BREVET 1: "HOUSTON CENTER, BREVET 1, REQUEST LOWER TO CANCEL IFR."
HOUSTON CTR: "BREVET 1, HOUSTON, DESCEND AND MAINTAIN ______
THOUSAND, ELLINGTON ALTIMETER 29.99"
After the controlling agency assigns an appropriate IFR altitude and local altimeter, direct the
pilot to descend. Once VMC is encountered below 18,000 feet the following transmissions
BREVET 1: "HOUSTON CENTER, BREVET 1, CANCEL IFR."
HOUSTON: "BREVET 1, HOUSTON. CANCELLATION RECEIVED, RADAR SERVICE
TERMINATED, SQUAWK APPROPRIATE CODE, FREQUENCY CHANGE APPROVED.
ELLINGTON ALTIMETER 29.98"
If VMC and/or visibility with the ground is still not available at the lower altitude, the only
option is to request an even lower altitude. In this situation, request descent to "minimum
vectoring altitude." The controlling agency will then clear the aircraft to the lowest altitude that
still enables them to provide radar service (see example below). If VMC is still not attainable,
expect to cancel the low-level portion and request IFR clearance to your destination or IFR pick-
up for an air navigation (ANAV) profile.
(2.) Terminating IFR below the Class "A" Airspace: If below the Class "A" Airspace in IMC
the voice communication procedures are the same as the above example:
"AGENCY, CALL SIGN, request descent to (an MSL below lower ceiling/cloud layer OR
'Minimum Vectoring Altitude') to cancel IFR."
After acknowledging instructions, direct the descent to the assigned altitude.
Of course, if not in Class A airspace and VMC, simply confirm your intentions with the pilot and
cancel IFR with the appropriate facility:
"AGENCY, CALL SIGN, cancel IFR."
NOTE: While VMC may exist at the low-level altitude, required visibility for military training
visual routes is 3000' ceilings with 5nm visibility (AP-1B).
184.108.40.206. Calls to Flight Service Station: Approximately five to ten minutes prior to low-level
entry compute your entry time (minutes after the hour) and contact the appropriate flight service
station. This call begins with a courtesy call including call sign, general location, and radio type:
BUC 44: "ANNISTON RADIO, BUC 44, VICINITY OF MOBILE, ON UNIFORM."
After approximately 10 to 20 seconds, the FSS will acknowledge:
FSS: "BUC 44, ANNISTON RADIO, GO AHEAD".
Your reply will use the following format:
BUC 44: "ANNISTON RADIO, BUC 44, A SINGLE T-1A (or T-39), ENTERING
VICTOR ROMEO ONE ZERO TWO ONE (VR-1021), POINT A, TIME ______ (minutes