Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 45; Flight Crew Total 5100; Flight Crew Type 2000
Time Pressure; Situational Awareness; Distraction; Workload
Airspace Violation All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural FAR
Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Human Factors; Environment - Non Weather Related; Procedure
I was the instructor on an instrument training flight; entering a hold at SDZ VOR specifically outbound on parallel entry to the hold. Ceiling and visibility unlimited. I saw an object which appeared to be lighted at a mile or less about 50 feet or so below which appeared to be approaching us and varying it's altitude up and down. The light could have been a sun reflection.  I told the student to look up to watch the object also as we turned away from it. We queried FAY TRACON and they did not see any conflicting traffic. It did not appear on TIS (Traffic Information Services) nor on iPad ADS-B (Automatic Dependent Surveillance-Broadcast).  When we took evasive action in turning toward the VOR (continuing in the hold) we lost visual contact and never saw it again.  As a matter of note there is a known model aircraft field approximately 6 miles east of the VOR.
An instructor flying near the SDZ VOR at 3;300 feet took evasive action from a UAV which FAY TRACON did not have on radar.