Imagine this: night has fallen as you approach St. Louis Regional Airport (ALN), with runway lights twinkling in the distance. To ensure a safe landing, you need immediate access to critical airport information. This guide provides the latest operational details for ALN to help pilots execute safe and efficient flights.
Airport Overview: ALTON/ST LOUIS, ILLINOIS
St. Louis Regional Airport (ALN), also known as ALTON/ST LOUIS, ILLINOIS, is located near Alton and St. Louis in Illinois. The airport features two primary runways serving various aircraft types.
Runway Information: Key Specifications
- Runway 17-35: Measures 6,500 feet in length and 100 feet in width. Pavement strength classification is S-47, D-63, 2D-109 with a PCR value of 180 F/D/X/T. Equipped with Medium Intensity Runway Lights (MIRL) and Runway End Identifier Lights (REIL).
- Runway 11-29: Measures 8,099 feet in length and 150 feet in width. Pavement strength classification is S-106, D-144, 2D-198, 2D/2D2-575 with a PCR value of 440 F/D/X/T. Features High Intensity Runway Lights (HIRL).
Critical Frequencies: Communication Essentials
- Area Tower: 128.0 MHz
- Automatic Terminal Information Service (ATIS): 239.0 MHz
- Ground Control: 126.0 MHz
- Clearance Delivery: 120.2 MHz (used when tower is closed)
- Common Traffic Advisory Frequency (CTAF): 126.0 MHz
Geographic Data: Precise Location
The airport reference point coordinates are 38°53.5'N, 90°03.5'W with an elevation of 544 feet.
Magnetic Variation: Navigation Adjustment
As of January 2025, the annual change rate is 0.1°W with a magnetic variation of 2.1°W.
Operational Considerations: Safety Protocols
- Runway Readback Requirement: Full readback of all runway holding instructions is mandatory.
- Runway Crossing Caution: Exercise heightened awareness when receiving runway crossing clearances to prevent conflicts.
Airport Facilities: Navigation Support
The airport contains several key facilities including the South Hangar, Administration Building, Fire Station, Control Tower, Flight School, and Fixed Base Operator (FBO). The North Hangar provides additional aircraft parking and maintenance services.
Lighting Systems: Landing Assistance
Runway 11 and Runway 17-35 are both equipped with appropriate lighting systems to aid pilots during nighttime operations or low visibility conditions.
Pavement Strength: Understanding PCR Values
The Pavement Classification Rating (PCR) serves as a crucial indicator of runway load-bearing capacity. Proper interpretation of PCR values is essential for safe aircraft operations. ALN's two runways feature different PCR values, requiring pilots to select the appropriate runway based on their aircraft's weight and landing gear configuration.
Weather Information: ATIS Importance
Pilots must monitor ATIS broadcasts (239.0 MHz) before approaching ALN to obtain current weather conditions, runway status, and other critical notices. Timely access to accurate meteorological data supports informed flight decision-making.
Maintenance Notice: EC-3 Advisory
Note: Airport maintenance under EC-3 notice will occur from December 25, 2025 through January 22, 2026. Pilots should remain aware of related operational impacts.
Conclusion: Preparedness Ensures Safety
St. Louis Regional Airport (ALN) plays a vital role in regional aviation. By thoroughly understanding runway specifications, communication frequencies, geographic data, and operational protocols, pilots can better plan flights and maintain safety standards. Remember that successful flights begin with comprehensive preparation and meticulous attention to detail.