Knox County Airport
4I3 · Mount Vernon, OH · Non-towered · Print kneeboard
Nearby now
Loading…
Weather
METAR observed
Loading current weather…
TAF forecast
Loading forecast…
Sun & FAA night2026-08-04 · night begins 09:12 PM
| Event | Local (EDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:00 AM | 10:00Z |
| Sunrise | 06:30 AM | 10:30Z |
| Sunset | 08:42 PM | 00:42Z |
| Evening civil twilight Loggable night begins | 09:12 PM | 01:12Z |
Plan a flight from 4I3
Winds aloft NOAA forecast · 3,000 to 53,000 ft
Loading winds aloft…
Advisories
NOTAMs
Loading NOTAMs…
Pilot reports
Loading PIREPs…
Airspace hazards
Checking advisories…
Runways
RWY 10LEFT traffic
- Heading
- 104° mag · 098° true
- Dimensions
- 5,504 × 100 ft
- TPA
- 2,000 ft MSL · 808 AGL · charted
- Surface
- Asphalt
- Lights
- 4-light PAPI (left) (3°)
- CTAF
- 123.05
Enter the left downwind (heading 284°) on the 45° at 2,000 ft MSL.
More details — RWY 10
- Threshold elev
- 1,187 ft
- Markings
- nonprecision
- Approach obstacle
- Trees, 126 ft, 3,188 ft from threshold, 60 ft L of centerline — 23:1 slope to clear
- Threshold crossing height
- 40 ft
- TDZ elevation
- 1,192 ft
- End lights
- REIL
Pattern side: FAA NASR · TPA charted (NASR) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 10/28 | 5,504 ft |
Prefer one flat page? Full runway details for 4I3 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 4I3 kneeboard →
Comms & NavAids
Communication frequencies
Before taxi
Taxi & takeoff
Departure & arrival
“Columbus”ATC assigns the exact frequency (in your clearance or on handoff) — which one depends on your SID (departing) or STAR (arriving).
By procedure & sector (1 frequencies)
| Frequency | Used by |
|---|---|
| 317.775 | APCH/P DEP/P IC |
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
APE 116.70 · BUD 109.80 · MFD 108.80
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| APE · Appleton | VORTAC | 116.70 · 114X | High | r021° / 11.1 NM |
| BUD · Buckeye | VOR | 109.80 | Terminal | r130° / 30.1 NM |
| MFD · Mansfield | TACAN | 108.80 · 25X | — | r178° / 32.6 NM |
Prefer one flat list? All 4I3 frequencies →
Charts & procedures
Airport info
Airport information
- FAA LID
- 4I3
- Coordinates
- 40.3287, -82.5238
- Elevation
- 1,192 ft MSL
- Magnetic variation
- 6W
- Sectional chart
- DETROIT
- Airport use
- Public
- Control tower
- No
- Weather station
- AWOS-3PT · 126.05 · ☎ 740-397-6297
- ARTCC
- INDIANAPOLIS (ZID)
- Flight service (FSS)
- CLEVELAND · 122.3 · 1-800-WX-BRIEF
- NOTAM facility
- 4I3
- Attendance
- MON-FRI 0700-1700; SAT-SUN 0900-1700
- Beacon
- white-green (SS-SR)
- Segmented circle
- No
- Wind indicator
- lighted
- Distance from city
- 4 SW
Night operations
- Airport lighting
- SEE RMK
- Rotating beacon
- white-green · SS-SR
- Pilot-controlled lighting
- ACTVT REIL RWY 10 & 28; MIRL RWY 10/28 - CTAF. PAPI RWY 10 & 28 OPR CONSLY. on 123.05 — Chart Supplement ↗
Runway lighting aids — 10: 4-light PAPI (left) · 28: 4-light PAPI (left).
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are under Sun & FAA night in the Weather section.
Services fuel · repairs · oxygen · attendance
- Fuel available
- 100LL, Jet A (additive)
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- MAJOR
- Powerplant service
- MAJOR
- Parking
- tiedowns, hangars
- Other services
- Agricultural, Instruction, Rental
Ownership & management 2 contacts
Remarks FAA · 5 notes
General
- DEER, BIRDS, & OTR WILDLIFE ON & INVOF ARPT.
Lighting
- ACTVT REIL RWY 10 & 28; MIRL RWY 10/28 - CTAF. PAPI RWY 10 & 28 OPR CONSLY.
Fuel
- FUEL AVBL H24 SELF SER VIA CREDIT CARD.
Contact
- KNOXAIRPORT@EMBARQMAIL.COM.
Attendance
- 24 HR PN FOR ATNDNC AFT HRS - CALL AMGR.
Nearby airports
Loading nearby conditions…
Also nearby: 6G4 Wynkoop Airport (3 NM) · 6CM Chapman Memorial Field (10 NM) · 5OI8 McKnight Airport (private) (10 NM) · OH09 One Shot Airport (private) (13 NM) · OH42 Hawk's Nest Airport (private) (14 NM) · OH56 Warped Wing Airport (private) (14 NM)
About 4I3
Knox County Airport (4I3) is an airport in Mount Vernon, OH, at 1,192 ft MSL. It has 1 runway, the longest 5,504 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 4I3, refreshed from the Aviation Weather Center and FAA NASR.
Does 4I3 have a control tower?
No. Knox County Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at 4I3?
Knox County Airport has 1 runway; the longest is 5,504 ft. See the Runways section for headings, surface, and lighting.
Where is 4I3?
Knox County Airport is in Mount Vernon, OH, at an elevation of 1,192 ft MSL. Coordinates: 40.3287, -82.5238.
Fly out of 4I3 often?
Save 4I3 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 4I3 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.