Unstable approach — N509DD

KTTD · 07

2026-07-17 16:07 UTC· KSFF → KTTD· AIR SERVICES II LLC· E55P

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N509DD (AIR Services II) was operating from KSFF to KTTD on 2026-07-17. SkyMeter detected a low approach-stability score at Portland Troutdale Airport (KTTD) on runway 07 at 16:07 UTC. Trace data at the event: 1108 ft AGL, 119 kt GS. Approach stability score: 41/100. 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 4 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)
  • SECURITY6/4011 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    BELLEVUE, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4013 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    Seattle, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4024 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    Spokane, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4032 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    Airway Heights, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4033 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    RENTON, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4034 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

    Renton, WA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

    View FAA NOTAM →
  • HAZARDS6/2989 2026-07-05 17:35Z – 2026-07-20 05:00Z SFC–7,000 ft

    15NM E PENDLETON, OR, Sunday, July 5, 2026 through Monday, July 20, 2026 UTC

    View FAA NOTAM →
  • HAZARDS6/3022 2026-07-06 14:00Z – 2026-07-20 05:00Z SFC–8,000 ft

    15NM E PENDLETON, OR, Monday, July 6, 2026 through Monday, July 20, 2026 UTC

    View FAA NOTAM →
  • SECURITY6/8078 2026-07-07 16:07Z – 2026-07-21 06:59Z SFC–400 ft

    Airway Heights, WA

    View FAA NOTAM →
  • SECURITY6/8079 2026-07-07 16:07Z – 2026-07-21 06:59Z SFC–400 ft

    Spokane, WA

    View FAA NOTAM →
  • HAZARDS6/4954 2026-07-11 20:52Z – 2026-07-19 05:00Z SFC–8,500 ft

    7NM S WENATCHEE, WA, Saturday, July 11, 2026 through Sunday, July 19, 2026 UTC

    View FAA NOTAM →
  • SECURITY6/8073 2026-07-12 17:07Z – 2026-07-21 06:59Z SFC–400 ft

    Renton, WA

    View FAA NOTAM →
  • SECURITY6/8074 2026-07-12 17:07Z – 2026-07-21 06:59Z SFC–400 ft

    Renton, WA

    View FAA NOTAM →
  • SECURITY6/8080 2026-07-12 17:07Z – 2026-07-21 06:59Z SFC–400 ft

    Seattle, WA

    View FAA NOTAM →
  • SECURITY6/8081 2026-07-12 17:07Z – 2026-07-21 06:59Z SFC–400 ft

    Bellevue, WA

    View FAA NOTAM →
  • HAZARDS6/6314 2026-07-16 21:42Z – 2026-07-31 04:00Z SFC–8,500 ft

    12NM NW CLE ELUM, WA, Thursday, July 16, 2026 through Friday, July 31, 2026 UTC

    View FAA NOTAM →
  • HAZARDS6/6401 2026-07-17 04:01Z – 2026-07-31 04:00Z SFC–8,500 ft

    12NM NW CLE ELUM, WA, Friday, July 17, 2026 through Friday, July 31, 2026 UTC

    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 07
  • 1108 ft AGL at event
  • 119 kt ground speed
  • 0 fpm vertical
  • Approach stability 41/100
  • 4 kt wind
  • 3 kt crosswind component
  • 16,093 m visibility
  • KTTD 152053Z VRB03KT 10SM BKN023 OVC028 20/14 A3014 RMK AO2 SLP206 T02000139 58000

Flight context

  • N509DD
  • AIR Services II
  • E55P
  • KSFF → KTTD
  • 2026-07-17 16:07 UTC
  • KTTD runway 07

All events on this flight

Unstable approach 16:07:34 UTC · KTTD runway 07 · 1,108 ft AGL · 119 kt GS
Unstable approach 16:07:34 UTC · KTTD runway 07 · 1,108 ft AGL · 119 kt GS
Unstable approach 16:07:34 UTC · KTTD runway 07 · 1,108 ft AGL · 119 kt GS
Unstable approach 16:07:34 UTC · KTTD runway 07 · 1,108 ft AGL · 119 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· KTTD