Inter County
31D · Irwin, PA · Non-towered · Print kneeboard · Open on the map
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Weather
METAR observed
TAF forecast
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Sun & FAA night2026-09-18 · night begins 07:51 PM
| Event | Local (EDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:35 AM | 10:35Z |
| Sunrise | 07:03 AM | 11:03Z |
| Sunset | 07:23 PM | 23:23Z |
| Evening civil twilight Loggable night begins | 07:51 PM | 23:51Z |
Plan a flight from 31D
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Full reports: nearest reporting station
Advisories
NOTAMs · Loading NOTAMs…
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Airspace hazards · Checking SIGMETs and G-AIRMETs…
Temporary flight restrictions · Checking for TFRs…
Runways
RWY ELEFT traffic
- Heading
- 090° mag · 082° true
- Dimensions
- 1,800 × 120 ft
- TPA
- 2,300 ft MSL (≈1,000 AGL) · standard
- Surface
- Turf
- CTAF
- 122.9
Enter the left downwind (heading 270°) on the 45° at 2,300 ft MSL (≈1,000 AGL).
More details — RWY E
- Markings
- nonstandard
- Approach obstacle
- Trees, 76 ft, 299 ft from threshold, 139 ft R of centerline — 3:1 slope to clear · penetrates the 20:1 visual approach surface
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: schematic (headings + lengths)
| Runway | Length | Your margin |
|---|---|---|
| E/W | 1,800 ft |
Prefer one flat page? Full runway details for 31D → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 31D kneeboard →
Comms & NavAids
Communication frequencies
Taxi & takeoff
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
AGC 110.00 · IHD 108.20 · EWC 115.80 · +1
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| AGC · Allegheny | VOR/DME | 110.00 · 37X | Low | r084° / 12.4 NM |
| IHD · Indian Head | TACAN | 108.20 · 19X | — | r324° / 28.9 NM |
| EWC · Ellwood City | VOR/DME | 115.80 · 105X | High | r154° / 35.5 NM |
| HLG · Wheeling | VOR/DME | 114.25 · 89Y | Low | r090° / 36.4 NM |
Prefer one flat list? All 31D frequencies →
Charts & procedures
Airport info
Airport information
- FAA LID
- 31D
- Coordinates
- 40.3334, -79.7792
- 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
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 under Sun & FAA night in the Weather section.
Services fuel · repairs · oxygen · attendance
- Parking
- tiedowns
Ownership & management 2 contacts
Remarks FAA · 15 notes
General
- 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
Runways
- 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.
Obstructions
- CTLNG OBSTN EXCEEDS A 45 DEG SLP.
Contact
- AIRPORT MANAGER ALTERNATE NUMBER 724-989-6560
Nearby airports
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Also nearby: 5G8 Greensburg Jeannette Regional (8 NM) · G05 Finleyville Airpark (12 NM) · 1PN7 Leukhardt's Landing (private) (15 NM) · 77PA Nardo (private) (16 NM)
About 31D
Inter County (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 is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at 31D?
Inter County has 1 runway; the longest is 1,800 ft. See the Runways section for headings, surface, and lighting.
Where is 31D?
Inter County is in Irwin, PA, at an elevation of 1,250 ft MSL. Coordinates: 40.3334, -79.7792.
More about 31D
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.
Something here wrong or out of date? Report a data problem.