Unstable approach — N260TT

KBIS · 13

2026-08-11 20:37 UTC· KBJC → KBIS· TRI-STATE GENERATION & TRANSMISSION ASSOCIATION· B350

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N260TT (Tri-State Generation & Transmission Association) was operating from KBJC to KBIS on 2026-08-11. SkyMeter detected a low approach-stability score at Bismarck Municipal Airport (KBIS) on runway 13 at 20:37 UTC. Trace data at the event: 2732 ft AGL, 146 kt GS. METAR at the time reported 3 kt wind, 3 kt crosswind component, 16,093 m visibility. The approach-stability score rates the final approach against stabilized-approach gates (glideslope, lateral deviation, descent rate, and IAS) at defined altitudes. A low score means one or more of those were outside the normal envelope for how the approach was flown. The score is graded by guidance type, so instrument approaches (ILS or an aligned straight-in) are held to the full gate set, while visual and pattern arrivals are surfaced only when the score is clearly low. The score is advisory and observational, a deviation measure, not an assertion of an accident. Detection algorithm and known limitations: see SkyMeter methodology.

Active FAA TFR during this flight

Source: FAA TFR archive (hourly snapshot)
  • HAZARDS6/9880 2026-07-29 14:00Z – 2026-08-12 03:00Z SFC–9,000 ft

    26NM E MILES CITY, MT, Wednesday, July 29, 2026 through Wednesday, August 12, 2026 UTC

    View FAA NOTAM →
  • SECURITY6/1983 2026-08-07 06:01Z – 2026-08-17 05:59Z SFC–400 ft

    Sturgis, SD, Friday, August 7, 2026 through Sunday, August 16, 2026 Local

    View FAA NOTAM →

SkyMeter cross-referenced this flight against FAA-published TFRs that were active during its window and within its geographic bounding box. Overlap doesn't necessarily mean violation — the aircraft may have been outside the TFR’s precise polygon or flying under air-traffic-control coordination.

Pilot review data

  • Runway 13
  • 2732 ft AGL at event
  • 146 kt ground speed
  • 0 fpm vertical
  • 3 kt wind
  • 3 kt crosswind component
  • 16,093 m visibility
  • KBIS 161752Z 14010KT 10SM OVC090 17/11 A3023 RMK AO2 RAE11 SLP245 P0000 60000 T01720106 10172 20056 58001

Flight context

  • N260TT
  • Tri-State Generation & Transmission Association
  • B350
  • KBJC → KBIS
  • 2026-08-11 20:37 UTC
  • KBIS runway 13

All events on this flight

Unstable approach 20:37:29 UTC · KBIS runway 13 · 2,732 ft AGL · 146 kt GS
Unstable approach 20:37:29 UTC · KBIS runway 13 · 2,732 ft AGL · 146 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· KBIS