Unstable approach — N509DD

N509DD (AIR Services II) was operating from KTTD to KSFF on 2026-08-20. SkyMeter detected a low approach-stability score at Felts Field (KSFF) on runway 4R at 19:39 UTC. Trace data at the event: 3017 ft AGL, 139 kt GS. Approach stability score: 44/100. 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 3 kt wind, 2 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.

• HAZARDS6/2696 2026-08-06 19:30Z – 2026-08-21 03:00Z SFC–9,000 ft

  24NM NE VANCOUVER, WA, Thursday, August 6, 2026 through Friday, August 21, 2026 UTC

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• HAZARDS6/2750 2026-08-07 00:45Z – 2026-08-22 03:00Z SFC–10,000 ft

  17NM NW CLE ELUM, WA, Friday, August 7, 2026 through Saturday, August 22, 2026 UTC

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• HAZARDS6/2776 2026-08-07 15:00Z – 2026-08-21 07:00Z SFC–7,000 ft

  4NM W SPOKANE, WA, Friday, August 7, 2026 through Friday, August 21, 2026 UTC

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• HAZARDS6/2901 2026-08-08 00:45Z – 2026-08-21 05:00Z SFC–10,000 ft

  37NM SE TACOMA, WA, Saturday, August 8, 2026 through Friday, August 21, 2026 UTC

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• HAZARDS6/2924 2026-08-08 05:00Z – 2026-08-22 05:00Z SFC–9,000 ft

  24NM NE VANCOUVER, WA, Saturday, August 8, 2026 through Saturday, August 22, 2026 UTC

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• HAZARDS6/3099 2026-08-09 02:45Z – 2026-08-23 05:00Z SFC–13,500 ft

  26NM NW LEAVENWORTH, WA, Sunday, August 9, 2026 through Sunday, August 23, 2026 UTC

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• HAZARDS6/3105 2026-08-09 05:00Z – 2026-08-24 04:00Z SFC–10,000 ft

  17NM NW CLE ELUM, WA, Sunday, August 9, 2026 through Monday, August 24, 2026 UTC

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• HAZARDS6/3163 2026-08-10 15:00Z – 2026-08-24 07:00Z SFC–7,000 ft

  4NM W SPOKANE, WA, Monday, August 10, 2026 through Monday, August 24, 2026 UTC

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• HAZARDS6/4102 2026-08-12 14:00Z – 2026-08-27 04:00Z SFC–10,000 ft

  17NM NW CLE ELUM, WA, Wednesday, August 12, 2026 through Thursday, August 27, 2026 UTC

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• HAZARDS6/4112 2026-08-12 14:00Z – 2026-08-27 04:00Z SFC–10,000 ft

  17NM NW CLE ELUM, WA, Wednesday, August 12, 2026 through Thursday, August 27, 2026 UTC

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• HAZARDS6/4585 2026-08-12 22:00Z – 2026-08-27 04:00Z SFC–9,500 ft

  38NM N THE DALLES, OR, Wednesday, August 12, 2026 through Thursday, August 27, 2026 UTC

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• HAZARDS6/4725 2026-08-13 14:00Z – 2026-08-27 07:00Z SFC–9,000 ft

  24NM E PENDLETON, OR, Thursday, August 13, 2026 through Thursday, August 27, 2026 UTC

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• HAZARDS6/4911 2026-08-13 15:00Z – 2026-08-28 04:00Z SFC–7,500 ft

  10NM W LEWISTON, ID, Thursday, August 13, 2026 through Friday, August 28, 2026 UTC

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• HAZARDS6/4722 2026-08-13 15:00Z – 2026-08-27 04:00Z SFC–9,000 ft

  39NM NE PENDLETON, OR, Thursday, August 13, 2026 through Thursday, August 27, 2026 UTC

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• HAZARDS6/5135 2026-08-14 18:00Z – 2026-08-29 04:00Z SFC–13,500 ft

  26NM NW LEAVENWORTH, WA, Friday, August 14, 2026 through Saturday, August 29, 2026 UTC

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• HAZARDS6/5941 2026-08-18 04:00Z – 2026-08-31 04:00Z SFC–13,500 ft

  26NM NW LEAVENWORTH, WA, Tuesday, August 18, 2026 through Monday, August 31, 2026 UTC

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• HAZARDS6/6726 2026-08-20 03:15Z – 2026-09-03 04:00Z SFC–9,000 ft

  25NM E PENDLETON, OR, Thursday, August 20, 2026 through Thursday, September 3, 2026 UTC

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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.

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