV and GRD mode and then when the map pops up I place it in NAV mode the INS degrade warning does not go away. I have to launch with the degrade and when i launch i have to reset the caution button. this only happens when I start up cold. I have ran bit checks and checked circuit breakers but can not figure out why I'm getting this caution. The system works fine in the air. Any suggestions....

 

R,

 

Ken B

 

 

[Harker]

Regardless if you're using GPS or not, you're supposed to wait until the alignment status shows 0.5 OK before you turn the knob to either NAV (without GPS) or IFA (with GPS). The map showing is not a good criterion.

[5e EVC Chappy]

Not sure if anyone else is having this issue, when I do a cold start and run through all the check lists for start up of the INS alignment and radar warm up I automatically will get an INS degrade warning even though I allow the INS to run its alignment in both CV and GRD mode and then when the map pops up I place it in NAV mode the INS degrade warning does not go away. I have to launch with the degrade and when i launch i have to reset the caution button. this only happens when I start up cold. I have ran bit checks and checked circuit breakers but can not figure out why I'm getting this caution. The system works fine in the air. Any suggestions....

 

R,

 

Ken B

 

 

This is perfectly normal behaviour, it will disapear once the alignment is complete. You have to wait until the alignment status shows 0.5 OK to place it on NAV or IFA. Should takes about 8:15 minutes.

Alternatively you can enable the STD HGD (stored heading) in the MPCD so it will tell the jet to use the las known heading when it was shut down (assuming it was not towed since). It should take about 1:30 minutes.

 

[pete_auau]

also dont release the brakes before the ins gets aligned

[Machalot]

Regardless if you're using GPS or not, you're supposed to wait until the alignment status shows 0.5 OK before you turn the knob to either NAV (without GPS) or IFA (with GPS). The map showing is not a good criterion.

For comparison, n the Viper, normal op mode is NAV. Selecting IFA mode clears the navigation solution and reinitializes it, and after the IFA is complete you switch back to NAV, which presumably includes GPS navigation.

 

It surprises me to read that the Hornet would normally fly around in IFA mode. I see Chuck's Guide says this on page 81, but I couldn't find it in the Early Access Guide in a few minutes of searching. It seems strange that the Hornet's NAV mode would exclude GPS and that IFA mode would actually be the normal navigation mode.

[chaos]

It surprises me to read that the Hornet would normally fly around in IFA mode. I see Chuck's Guide says this on page 81, but I couldn't find it in the Early Access Guide in a few minutes of searching. It seems strange that the Hornet's NAV mode would exclude GPS and that IFA mode would actually be the normal navigation mode.

 

According to my F-18 guide (Chuck's-) it says to place it in NAV after alignment (page 72 step 54). Inflight Alignment is only done after something has seriously gone wrong and you need to bring the jet back home. From what little I know, the GPS continually updates the calculated position by the INS. It should be possible to do a "Manual Position Update" in case GPS is offline but I'd have to dive deeper into my docs. However, this should not be confused with "Inflight Alignment"...

[imacken]

 

According to my F-18 guide (Chuck's-) it says to place it in NAV after alignment (page 72 step 54). Inflight Alignment is only done after something has seriously gone wrong and you need to bring the jet back home. From what little I know, the GPS continually updates the calculated position by the INS. It should be possible to do a "Manual Position Update" in case GPS is offline but I'd have to dive deeper into my docs. However, this should not be confused with "Inflight Alignment"...

 

A couple of things. You have an outdated version of Chuck's Guide, I think See attachment. also, have you seen this INS improvements in the 19 Aug 2020 Open Beta - ED Forums (eagle.ru)

[chaos]

 

A couple of things. You have an outdated version of Chuck's Guide...[/url]

 

I stand corrected!

 

I'll update my guide and thanks for referencing the other thread on the forum. It's a slightly different story after alignment is complete... Apparently you can use either option (IFA or NAV) if GPS is available. The option is yours. However, NAV is the default and should normally be used. At least that's what I gather from sources...

[Harker]

NAV is not the default. If you have GPS available, you should use IFA. You'll get an advisory otherwise, letting you know that you have GPS and not using it.

 

As for referencing documents, Chuck's guide follows the development of the Hornet and is not updated every single day, Chuck is just one guy. Treat that guide as a valuable helper for the DCS Hornet, not an official document. If you want to reference documents, the (publicly available) NATOPS NFM-000 is the way to go.

 

Now, should the Early Access manual be updated with every new feature as it releases? IMO yes, but that's another story.

Edited November 21, 2020 by Harker

[imacken]

The point is though, that Chuck’s Guide has been updated quite a lot since the version that he was quoting from. The current version is correct.

[kenb]

thanks all for the help. I followed everyone's advise and this issue is fixed, Now if only I could adjust my shading with my reverb G1 VR headset. I cant land unless im using my NVG;s and a lot of luck. I have reduced my gamma but that didn't help. I didn't have this issue with my other NVG headset. As it stands now I can fly night missions unless I'm using my NVGS from take off to landing...

[Harker]

The point is though, that Chuck’s Guide has been updated quite a lot since the version that he was quoting from. The current version is correct.

 

Sure, but if this question was asked on the day that feature was introduced, the latest version of the guide wouldn't cover it, that's all I'm saying. While by using the actual NATOPS manual, you can't go wrong and you can actually learn about things beforehand.

[imacken]

But it wasn’t, it was asked today. I don’t see your point, sorry.

[Harker]

But it wasn’t, it was asked today. I don’t see your point, sorry.

My point is not about this question, it's just a general point. If anyone is going to reference something, they should reference official documents, if the latter are available. Anything else has the potential to confuse, at least IMO. Anyway, this is quite OT, so I'll drop it here.:) Edited November 22, 2020 by Harker

[Machalot]

NAV is not the default. If you have GPS available, you should use IFA. You'll get an advisory otherwise, letting you know that you have GPS and not using it.

...

If you want to reference documents, the (publicly available) NATOPS NFM-000 is the way to go.

That is in fact what the NATOPS NFM-000 says. The IFA switch position actually puts the system in AINS mode -- Aided Inertial Navigation System -- which incorporates GPS measurements. Strange choice of conops if you ask me, but nobody did ask me. :music_whistling:

 

[imacken]

My point is not about this question, it's just a general point. If anyone is going to reference something, they should reference official documents, if the latter are available. Anything else has the potential to confuse, at least IMO. Anyway, this is quite OT, so I'll drop it here.:)

In my experience, the official documents are updated a lot less regularly than Chuck’s guides.