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In 2017, the FAA announced a final policy determination which would remove 641 of the roughly 2,100 RCOs in the conterminous United States, Hawaii and Puerto Rico. However, as of that announcement, over 95% of the outposts which use 122.2MHz, the standard FSS frequency, will be retained.
The Airport/Facility Directory also provides a means for the FAA to communicate, in text form, updates to visual navigation charts between their revision dates — VFR Sectional and Terminal Area Charts are generally revised every six months. Volumes are side-bound at 5 + 3 ⁄ 8 by 8 + 1 ⁄ 4 inches (140 mm × 210 mm), and colored a ...
Common traffic advisory frequency (CTAF) is the name given to the VHF radio frequency used for air-to-air communication at United States, and Australian non-towered airports. Many towered airports close their towers overnight, keeping the airport open for cargo operations and other activity.
During these times, pilots self-announce their position and/or intentions over the CTAF frequency, which is often the same as the UNICOM frequency. [6] When a part-time UNICOM station is located on the same airport as a part-time control tower, the same frequency will be used by both ground stations to avoid confusion.
In the United States, there is one MULTICOM frequency: 122.9 MHz. (See AIM table 4-1-2 or AIM table 4-1-1) At uncontrolled airports without a UNICOM, pilots are to self-announce on the MULTICOM frequency. In Australia, there is one MULTICOM frequency: 126.7 MHz. In Brazil, there is one MULTICOM frequency: 123.45 MHz.
Radio aeronautical navigation aids use other frequencies. Non-directional beacons (NDB)s operate on low frequency and medium frequency bands 190–415 kHz and 510–535 kHz. The instrument landing system (ILS) glide path operates in the UHF range of 329.3–335.0 MHz with marker beacons at 75 MHz.
A center's communication frequencies (typically in the very high frequency aviation bands, using amplitude modulation (AM) 118 MHz to 137 MHz, for overland control) are published in aeronautical charts and manuals, and are also announced to a pilot by the previous controller during a hand-off. Most VHF radio assignments also have a UHF (225 to ...
The presence of HIWAS information on a VOR was indicated on a sectional or terminal area chart by an "H" in the upper-right corner of the box surrounding the NAVAID frequency. [ 3 ] On 8 January 2020 the Federal Aviation Administration discontinued the HIWAS service in favor of Flight Information Services-Broadcast (FIS-B) and other modern ...