Reference only — not for real-world navigation.
IL38
J Maddock Airport · Big Rock
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
705 ft / 215 m
Transition Altitude
18,000 ft
Primary Channel
—
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
E/W · 2,600 ft · TURF-GUNLITFlight Planning
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Welcome to the technical flight briefing for J Maddock Airport (IL38), located in Big Rock, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 1 active runway with a maximum elevation of 705 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
J Maddock Airport
ICAO / IATA
IL38 / —
Municipality
Big Rock
Country
Region
US-IL — Illinois
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
705 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway E / W
UNLIT
Runway Length: 2,600 ft / 792 m
Runway Width: 70 ft / 21 m
Surface Type: TURF-G
Heading: —° / —°
Runway Width: 70 ft / 21 m
Surface Type: TURF-G
Heading: —° / —°
RWY E
No ILS / Visual Only
RWY W
No ILS / Visual Only
No frequency data available.
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026