Bearing pointers anomalous 1 & 2 behavior (?)

[mooshim]

IIRC in on the way to runway fix in ILS mode.... It occasionally happens on way to waypoint...

 

Suddenly they both, in unison (i.e. 1 on top of 2) shift--as if suddenly tugged-- for a brief moment to something significant, then they shift back to their original direction.

 

Is there a reason for this?

 

In neither case am I in TACAN mode.

 

would appreciate a heads-up.

 

It would really help me to get to understand the HSI better.

 

Thanks.

 

Moosh

[Scabbers]

can you post a track for us to use to investigate this