Reference only — not for real-world navigation.
1LL2
Spring Brook Airport · Seneca
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
500 ft / 152 m
Transition Altitude
18,000 ft
Primary Channel
—
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
18/36 · 2,800 ft · ASPHLIGHTEDFlight Planning
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Welcome to the technical flight briefing for Spring Brook Airport (1LL2), located in Seneca, 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 500 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
Spring Brook Airport
ICAO / IATA
1LL2 / —
Municipality
Seneca
Country
Region
US-IL — Illinois
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
500 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 18 / 36
LIGHTED
Runway Length: 2,800 ft / 853 m
Runway Width: 70 ft / 21 m
Surface Type: ASPH
Heading: —° / 351°
Runway Width: 70 ft / 21 m
Surface Type: ASPH
Heading: —° / 351°
RWY 18
No ILS / Visual Only
RWY 36 (351°)
No ILS / Visual Only
No frequency data available.
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026