Flight Service Stations can provide weather information, obtain IFR clearances, and open and close flight plans for aircraft on the ground or en route. FSS frequencies are found on Sectional Charts above the VOR Identification boxes. A frequency with an R after it above the box is receive only (simplex). FSS receives the pilot's transmission on this frequency but they cannot reply on it. Pilots must listen on the VOR frequency found inside the box and state "listening on (frequency),” or “listening on (   ) VOR” in the initial call up. If there is no R after the frequency you can both receive and transmit on it. Always tell FSS what frequency you are listening on and where you are located.

PILOT: “Riverside Radio, DiamondStar 314AF (three one four alpha foxtrot) over Hector VOR, en route to Chino, listening on 112.7, request weather advisory for the Banning Pass.”

FSS: “Diamondstar 314AF, at 18:47 Zulu a Cessna 182 flying westbound at 4500 feet reported moderate turbulence in the Banning pass. Palm Springs airport reports winds at 330° and 20 knots, ceiling 10,500 broken, visibility 10 miles, altimeter 29.97.”