Return to field — N521TM

KHIO · 31L

2026-09-04 00:00 UTC· KHIO → KHIO· IDAHO POWER COMPANY· C550

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N521TM (Idaho Power) had departed KHIO on 2026-09-04. SkyMeter detected a return to field at Portland Hillsboro Airport (KHIO) on runway 31L at 00:00 UTC. Peak cruise altitude FL294, turnaround area near Aumsville, US. Approach stability score: 34/100. Scores below 50 occur on under 10% of approaches at this runway and indicate the v2 scorer flagged the approach as highly anomalous (three or more gates exceeded the runway's P90 envelope simultaneously). METAR at the time reported 0 kt wind, 16,093 m visibility. Detection algorithm and known limitations: see SkyMeter methodology.

Pilot review data

  • Runway 31L
  • 29423 ft AGL at event
  • 403 kt ground speed
  • 0 fpm vertical
  • Approach stability 34/100
  • 0 kt wind
  • 0 kt crosswind component
  • 16,093 m visibility
  • KHIO 161753Z 03008KT 10SM CLR 22/10 A3009 RMK AO2 SLP189 T02170100 10217 20078 58002

Flight context

  • N521TM
  • Idaho Power
  • C550
  • KHIO → KHIO
  • 2026-09-04 00:00 UTC
  • KHIO runway 31L

All events on this flight

Return to field 00:00:09 UTC · KHIO runway 31L · 29,423 ft AGL · 403 kt GS
Unstable approach 00:18:17 UTC · KHIO runway 13R · 1,280 ft AGL · 156 kt GS

Automated analysis. Events shown on this page (such as go-around, unstable approach, or runway events) are heuristic classifications produced by algorithms from publicly broadcast ADS-B data. They are intended to surface flights of interest for further review — they are not findings of fact, and they do not determine pilot fault, regulatory compliance, or the cause of any occurrence. Coverage gaps and sensor noise can affect accuracy. Only the relevant civil aviation authority or accident investigation body can make official determinations. How we detect events · Dispute or correct this data

SkyMeter · trace data observed via ADS-B· KHIO