Unstable approach — ASA520

ASA520 (Alaska Airlines) was operating from KSEA to K8T8 on 2026-06-11. SkyMeter detected a low approach-stability score at San Geronimo Airpark (K8T8) on runway 17L at 09:51 UTC. Trace data at the event: 2139 ft AGL, 154 kt GS. Approach stability score: 40/100. 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 6 kt wind. 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.

• SECURITY6/0092 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

  CALEXICO, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

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• SECURITY6/0091 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

  Coyote Wells, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

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• SECURITY6/4165 2026-02-14 07:00Z – 2026-08-15 06:59Z SFC–400 ft

  Nogales, AZ, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• SECURITY6/4160 2026-02-14 08:00Z – 2026-08-15 06:59Z SFC–400 ft

  Chula Vista, CA, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• SECURITY6/4240 2026-03-08 08:00Z – 2026-11-01 07:00Z SFC–180 ft

  SAN ANGELO, TX, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local

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• SECURITY6/3475 2026-03-08 09:00Z – 2026-11-01 09:59Z SFC–180 ft

  BEALE AFB, CA, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local

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• SECURITY6/5797 2026-04-03 00:01Z – 2026-09-28 23:59Z SFC–400 ft

  SACRAMENTO, CA, Thursday, April 2, 2026 through Monday, September 28, 2026 Local

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• HAZARDS6/2830 2026-05-25 15:45Z – 2026-06-11 16:00Z SFC–5,000 ft

  GARDEN GROVE, CA, Monday, May 25, 2026 through Thursday, June 11, 2026 UTC

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• HAZARDS6/3908 2026-05-29 14:00Z – 2026-06-12 04:00Z SFC–9,000 ft

  23NM SE GLENDIVE, MT, Friday, May 29, 2026 through Friday, June 12, 2026 UTC

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• HAZARDS6/4403 2026-05-31 14:00Z – 2026-06-14 04:00Z SFC–11,000 ft

  18NM NE TUCSON, AZ, Sunday, May 31, 2026 through Sunday, June 14, 2026 UTC

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• HAZARDS6/4313 2026-05-31 14:00Z – 2026-06-14 03:00Z SFC–8,000 ft

  13NM NW CARLSBAD, NM, Sunday, May 31, 2026 through Sunday, June 14, 2026 UTC

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• SECURITY6/4158 2026-06-01 06:00Z – 2026-07-21 05:59Z SFC–400 ft

  MERIDIAN, ID, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4167 2026-06-01 06:00Z – 2026-07-21 05:59Z SFC–400 ft

  Salt Lake City, UT, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4164 2026-06-01 06:00Z – 2026-07-21 05:59Z SFC–400 ft

  Sandy, UT, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4192 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Santa Barbara, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/3948 2026-06-01 07:00Z – 2026-07-21 06:59Z

  MESA, AZ, Monday, June 1, 2026 through Tuesday, July 21, 2026 UTC

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• SECURITY6/4060 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Oakland, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4054 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  San Jose, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4052 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  San Jose, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• 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

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• 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

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• SECURITY6/4182 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Irvine, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4183 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  San Diego, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4189 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Los Angeles, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• 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

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• SECURITY6/4197 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  GOLETA, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4198 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  IRVINE, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4201 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Dana Point, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4202 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  San Diego, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4203 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  San Diego, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4204 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Santa Clara, CA, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/3966 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  Mesa, AZ, Monday, June 1, 2026 through Monday, July 20, 2026 Local

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• SECURITY6/4061 2026-06-01 07:00Z – 2026-07-21 06:59Z SFC–400 ft

  BERKLEY, CA, Monday, June 1, 2026 through Tuesday, July 21, 2026 Local

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• HAZARDS6/5756 2026-06-05 14:00Z – 2026-06-19 04:00Z SFC–11,500 ft

  3NM E NOGALES, AZ, Friday, June 5, 2026 through Friday, June 19, 2026 UTC

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• HAZARDS6/5894 2026-06-05 20:31Z – 2026-06-19 02:00Z SFC–10,000 ft

  38NM SE TWIN FALLS, ID, Friday, June 5, 2026 through Friday, June 19, 2026 UTC

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• HAZARDS6/5936 2026-06-06 03:00Z – 2026-06-19 02:00Z SFC–7,500 ft

  27NM SE TWIN FALLS, ID, Saturday, June 6, 2026 through Friday, June 19, 2026 UTC

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• HAZARDS6/6577 2026-06-08 22:46Z – 2026-06-13 04:00Z SFC–11,500 ft

  13NM W NUCLA, CO, Monday, June 8, 2026 through Saturday, June 13, 2026 UTC

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• HAZARDS6/6225 2026-06-09 14:00Z – 2026-06-21 02:00Z SFC–10,500 ft

  31NM SW NEPHI, UT, Tuesday, June 9, 2026 through Sunday, June 21, 2026 UTC

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• HAZARDS6/6581 2026-06-09 15:00Z – 2026-06-14 04:00Z SFC–10,000 ft

  25NM N CODY, WY, Tuesday, June 9, 2026 through Sunday, June 14, 2026 UTC

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• HAZARDS6/6608 2026-06-09 15:00Z – 2026-06-22 04:00Z SFC–11,500 ft

  13NM W NUCLA, CO, Tuesday, June 9, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/6827 2026-06-09 17:15Z – 2026-06-22 02:00Z SFC–10,000 ft

  9NM SW TOOELE, UT, Tuesday, June 9, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/6780 2026-06-10 13:00Z – 2026-06-22 04:00Z SFC–10,000 ft

  14NM E FLAGSTAFF, AZ, Wednesday, June 10, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/6965 2026-06-10 14:00Z – 2026-06-22 03:00Z SFC–10,000 ft

  9NM SW TOOELE, UT, Wednesday, June 10, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/7402 2026-06-10 20:57Z – 2026-06-23 04:00Z SFC–8,500 ft

  34NM NE TRINIDAD, CO, Wednesday, June 10, 2026 through Tuesday, June 23, 2026 UTC

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• HAZARDS6/7478 2026-06-11 03:12Z – 2026-06-24 04:00Z SFC–11,500 ft

  20NM N NUCLA, CO, Thursday, June 11, 2026 through Wednesday, June 24, 2026 UTC

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• HAZARDS6/7479 2026-06-11 03:19Z – 2026-06-24 04:00Z SFC–11,500 ft

  10NM NW NUCLA, CO, Thursday, June 11, 2026 through Wednesday, June 24, 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.

All events on this flight

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