F-16 stored INS does incorrect on realigning

[JeffreyC]

Though stored INS is stated as being for if the aircraft has not moved since last being aligned that does not work.

 

After landing to rearm and refuel, on starting up again if using the stored INS it loads what was at the very beginning of starting the mission not when the F-16 was shut down especially regarding heading this has been noticed. Normal alignment works properly.

 

 

To reproduce: Start a mission in the F-16 using any alignment as first time works fine in both ways. Take off then land (or possibly just turn the aircraft), shut down the aircraft (or turn off INS), restart the F-16 and select Stored for INS alignment. Aircraft heading is the original heading at the start of the mission not the heading when the F-16 was shut down. Turn INS off then reset to Normal alignment and heading is the correct present heading of the F-16.

Edited September 3, 2020 by JeffreyC

[Frederf]

Not quite. To get a stored heading you have to do a full ground alignment again after landing. Your old alignment that you flew around with isn't good enough. The full procedure to fly twice with a stored heading on the second flight is:

 

1. Start

2. Align

3. Fly

4. Land & Park

5. INS off

6. INS ground align to full

7. INS off

8. INS to stored alignment

9. Fly

[JeffreyC]

Totally disagree. This is contra the very nature of a stored heading and as stated by Wags

"You generally use a stored alignment if the aircraft hasn't moved since it was last shut down"

 

As it is, stored is not usable since last shut down, and your method makes stores alignment useless and does not coincide with what is stated as the purpose of a stored alignment.

[Frederf]

If the knob is placed into NAV after alignment then the system will flag the stored heading alignment as degraded (RDY/ALIGN never flashes). So it is impossible to fly, shutdown, and select stored heading directly on the next flight and also get a flashing RDY/ALIGN. To get a full stored heading alignment you must perform a full additional alignment after parking and go directly from NORM-OFF on the knob. Anything less won't give you what you spawned with the first time.

 

Anyway, fly-land-shutoff-stored = degraded flag. fly-land-align-shutoff-stored = no degraded flag. It is forbidden for the pilot by the rule book to use stored alignment if it wasn't prepared with a normal full align that went directly from ALIGN to OFF on the knob. What happens if you try it? Beyond never getting a flashing RDY and probably some bad INS performance probably not even non-test pilots know. It's not something they are allowed to do.

[JeffreyC]

It DOES say ready and at 10 alignment but the heading is wrong. Hence the bug report. Even with a full standard alignment prior to flight, it does NOT store as stated by Wags for the aircraft not having been moved since last shut down as stated in the link included. Your profile also does not seem you are with ED. As this is a bug report this should be the end of it pending a real response or if you do work for ED then the company does not care about bugs.

Edited September 3, 2020 by JeffreyC
Fed up.

[d0ppler]

So.. any solution? I'm experiencing the exact same problem. 1.5 years after it was reported.

[MAXsenna]

1 hour ago, d0ppler said:

So.. any solution? I'm experiencing the exact same problem. 1.5 years after it was reported.

It's not incorrect. What Wags says in the video is a little incorrect. 

Read what @Frederf writes above. Takes you 2 secs. 

Edited January 19, 2022 by MAXsenna