How Do You Hear Me?: #4 VFR Flight Following
By Robert Gray, ATP CFI
It’s the next best thing to flying IFR – Radar Traffic Information Service. Or, as it’s more commonly known, VFR Flight Following. And most often it can be yours for the asking. All you need is two-way radio communications and a transponder. This is a service provided by radar air traffic control (ATC) facilities such as TRACON (Terminal Radar Approach Control) and ARTCC (Air Route Traffic Control Center). You’re more likely to know these ATC facilities by names such as March Approach, SoCal Approach or Los Angeles Center. According to the AIM [4-1-15], “pilots receiving this service are advised of any radar target observed on the radar display which may be in such proximity to the position of their aircraft or its intended route of flight that it warrants their attention.” Now that is a significant enhancement to the safety of flight. At the same time, we are reminded that this service is not intended to relieve the pilot of the responsibility for continual vigilance to “see and avoid” other aircraft.
Preventing collisions is referred to as “separation”, which is a term used to prevent aircraft from coming too close to each other by use of lateral, vertical and longitudinal separation minima. One of the principal duties of an air traffic controller is to provide separation services for aircraft on IFR flight plans. Therefore, VFR flight following is provided to pilots on a workload permitting basis. In my experience, I’ve found the controllers to be very accommodating and I’ve rarely been denied this service. Air traffic controllers do a masterful job of managing multiple aircraft operating in their sector of airspace.
In addition to traffic advisories, controllers will provide “safety alerts” if they judge that an aircraft is at an altitude that places it in unsafe proximity to terrain, obstructions, or other aircraft. They will use the phraseology “traffic alert” or “low altitude alert” followed by a description of the hazard and a suggestion for avoiding it. You may also request radar vectors to assist you with navigation or to maintain separation from other traffic.
If you anticipate using VFR flight following, a little homework prior to departure will serve you well. You can find the frequency of radar air traffic control facilities in a number of places including your Airport/Facility Directory (A/FD). Look for the ® symbol at your departure airport or an airport in the vicinity of your route of flight. You can also find ARTCC’s conveniently listed in the A/FD – look on the back cover for “ARTCC”. If you are using a Terminal Area Chart (TAC) for navigation, TRACON frequencies are listed in a box adjacent to Class B and Class C airspace boundaries. Of course, if you’re departing a towered airport, the tower controller can advise you of the correct frequency. And remember, you can always ask a knowledgeable pilot at the local FBO prior to departure. Departing our local airport, French Valley, we should contact March Approach on 133.5 or SoCal Approach on 134.0. Make your initial call on the frequency that you believe to be correct. If it’s not correct, there’s a very good chance that an air traffic controller will respond and give you the correct frequency.
So, you’ve done your homework and written down the appropriate frequencies. You’ve departed the airport, climbed to cruising altitude and are en route to your destination. For purposes of illustration, let’s assume you’ve climbed to 4,500 feet and you’re on your way to Van Nuys. Now you’re ready to contact ATC and make your request for VFR flight following. What do you say? Well, you can begin by saying the name of the facility you’re calling, your aircraft type and full call sign:
“March Approach, Skyhawk 20957, request.”
March GCA will acknowledge by saying:
“Skyhawk 20957 go ahead.”
Respond with your call sign, aircraft type and equipment suffix, position and altitude, where you’re going, and that you’re requesting flight following:
“Skyhawk 20957 is a Cessna 172/G, three miles west of French Valley, 4500 feet, VFR to Van Nuys, request flight following.”
ATC will then issue you a transponder code, identify you on radar and give you the local altimeter setting. From that point onward you’re receiving traffic advisories. You should always listen up on the radio and make a timely response to ATC. In time, you’ll be handed off to other ATC sectors as you pass through them during your flight. As you’re handed off to the next sector, you will be given a frequency to make contact with the next air traffic controller:
“Skyhawk 20957, contact SoCal Approach on 134.0.”
Acknowledge by reading back the assigned frequency.
“134.0, Skyhawk 20957.”
When you change frequencies and check in with the next controller, you should state:
“SoCal Approach, Skyhawk 20957, level 4500.”
When you’re within radio range of the destination airport, listen for weather information on the appropriate frequency and let ATC know that you have the current weather:
“Socal Approach, Skyhawk 20957 with ATIS information Echo.”
