Towered · Class D surface area
Castle (KMER) radio calls
Atwater, CAICAO KMER · FAA MER
Castle is a towered airport in Atwater, CA. You will taxi with Ground on 133.575 and work Castle Tower on 118.175, after listening to the ATIS on 124.475. The approach control is NorCal Approach on 120.95, which is who you call for VFR flight following. The tower operates 0700-2100 local.
The airport has a Class D surface area: two-way radio communication with the tower must be established before entering. Published hours: CLASS D SVC 0700-2100; OTHER TIMES CLASS G.
Frequencies
| ATIS | 124.475 |
|---|---|
| GroundCastle Ground | 133.575 |
| TowerCastle Tower | 118.175 |
| CTAF | 118.175 |
| UNICOM | 122.95 |
| Approach / DepartureNorCal Approach | 120.95 |
Airport
- Runways
- 13 · 31
- Right-hand pattern
- Runway 31
- Elevation
- 190 ft
- Tower hours
- 0700-2100 local
- Position
- 37.380, -120.568
Towered airport with a Class D surface area
Sample calls at KMER
Castle has a Class D surface area: establish two-way communication with the tower before entering (AIM 3-2-5 b 3). A reply that uses your call sign, even "standby", establishes it; "aircraft calling, standby" does not. The calls below use runway 13; the tower assigns the runway in use 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.
- Listen to the ATIS on 124.475 first and note the letter; "with Information (letter)" on your first call lets the controller skip the weather (JO 7110.65 3-10-1).
- YouCastle Ground, Cessna Three One Six Zero Foxtrot, at the ramp with Information Alpha, request taxi, VFR departure to the north.
- ATCCessna Six Zero Foxtrot, Castle Ground, runway one three, taxi via Alpha, hold short of runway one three.
- YouRunway one three, taxi via Alpha, hold short of runway one three, Cessna Six Zero Foxtrot.
- The runway, any clearance onto a runway and every hold-short instruction are read back (AIM 4-3-18 a 9). Stay on Ground through the run-up and switch to Tower when ready (AIM 4-3-14 a).
- YouCastle Tower, Cessna Six Zero Foxtrot, holding short runway one three, ready for departure, northbound.
- ATCCessna Six Zero Foxtrot, Castle Tower, runway one three, cleared for takeoff.
- YouRunway one three, cleared for takeoff, Cessna Six Zero Foxtrot.
- ATCCessna Six Zero Foxtrot, contact NorCal Approach one two zero point niner five.
- Youone two zero point niner five, Cessna Six Zero Foxtrot.
- YouNorCal Approach, Cessna Three One Six Zero Foxtrot, two thousand climbing four thousand five hundred, request VFR flight following to the north.
- ATCCessna Six Zero Foxtrot, NorCal Approach, radar contact, altimeter three zero zero one.
- YouAltimeter three zero zero one, Cessna Six Zero Foxtrot.
- Inbound: call the tower about 15 miles out, before the Class D boundary (AIM 4-3-2 a).
- YouCastle Tower, Cessna Three One Six Zero Foxtrot, one five miles north, three thousand, with Information Bravo, landing Castle.
- ATCCessna Six Zero Foxtrot, Castle Tower, enter left downwind runway one three, report midfield downwind.
- YouEnter left downwind runway one three, report midfield, Cessna Six Zero Foxtrot.
- YouCastle Tower, Cessna Six Zero Foxtrot, midfield left downwind, runway one three.
- ATCCessna Six Zero Foxtrot, runway one three, cleared to land, wind two seven zero at eight.
- YouRunway one three, cleared to land, Cessna Six Zero Foxtrot.
- The wind is information: acknowledged, not read back. Exit at the first available taxiway or as told, taxi clear of the hold-short markings, and change to Ground only when the tower says (AIM 4-3-21).
- ATCCessna Six Zero Foxtrot, exit at the next taxiway, contact Castle Ground one three three point five seven five.
- YouExit next taxiway, one three three point five seven five, Cessna Six Zero Foxtrot.
- YouCastle Ground, Cessna Six Zero Foxtrot, clear of runway one three, taxi to the ramp.
If things change. The tower operates 0700-2100 local. Outside those hours the airport is a non-towered field: self-announce on the CTAF, 118.175 with the airport name first and last, and the surface area reverts to Class E or Class G as published in the Chart Supplement.
Phraseology from AIM 4-2-3; 4-3-18 a 9; 4-3-14; 4-3-21; 4-4-7 b; 4-1-18 a 3; 3-2-5 b 3; 4-3-2 a. 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.
