Incident at Toronto, ON (ATM - NAVAIDS/radar)
1997-11-12: Radar tag reference ACA857 disappeared between the Simcoe VOR and 15 nm NE YYZ. Transponder had changed from 2331 (assigned) to 2341. Arrival controller instructed ACA857 to select 2331. Tag reappeared. Explanation unknown. Ops. Impact -- none.
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