As you approach you’re destination, you’ll be handed to the tower controller.
“Skyhawk 20957, contact Van Nuys tower on 119.3.
Again, acknowledge by reading back the assigned frequency.
“119.3, Skyhawk 20957.”
Contact the tower, follow their instructions and make your approach and landing. See, nothing to it…!! By the way, towered airport operations will be the subject of an upcoming article.
Just so you know what to expect along your route of flight, here are some typical ATC advisories and common terms contained in the Pilot-Controller Glossary. You should become familiar with these terms:
Affirmative: “Yes.”
Expedite: Used by ATC when prompt compliance is required to avoid the development of an imminent situation. Expedite climb/descent normally indicates to a pilot that the approximate best rate of climb/descent should be used without requiring an exceptional change in aircraft handling characteristics.
Ident: A request for a pilot to activate the aircraft transponder identification feature. This will help the controller to confirm an aircraft identity or to identify an aircraft.
Immediately: Used by ATC or pilots when such action compliance is required to avoid an imminent situation.
Maintain: Concerning altitude/flight level, the term means to remain at the altitude/flight level specified. The phrase “climb and” or “descend and” normally precedes “maintain” and the altitude assignment; e.g., “descend and maintain 5,000.” Concerning other ATC instructions, the term is used in its literal sense; e.g., maintain VFR.
Negative: “No,” or “permission not granted,” or “that is not correct.”
Negative Contact: Used by pilots to inform ATC that previously issued traffic is not in sight. It may be followed by the pilot’s request for the controller to provide assistance in avoiding the traffic. Also used to advise that they were unable to contact ATC on a particular frequency.
Pilot’s Discretion: When used in conjunction with altitude assignments, means that ATC has offered the pilot the option of starting climb or descent whenever he/she wishes and conducting the climb or descent at any rate he/she wishes. He/she may temporarily level off at any intermediate altitude. However, once he/she has vacated an altitude, he/she may not return to that altitude.
Radar Contact: Used by ATC to inform an aircraft that it is identified on the radar display and radar flight following will be provided until radar identification is terminated. Radar service may also be provided within the limits of necessity and capability.
Radar Contact Lost: Used by ATC to inform a pilot that radar data used to determine the aircraft’s position is no longer being received, or is no longer reliable and radar service is no longer being provided. The loss may be attributed to several factors including the aircraft merging with weather or ground clutter, the aircraft operating below radar line of sight coverage, the aircraft entering an area of poor radar return, failure of the aircraft transponder, or failure of the ground radar equipment.
Radar Service Terminated: Used by ATC to inform a pilot that he/she will no longer be provided any of the services that could be received while in radar contact.
Resume Own Navigation: Used by ATC to advise a pilot to resume his/her own navigational responsibility. It is issued after completion of a radar vector or when radar contact is lost while the aircraft is being radar vectored.
Squawk: Activate specific modes/codes/functions on the aircraft transponder (e.g. “Squawk four seven one zero.”
Stand By: Means the controller or pilot must pause for a few seconds, usually to attend to other duties of a higher priority. Also means to wait as in “stand by for clearance.” The caller should reestablish contact if a delay is lengthy. ”Stand by” is not an approval or denial.
Stop Altitude Squawk: Used by ATC to inform an aircraft to turn-off the automatic altitude reporting feature of its transponder. It is issued when the verbally reported altitude varies 300 feet or more from the automatic altitude report.
“Traffic 12 o’clock, four miles, eastbound, Piper Cherokee at 5000.”
“Traffic 9 o’clock, three miles, maneuvering, type and altitude unknown.”
Traffic in Sight: Used by pilots to inform a controller that previously issued traffic is in sight.
Unable: Indicates inability to comply with a specific instruction, request, or clearance.
Verify: Request confirmation of information; e.g., “verify assigned altitude.”
Roger: I have received all of your last transmission. It should not be used to answer a question requiring a yes or a no answer.
When Able: When used in conjunction with ATC instructions, gives the pilot the latitude to delay compliance until a condition or event has been reconciled. Unlike “pilot discretion,” when instructions are prefaced “when able,” the pilot is expected to seek the first opportunity to comply. Once a maneuver has been initiated, the pilot is expected to continue until the specifications of the instructions have been met. “When able,” should not be used when expeditious compliance is required.
Wilco: I have received your message, understand it, and will comply with it.
Until next time…