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Zero Foxtrot a call on (frequency) or (VOR)." If an
emergency exists or you need assistance, so state.
4.5.10Subsequent Contacts and Responses to
Call Up from a Ground Facility.Use the same
format as used for initial contact except you should
state your message or request with the call up in one
transmission. The ground station name and the word
Over" may be omitted if the message requires an
obvious reply and there is no possibility for
misunderstandings. You should acknowledge all
callups or clearances unless the controller of FSS
specialist advises otherwise. There are some
occasions when the controller must issue time−critical
instructions to other aircraft and he/she may be in
a position to observe your response, either visually or
on radar. If the situation demands your response, take
appropriate action or immediately advise the facility
of any problem. Acknowledge with your aircraft
identification, either at the beginning or at the end of
your transmission, and one of the words Wilco,
Roger, Affirmative, Negative" or other appropriate
remarks; e.g., Piper Two One Four Lima, Roger." If
you have been receiving services such as VFR traffic
advisories and you are leaving the area or changing
frequencies, advise the ATC facility and terminate
contact.
4.6Acknowledgement of Frequency Changes
4.6.1When advised by ATC to change frequencies,
acknowledge the instruction. If you select the new
frequency without an acknowledgement, the controller’s
workload is increased because he/she has no way
of knowing whether you received the instruction or
have had radio communications failure.
4.6.2At times, a controller/specialist may be
working a sector with multiple frequency assignments.
In order to eliminate unnecessary verbiage
and to free the controller/specialist for higher priority
transmissions, the controller/specialist may request
the pilot (Identification), change to my frequency
123.4." This phrase should alert the pilot that he/she
is only changing frequencies, not controller/specialist,
and that initial call−up phraseology may be
abbreviated.
EXAMPLE−
United Two Twenty−two on One Two Three Point Four"
or One Two Three Point Four, United Two Twenty−two."
4.6.3Compliance with Frequency Changes.
When instructed by ATC to change frequencies,
select the new frequency as soon as possible unless
instructed to make the change at a specific time, fix,
or altitude. A delay in making the change could result
in an untimely receipt of important information. If
you are instructed to make the frequency change at a
specific time, fix, or altitude, monitor the frequency
you are on until reaching the specified time, fix, or
altitudes unless instructed otherwise by ATC.
5. Communications for VFR Flights
5.1FSSs and Supplemental Weather Service Locations
(SWSLs) are allocated frequencies for different
functions; for example, 122.0 MHz is assigned as the
En Route Flight Advisory Service frequency at
selected FSSs. In addition, certain FSSs provide
Local Airport Advisory on 123.6 MHz or other
frequencies which can be found in the A/FD. If you
are in doubt as to what frequency to use, 122.2MHz
is assigned to the majority of FSSs as a common
enroute simplex frequency.
NOTE−
In order to expedite communications, state the frequency
being used and the aircraft location during initial call−up.
EXAMPLE−
Dayton radio, November One Two Three Four Five on
onetwo two point two, over Springfield V−O−R, over.
AIP
United States of America
GEN 3.4−13
15 MAR 07
Federal Aviation Administration Nineteenth Edition
5.1.1Certain VOR voice channels are being utilized
for recorded broadcasts; i.e., ATIS, HIWAS, etc.
These services and appropriate frequencies are listed
in the Airport/Facility Directory. On VFR flights,
pilots are urged to monitor these frequencies. When
in contact with a control facility, notify the controller
if you plan to leave the frequency to monitor these
broadcasts.
5.2Hazardous Area Reporting Service
5.2.1Selected FSSs provide flight monitoring where
regularly traveled VFR routes cross large bodies of
water, swamps, and mountains, for the purpose of
expeditiously alerting Search and Rescue facilities
when required.
5.2.1.1When requesting the service either in person,
by telephone or by radio, pilots should be prepared to
give the following information: type of aircraft,
　
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