Non-towered · Class G at the surface
St Clair County International (KPHN) radio calls
Port Huron, MIICAO KPHN · FAA PHN
St Clair County International is a non-towered airport in Port Huron, MI. Nobody clears you to do anything: you self-announce on the CTAF, 123.05, as St Clair County International Traffic, with the airport name at the start and end of each call. The approach control for the area is Selfridge Approach on 119.6, 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
| CTAFSt Clair County International Traffic | 123.05 |
|---|---|
| Approach / DepartureSelfridge Approach | 119.6 |
Airport
- Runways
- 04 · 22 · 10 · 28
- Elevation
- 650 ft
- Position
- 42.911, -82.529
Non-towered airport: self-announce on the CTAF
Sample calls at KPHN
St Clair County International has no operating control tower. Every call below goes out on the CTAF, 123.05, to the other aircraft, not to a controller. The runway shown is 04; 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 123.05. 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).
- YouSt Clair County International traffic, Cessna Three One Six Zero Foxtrot, taxiing to runway zero four, St Clair County International.
- YouSt Clair County International traffic, Cessna Six Zero Foxtrot, departing runway zero four, departing the pattern to the north, St Clair County International.
- 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).
- YouSt Clair County International traffic, Cessna Three One Six Zero Foxtrot, one zero miles south, two thousand five hundred, landing St Clair County International, St Clair County International.
- YouSt Clair County International UNICOM, Cessna Six Zero Foxtrot, one zero miles south, request wind and runway information, St Clair County International.
- 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.
- YouSt Clair County International traffic, Cessna Six Zero Foxtrot, entering left downwind runway zero four, full stop, St Clair County International.
- YouSt Clair County International traffic, Cessna Six Zero Foxtrot, left base runway zero four, St Clair County International.
- YouSt Clair County International traffic, Cessna Six Zero Foxtrot, final runway zero four, full stop, St Clair County International.
- YouSt Clair County International traffic, Cessna Six Zero Foxtrot, clear of runway zero four, St Clair County International.
If things change. Want flight following after departure? Call Selfridge Approach on 119.6 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
Nearby in Michigan
- D99Robertson Fieldnon-towered
- 39GAvocanon-towered
- 2E2Sharpe's Stripnon-towered
- 76GMarine Citynon-towered
- D20Yalenon-towered
- 57DRay Communitynon-towered
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.
This page is in release tier 2 and is not yet submitted to search engines.