Something every F-14 crew MUST know (CV & INS).

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Raid
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Joined: Mon Sep 23, 2019 5:16 pm

Something every F-14 crew MUST know (CV & INS).

Post by Raid » Tue Aug 09, 2022 12:44 pm

Hey guys this is something I found.



Carrier. Big carrier. A lot of metal. The carrier causes some parts of the avionics to go nuts, namely the ones that should indicate the aircraft's direction.
Screen Shot 2022-08-09 at 11.43.53 AM.png
Screen Shot 2022-08-09 at 11.43.53 AM.png (1.19 MiB) Viewed 1419 times

This causes issues to non-INS navigation (DR & pilotage, Aerodrome charts, specific instructions, etc) and, especially, Air-to-Air (Bearings off by 20° don't sound like a lot of fun). Until recently, the only fix was flying straight and unaccelerated (even non-continuously) until the AHRS re-synchronised. The ratio was ~9°/minute. This is why many never noticed the problem, but sometimes this is not a sufficient workaround (especially if you YOLO from the catapult).
The dedicated function (HDG Pushbutton in the compass control panel—front seat) was bugged in certain scenarios. Now HB devs sorted it out, and in a matter of a few seconds the issue is sorted!

So, since this issue affects every single F-14 departing from a carrier, I decided to make a short video and spread the word. The fix is easy, takes 5" and can really change your effectiveness.
I suppose it also impacts every aircraft, perhaps besides the most recent ones (maybe the F/A-18C has a function to sort itself out?).
After a conversation with a couple of RIOs and A-6E B/N, the HDG Pushbutton (or equivalent function) was part of the SOP.

Video: https://www.youtube.com/watch?v=St-OEWw40q0

Related Article: https://flyandwire.com/2022/08/09/must- ... 92-bugfix/

AN/ASN-92 INS study (Part III - CV ops): https://flyandwire.com/2022/04/06/an-an ... perations/

I hope you find this useful.