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((short description|VHF radio frequency used in air-to-air communication))
((Use dmy dates|date=December 2023))
((More citations needed|date=September 2018))
'''Common traffic advisory frequency''' ('''CTAF''') is the name given to the [[Very high frequency|VHF]] radio frequency used for air-to-air communication at United States, Canadian and Australian [[non-towered airport]]s.

Many towered airports close their towers overnight, keeping the airport open for [[air cargo|cargo operations]] and other activity. Pilots use the common frequency to coordinate their arrivals and departures safely, giving position reports and acknowledging other aircraft in the [[airfield traffic pattern]].

In many locations, smaller airports use [[Pilot-controlled lighting|pilot-controlled lighting systems]] when it is uneconomical or inconvenient to have automated systems or staff to turn on the taxiway and runway lights. In Canada, the lighting system is accessed through an [[Pilot-controlled lighting|aircraft radio control of aerodrome lighting]] (ARCAL) frequency, which is often shared with the CTAF.

Two common CTAF allocations are [[UNICOM]] and [[MULTICOM]]. UNICOM is a licensed non-government base station that provides air-to-ground and ground-to-air communication, and may also serve as a CTAF when in operation. MULTICOM is a frequency allocation without a physical base station that is reserved as a CTAF for airports without other facilities.

== Australia ==
In Australia, there are many landing strips in remote locations that have CTAF operations 24 hours a day, seven days a week. There are also CTAF(R) landing strips which require the aircraft intending to enter the area of operation to be fitted with a radio. The most common CTAF frequency is 126.7&nbsp;MHz<ref>https://www.casa.gov.au/sites/default/files/caap-166-01-operations-vicinity-non-controlled-aerodromes.pdf, section 2.1.11</ref> at non-towered aerodromes, except for when two CTAF airports are near each other. Aerodromes using CTAF outside tower hours typically nominate a frequency that is used during tower hours.

== United States ==
UNICOM and a CTAF may be mutually exclusive, but this is not always the case. In the United States, many non-towered airports use the same frequency for both UNICOM and CTAF purposes. Pilots are advised to check their sectional charts and/or Chart Supplement (formerly Airport/Facilities Directory) to determine the appropriate frequency for CTAF prior to operating at any given airport.

== United Kingdom ==
Unlicensed aerodromes in the United Kingdom often recommend pilots communicate with each other using SAFETYCOM, currently 135.480&nbsp;MHz.<ref>((cite web |url=http://skywise.caa.co.uk/safetycom-conversion-to-8-33-khz/ |title=Safetycom conversion to 8.33 KHZ |website=skywise.caa.co.uk |date= 7 November 2018|access-date=2019-09-30))</ref> However, most gliding clubs use the Glider Ground Station Common Field Frequency, currently 129.975&nbsp;MHz.<ref>[https://members.gliding.co.uk/library/laws-rules/radio-guidance/ BGA Laws and Rules, Radio Guidance], retrieved 2018-09-19.</ref>

== See also ==
*[[Acronyms and abbreviations in avionics]]

((Two-way radio))
((Telecommunications))

== References ==
((Reflist))

[[Category:Airbands]]
[[Category:Avionics]]


((Aviation-stub))

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