Sport Aircraft Process
Privileges & Limitations
Part 103 Preamble
Visibility & Cloud
Visual Approach Slope Indicator (VASI)
Communication at Airports without operating Control Towers
Jim Sweeney, NAPPF
COMMON TRAFFIC ADVISORY FREQUENCY (CTAF) - A designated
frequency for the purpose of carrying out
airport advisory practices while operating to or from an
airport that does not have a control tower or an airport where
the control tower Is not operational.
The CTAF is normally a UNICOM, MULTICOM, flight service
station (FSS) frequency, or a tower frequency.
CTAF will be identified in appropriate aeronautical
UNICOM stations may provide pilots, upon request, with
weather information, wind direction, the recommended
runway, or other necessary information.
If the UNICOM frequency is designated as the CTAF, it will be
identified in appropriate aeronautical publications.
FSS (Flight Service Station)
An FSS physically located on an airport may provide airport
advisory service (AAS) at an airport that does not have a
control tower or where a tower is operated on a part-time
basis and the tower is not in operation.
The CTAFs for FSSs which provide this service are published
in appropriate aeronautical publications.
A mobile service, not
open to public correspondence use, used for essential communications in the
activities performed by or directed from private aircraft.
Airports without Operation Control Towers
(Common Traffic Advisory Frequency)
Marked on the Sectional Chart
Common CTAF Frequencies
Airports with no frequencies published
MULTICOM - 122.9
When to communicate
Before taxiing and before taxiing on the runway for departure.
10 miles out, and entering downwind, base, and final, and leaving the
Weather Advisories at airports without operating Control Towers
AWOS, ASOS (Automated Weather Observation System,
Automated Surface Observation System)
Frequency marked on the Sectional Chart
AWOS - These real-time systems are operationally
classified into four basic levels:
(a) AWOS-A: only reports altimeter
(b) AWOS-1: usually reports altimeter
setting, wind data, temperature, dew point, and density altitude,
(c) AWOS-2: provides the information
provided by AWOS-1 plus visibility, and
(d) AWOS-3: provides the information
provided by AWOS-2 plus cloud/ceiling data.
The information is transmitted over a discrete VHF
radio frequency or the voice portion of a local NAVAID.
Receivable to a maximum of 25 NM from the AWOS site and a
maximum altitude of 10,000 feet AGL.
Most AWOS sites also have a dial-up capability so that
the messages can be accessed via telephone.
AWOS information (system level, frequency, phone number,
etc.) is published, in the Airport Facility Directory
ASOS - The ASOS will provide continuous minute-by-minute
observations and perform the basic observing functions necessary to generate an
aviation routine weather report (METAR) and other aviation weather information.
CTAF, AWOS/ASOS on the Sectional Chart
ASOS - 118.526
(Common Traffic Advisory Frequency) - 122.8
Airports with Control Towers
Control Tower Frequency (CT)
Control of traffic in the controlled
Frequency on the Sectional Chart
ATIS - Automated Traffic Information System
This information includes: wind,
runway, and altimeter setting at the airport of intended landing.
Control Tower and ATIS Frequencies on the Sectional Chart
CT - 118.8
ATIS - 128.5
Unicom - 122.95
* Hours of Operation
(Common Traffic Advisory Frequency) - 118.6
Air to Air Communication Frequency
122.75 - Official air
123.45 - not so official
AC 90-42F - TRAFFIC ADVISORY PRACTICES AT AIRPORTS
WITHOUT OPERATING CONTROL TOWERS
Part 1 of what you need to know about aviation band radios. Jim Sweeney chats
with us about aviation band radios and how to get them to work on your
ultralight aircraft. www.nappf.com (7/1/03)
Jim Sweeney, NAPPF
Part 2 of what you need to know about aviation band radios. We get into details
about radio antennas and their mountings. Selecting radios and matching it to
your headsets. www.nappf.com (7/1/03)
Text & Graphics for the Sound Clip
The Four Basics of a Radio Transmission
1. WHO You Are Calling
2. WHAT You Are
3. WHERE You Are
4. WHAT You Want
The Phonetic Alphabet
Charlie (Char-lee or Shar-lee)
Uniform (You-nee-form) or (oo-nee-form)
Airport Information for Salem, IL Airport
Announcements to be Made in The Airport Traffic Pattern