SNFO/SWSO VOICE COMMUNICATIONS
The altitude passing should be rounded to the nearest 100 feet
when passing an altitude.
If two-way communications cannot be established with the Center controller after changing
frequencies, contact the transferring controller for another frequency and report "negative
contract" or "no joy" on the previously assigned frequency. The transferring controller will then
give you further instructions.
"Memphis Center, KATT 814, no joy (or negative
contact) on 284.7."
"KATT 814, attempt contact with Memphis
Center on 287.4."
"Memphis Center, KATT 814, switching 287.4."
The normal communication sequence is: Departure, then Center for several sectors, then
309. REQUESTING FREQUENCY CHANGES
Aircraft with a single radio may need to request a frequency change from the current controller
in order to listen or make a call on a different frequency. Getting ATIS for an enroute approach
field or your final destination is one example. Never simply switch frequencies when under
positive control. Always request the switch from the controller.
"Atlanta Center, KATT 821, request off
frequency, monitor guard."
"KATT 821, frequency change approved, report
back up 3 minutes."
"KATT 821, wilco."
If more than one radio is available in the aircraft, the student
should not request "off frequency", but manage the radios so the
controlling frequency and the desired frequency are both
Always monitor guard. This is the emergency frequency (UHF 243.0/VHF 121.5). Most
military aircraft have the capability to monitor one primary frequency plus the emergency
frequency. If you did have to switch off the primary frequency, this enables the controller to call
3-12 IFR COMMUNICATIONS