INSTRUMENT FLIGHT RULES WORKBOOK
type of flight plan (VFR), and
Navy 6E432 was over the Crestview VORTAC at 1427, altitude 6,500 feet, enroute to NAS
Whiting Field on a VFR flight plan.
"CRESTVIEW RADIO, NAVY 6E432, CRESTVIEW 27, 6,500, VFR, NAVY WHITING."
ATC has been delegated the responsibility to maintain air traffic separation of all aircraft flying
on an IFR clearance. Your aircraft will be under the control of ATC from takeoff until landing
DPC during the climb, ARTCC during the enroute phase, and APC during the descent into the
DPC/APCs are located at airports and ARTCCs are located strategically around the country. The
term ATC means one or all three collectively. As you will note in the text, the ATC clearance
which you first receive will be the basic enroute clearance from the ARTCC.
ARTCCs are capable of direct communications with IFR air traffic on certain frequencies.
Maximum communications coverage is possible through the use of remote center/air ground sites
comprised of VHF and UHF transmitters and receivers. These sites are located throughout the
United States and are indicated on the IFR Enroute Charts. Although the sites may be several
hundred miles away from the ARTCC, they are remoted to the centers by land lines or
microwave links. As IFR operations are expedited through the use of direct communications,
pilots are requested to use these frequencies strictly for communications pertinent to the control
of IFR aircraft. DPC, through the tower, will provide a specific departure clearance when you
are ready for takeoff, and APC will issue your approach clearance upon your arrival at your
Departure Control, through the tower, will provide a specific departure clearance when you are
ready for takeoff and Approach Control will issue your approach clearance upon your arrival at
When a pilot flies a flight plan with base operations, the processing of the clearance begins.
Flight plans should be filed at least 30 minutes prior to your desired takeoff time. Base
operations personnel will relay the request to Air Traffic Control (normally via a Flight Service
Station) where it is placed in a computer with other clearance requests. The computer will
analyze flight times, routes, altitudes, etc., and grant a specific clearance to each aircraft. ATC
will relay this clearance to Ground Control/Clearance Delivery at the departure airport.
(Normally ATC will wait until the clearance is requested.) Ground Control/Clearance Delivery
INTRODUCTION TO GROUND, AIRBORNE, LOST COMMUNICATION, AND
EMERGENCY VOICE PROCEDURES 8-11