PCJ20 was operating from KNUQ to KAPC on 2026-05-21. SkyMeter detected a low approach-stability score at Napa County Airport (KAPC) on runway 18R at 00:45 UTC. Trace data at the event: 1147 ft AGL, 129 kt GS. Approach stability score: 43/100. 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 8 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)- SECURITY6/0758 2026-05-18 07:01Z – 2026-05-31 06:59Z SFC–1,499 ft
Concord, CA, Monday, May 18, 2026 through Saturday, May 30, 2026 Local
View FAA NOTAM → - SECURITY6/0837 2026-05-19 15:30Z – 2026-05-21 19:00Z SFC–400 ft
Mountain View, CA, Tuesday, May 19, 2026 through Thursday, May 21, 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 18R
- 1147 ft AGL at event
- 129 kt ground speed
- 0 fpm vertical
- Approach stability 43/100
- 8 kt wind
- 3 kt crosswind component
- 16,093 m visibility
- METAR KAPC 100154Z 23004KT 10SM CLR 19/13 A3010 RMK AO2 SLP184 T01890133 $
Flight context
- PCJ20
- C25B
- KNUQ → KAPC
- 2026-05-21 00:45 UTC
- KAPC runway 18R
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