曝光台 注意防骗
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2. Statesville Unicom, Beech Two Three Alpha Bravo TEN EAST, Airport Advisory, Over
End with the term OVER, since you are requesting a response.
3. Zahns Traffic, Bonanza Seven Four Three Four X-Ray turning base runway Two Zero.
You are announcing to other aircraft in the area where you are, and what you are doing. You do NOT end
with the term OVER, as you are not requesting a response.
4. Gainsville Departure, Four Five Foxtrot, Out.
You use the term OUT to indicate the communication is ended, and no further response is expected.
Uncontrolled Airports
At airports without a control tower, it is very important to be alert for other aircraft which may be
operating in close proximity to the airport. Other aircraft close to you may not have radio equipment. All
radio equipped aircraft operating around an uncontrolled airport should communicate on a Common
Frequency.
Common Traffic Advisory Freqiency (CTAF)
Radio Communication
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Most uncontrolled airports are equipped with a ground station for communication with ground personnel
and air to air communication between aircraft operating in the vicinity. This frequency is published
within the airport information block on the aeronautical chart. It is called the Common Traffic Advisory
Frequency (CTAF) and is denoted by the letter C within either a Magenta or Blue filled circle following
the frequency number.
The frequencies will normally be in the range of 122.7 to 122.95. Occasionally, due to a high volume of
communication traffic within a geographical area, frequencies above 123.0 MHz may be used. When
approaching such airports, call about ten miles out, requesting airport advisory. Normally ground
personnel will respond with information about traffic, active runway and wind. It is important to note that
such information is advisory in nature. The pilot is the final authority for operation of the aircraft.
You should announce your position and/or intentions for the following situations.
INBOUND
· Entry into downwind Leg
· Turn to Base Leg
· Turn to Final Leg
· Clear of the active runway
OUTBOUND · On the ramp, ready to taxi to departure runway
· Ready for departure, runway to be used , and direction of departure
Ground based stations at uncontrolled airports.
· LLA - Local Airport Advisory - used at airports where a FSS is located. Call the FSS on 123.6 and
request airport advisory. Example: “Hickory Radio, Skyhawk 53417 is 10 miles East, at Three Thousand
five hundred, landing Hickory. Request airport advisory”. The FSS will respond with Wind direction and
Velocity, Altimeter setting, active runway, and any known traffic.
· UNICOM - these are non-government stations operated by the local operator or airport management, to
advise about known traffic, which runway is being used, and may advise wind condition. They transmit
on 122.7, 122.725, 1228, 122.975 and 123.0
· MULTICOM - frequency 122.9 MHz. Pilots should use this frequency at airports where there is no
ground-based communication facility such as UNICOM or LAA. The pilot is to self-announce position
and intentions the same as on UNICOM. This procedure allows other aircraft in the area to know where
you are and your intentions. The MULTICOM frequency of 122.9 is shown on the charts the same as
LAA and UNICOM, with the circled C indicator following the frequency.
Controlled Airports
Radio Communication
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Communication at control towered airports involve communication with at least 3 facilities.
· Automatic Terminal Information Service (ATIS) (Listen only)
· Ground Control
· Tower
Additionally, at larger airports, there will be:
· Clearance Delivery
· Approach Control
· Departure Control
ATIS
ATIS broadcasts a repetitive tape containing information such as runways in use, altimeter setting,
weather conditions, wind direction and velocity, communication frequencies and other information
pertinent to operating in the vicinity of or on the airport. Prior to departure, you should listen to ATIS
before to calling Clearance Delivery or Ground Control. On arrival, listen to ATIS before
callingApproach Control.
Whenever the weather or other conditions change during the day, the recording is updated. Each time a
new recording is made, it is assigned an identifier name, starting with ALPHA. Subsequent updates are
identified as BRAVO, CHARLIE, etc. When making initial contact with approach Control or Tower on
arrival, and Clearance Delivery or Ground Control on departure you should state that you have the ATIS
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