Small Aircraft; Low Wing; 2 Eng; Retractable Gear
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 30; Flight Crew Total 2500; Flight Crew Type 1500
Confusion; Distraction; Human-Machine Interface; Situational Awareness
Aircraft Equipment Problem Critical; Deviation - Track / Heading All Types; Inflight Event / Encounter Weather / Turbulence
Aircraft Equipment Problem Dissipated; Flight Crew Took Evasive Action; Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach
Weather; Aircraft; ATC Equipment / Nav Facility / Buildings
While VOR outbound on approach; because of temporary instrument problems; could not establish published procedure.
The reporter stated that for many years the SEG VOR has had an unusually unstable signal within about 15 miles; which is not associated with the cone of confusion. During this particular event; the signal did not stabilize and when he realized the CDI was not going to recenter or present a usable display he broke the approach off. Usually after passing SEG he holds the inbound heading until the signal stabilizes and although the CDI may not be centered; at least it is close. Another issue for him indirectly related is that his G155XL database no longer contains VOR only approaches. It does however provide guidance for VOR/GPS approaches.
A pilot reported that he was unable to establish his aircraft outbound on the SEG VOR-A because the VOR signal outbound was unusable.