St Clair County International Airport frequencies
St Clair County International Airport (PHN · KPHN) in Port Huron, MI has no control tower, so nobody is sequencing traffic here — you announce your own position on 123.05. Every frequency below is in the order you tune it. · Open on the map
All of St Clair County International Airport — runways, frequencies, charts and live weatherBefore taxi
- ASOS/AWOS 118.375
- An automated weather station reading the field conditions aloud — wind, visibility, ceiling, temperature and altimeter. It replaces ATIS at a field with no controller to record one. Get the altimeter setting before you descend below the transition altitude.
Taxi & takeoff
- CTAF 123.05
- The common frequency pilots use to announce themselves to each other at a field with no operating control tower. Nobody is controlling traffic — you are self announcing. Report your position and intentions on entry and on each leg of the pattern, and listen well before you transmit.
- UNICOM 123.05
- A ground station run by the FBO rather than the FAA, for fuel, parking and airport services. Use it for services. Where the field has no separate CTAF, the same frequency doubles as the advisory frequency.
Departure & arrival Selfridge
- App/Dep 119.6
- One radar controller working both arrivals and departures — normal at a smaller TRACON. The same frequency takes your climb out and your inbound call.
Also
- Flight service 126.525 (HIGH)
- Flight Service handles briefings, flight plans and en route advisories, reached here through a remote outlet. Open and close VFR flight plans, and get updated weather in the air. 1-800-WX-BRIEF reaches the same specialists from the ground.
What to say on 123.05
Nobody is sequencing traffic at KPHN, so every call is you telling other aircraft where you are. Open and close with the field name so a pilot tuned to a shared frequency knows which airport you mean — 123.05 is not unique to St Clair County International Airport.
- Inbound, 10 miles out
St Clair traffic, Skyhawk one two three four five, one zero miles south, inbound landing runway 04, St Clair.
- Entering the pattern
St Clair traffic, Skyhawk one two three four five, entering left downwind runway 04, St Clair.
- Before taking the runway
St Clair traffic, Skyhawk one two three four five, departing runway 04, St Clair.
Pattern direction is not always left here — check the KPHN traffic pattern before you announce a leg. The Chart Supplement is authoritative if KPHN publishes a call name that differs from the airport's. Full guidance →
By procedure & sector (2 more)
| 285.525 | ALGONAC RCAG (HIGH) |
|---|---|
| 391.9 | APCH/P DEP/P |
Every KPHN frequency, as one table
| ASOS/AWOS | 118.375 |
|---|---|
| CTAF | 123.05 |
| UNICOM | 123.05 |
| Flight service | 126.525 (HIGH) |
| App/Dep | 119.6 |
Frequently asked
What is the CTAF at KPHN?
St Clair County International Airport is non towered. The common traffic advisory frequency is 123.05 — announce your position and intentions on entry and on each leg of the pattern.
What is the ASOS/AWOS frequency at KPHN?
ASOS/AWOS at St Clair County International Airport is 118.375. It is an automated broadcast, so there is no letter to report — just take the altimeter setting and wind.
What is the approach frequency for KPHN?
App/Dep for St Clair County International Airport is 119.6, working as "Selfridge". Call inbound for flight following or to begin an instrument approach.
More about KPHN
Frequencies from FAA NASR. For planning and education only; always verify against official sources.