Airport information
- FAA LID
- 31D
- Coordinates
- 40.3312, -79.7802
- Elevation
- 1,250 ft MSL
- Magnetic variation
- 8W
- Sectional chart
- DETROIT
- Airport use
- Public
- Control tower
- No
- ARTCC
- CLEVELAND (ZOB)
- Flight service (FSS)
- ALTOONA · 1-800-WX-BRIEF
- NOTAM facility
- AOO
- Attendance
- IREG
- Segmented circle
- No
- Wind indicator
- yes
- Activated
- 1948/11
- Distance from city
- 4 W
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-21
| Event | Local (EDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:16 AM | 09:16Z |
| Sunrise | 05:49 AM | 09:49Z |
| Sunset | 08:52 PM | 00:52Z |
| Evening civil twilight Loggable night begins | 09:26 PM | 01:26Z |
Plan a flight from 31D
Night operations
- Pilot-controlled lighting
- Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement ↗
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.
Traffic pattern
- Landing
- Rwy E
- Pattern
- left (turns left)
- TPA
- 2,300 ft MSL (≈1,000 AGL)
- CTAF
- 122.9
Enter the left downwind for Rwy E at 2,300 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway E/W
1,800 ft × 120 ft · Turf (Fair)- Heading
- n/a
- Markings
- nonstandard
- Traffic pattern
- Left
- Approach obstacle
- Trees, 73 ft, 299 ft from threshold, 139 ft R of centerline — 4:1 slope to clear · penetrates the 20:1 visual approach surface
- Heading
- n/a
- Markings
- nonstandard
- Traffic pattern
- Left
- Approach obstacle
- Trees, 40 ft, 13 ft from threshold, 116 ft L of centerline
| Runway | Length | Your margin |
|---|---|---|
| E/W | 1,800 ft |
Communication frequencies
Tower & ground
| CTAF | 122.9 |
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| AGC · Allegheny | VOR-DME | 110.00 | r084° / 12.3 NM |
| MMJ · Montour | VORTAC | 112.00 | r124° / 21.1 NM |
| IHD · Indian Head | VORTAC | 108.20 | r324° / 28.9 NM |
| EWC · Ellwood City | VORTAC | 115.80 | r154° / 35.6 NM |
| HLG · Wheeling | VOR-DME | 112.20 | r090° / 36.4 NM |
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Parking
- tiedowns
Ownership & management
Remarks FAA
- VFR OPNS ONLY
- MARKED WATER TANK APRXLY NINE TENTHS OF A MI EAST OF ARPT, UNMARKED CELL TOWER NEAR WATER TANK & MARKED TRANSMISSION LINE APRXLY 1460 FT EAST OF ARPT.
- ULTRALIGHT ACTIVITY ON & INVOF ARPT.
- DEER ON AND IN VICINITY OF AIRPORT.
- TURF RUNWAY MAY BE SOFT DURING SPRING THAW AND WET PERIODS. CALL FOR CURRENT RUNWAY CONDITIONS.
- FENCE APRXLY 4 FT HIGH ALONG SOUTH SIDE OF RY "W" AND EXTDS APRXLY 500 FT INTO THE APRCH SURFACE.
- RWY E/W 275 FT UNMARKED SAFETY AREA WEST END; 225 FT UNMARKED SAFETY AREA EAST END .
- RWY E/W WIDTH VARIES 118-178 FT.
- FOR CD CTC PITTSBURGH APCH AT 412-472-5591
- TIE DOWN ROPES ARE NOT SUPPLIED.
- AIRPORT MANAGER ALTERNATE NUMBER 724-989-6560
- DOGLEG IN RY APRXLY 15 DEGS.
- RY E/W 235 FT UNMKD SAFETY AREA WEST END; 281 FT UNMKD SAFETY AREA EAST END.
- RY E/W WIDTH VARIES 120-275 FT.
- RY E MKD WITH YELLOW CONES.
- RY W MKD WITH YELLOW CONES.
- CTLNG OBSTN EXCEEDS A 45 DEG SLP.
Nearby airports
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 31D 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.
About 31D
Inter County Airport (31D) is an airport in Irwin, PA, at 1,250 ft MSL. It has 1 runway, the longest 1,800 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 31D, refreshed from the Aviation Weather Center and FAA NASR.
Does 31D have a control tower?
No. Inter County Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at 31D?
Inter County Airport has 1 runway; the longest is 1,800 ft. See the Runways tab for headings, surface, and lighting.
Where is 31D?
Inter County Airport is in Irwin, PA, at an elevation of 1,250 ft MSL. Coordinates: 40.3312, -79.7802.
Fly out of 31D often?
Save 31D 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.