Non-towered · Class G at the surface
Montgomery County Airpark (KGAI) radio calls
Gaithersburg, MDICAO KGAI · FAA GAI
Montgomery County Airpark is a non-towered airport in Gaithersburg, MD. Nobody clears you to do anything: you self-announce on the CTAF, 123.075, as Montgomery County Airpark Traffic, with the airport name at the start and end of each call. The approach control for the area is Potomac Approach on 128.7, which is who you call for VFR flight following.
No Class B, C, D or E surface area is designated for this airport in the FAA data, so the airspace at the surface is Class G.
Frequencies
| Clearance Delivery | 121.6 |
|---|---|
| CTAFMontgomery County Airpark Traffic | 123.075 |
| Approach / DeparturePotomac Approach | 128.7 |
Airport
- Runways
- 14 · 32
- Right-hand pattern
- Runway 32
- Elevation
- 539 ft
- Position
- 39.168, -77.166
Non-towered airport: self-announce on the CTAF
Sample calls at KGAI
Montgomery County Airpark has no operating control tower. Every call below goes out on the CTAF, 123.075, to the other aircraft, not to a controller. The runway shown is 14; use whichever runway the wind and the traffic dictate on the day.
The aircraft is the AIM’s own example, Cessna Three One Six Zero Foxtrot; the squawk codes, altitudes and headings are illustrative. Frequencies, station names and runway numbers are this airport’s, from the FAA data.
- Tune 123.075. Nobody clears you; you announce and you listen. The airport name goes at the start and the end of every call, and the runway is always a number, never "the active" (AIM 4-1-9 g 8).
- YouMontgomery County Airpark traffic, Cessna Three One Six Zero Foxtrot, taxiing to runway one four, Montgomery County Airpark.
- YouMontgomery County Airpark traffic, Cessna Six Zero Foxtrot, departing runway one four, departing the pattern to the north, Montgomery County Airpark.
- Announce until you are about 10 miles out; on the way back, start announcing at 10 miles (AIM 4-1-9 c 1, TBL 4-1-1).
- YouMontgomery County Airpark traffic, Cessna Three One Six Zero Foxtrot, one zero miles south, two thousand five hundred, landing Montgomery County Airpark, Montgomery County Airpark.
- YouMontgomery County Airpark UNICOM, Cessna Six Zero Foxtrot, one zero miles south, request wind and runway information, Montgomery County Airpark.
- A UNICOM operator, if one is on, answers with the wind and the runway in use (AIM 4-1-9 h). If nobody answers, choose the runway from the wind and the pattern traffic you can hear.
- YouMontgomery County Airpark traffic, Cessna Six Zero Foxtrot, entering left downwind runway one four, full stop, Montgomery County Airpark.
- YouMontgomery County Airpark traffic, Cessna Six Zero Foxtrot, left base runway one four, Montgomery County Airpark.
- YouMontgomery County Airpark traffic, Cessna Six Zero Foxtrot, final runway one four, full stop, Montgomery County Airpark.
- YouMontgomery County Airpark traffic, Cessna Six Zero Foxtrot, clear of runway one four, Montgomery County Airpark.
If things change. Want flight following after departure? Call Potomac Approach on 128.7 once clear of the pattern: identification, type, position, altitude, destination, "request VFR flight following" (AIM 4-1-18 a 3). Do not use "any traffic in the area, please advise"; the AIM says it is not to be used under any condition (AIM 4-1-9 g 1).
Phraseology from AIM 4-1-9 c 1, g 1, g 8, h; TBL 4-1-1; 4-3-3. What TowerTalk grades against →
The calls you will make here
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Frequencies, runways and airspace from the FAA National Airspace System Resources (NASR) 28-day subscription, cycle effective Sep 3, 2026. Training use only. Always verify against a current Chart Supplement and sectional chart before flight; frequencies change. TowerTalk is not affiliated with the FAA. Report a discrepancy.
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