Reference only — not for real-world navigation.
KFSI
Henry Post Army Air Field · Fort Sill
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
1,189 ft / 362 m
Transition Altitude
18,000 ft
Primary Channel
TWR 124.95 MHz (POST TWR)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
17/35 · 5,000 ft · ConcreteLIGHTEDFlight Planning
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Welcome to the technical flight briefing for Henry Post Army Air Field (KFSI), located in Fort Sill, 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 1,189 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
Henry Post Army Air Field
ICAO / IATA
KFSI / FSI
Municipality
Fort Sill
Country
Region
US-OK — Oklahoma
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
1,189 ft
Official Website
Wikipedia
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 17 / 35
LIGHTED
Runway Length: 5,000 ft / 1,524 m
Runway Width: 200 ft / 61 m
Surface Type: Concrete
Heading: 179.8° / 359.8°
Runway Width: 200 ft / 61 m
Surface Type: Concrete
Heading: 179.8° / 359.8°
RWY 17 (179.8°)
No ILS / Visual Only
RWY 35 (359.8°)
No ILS / Visual Only
A/D FORT SILL APP/DEP
118.60 MHz
ATIS ATIS
135.43 MHz
CLD CLNC DEL
121.70 MHz
GND POST GND
121.70 MHz
MISC DUNCAN SCTR
118.60 MHz
PMSV PMSV METRO
37.52 MHz
PTD PTD
123.05 MHz
TWR POST TWR
124.95 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026