AIM Text
- Stationary or Moving Altitude Reservation (ALTRV). A Stationary or Moving ALTRV is announced via an airspace NOTAM issued by the Central Altitude Reservation Facility (CARF) or ARTCC. These announcements will appear in CARF and/or ARTCC NOTAMS. This airspace ensures non-participating IFR aircraft remain separated from special activity. Non-participating VFR aircraft are permitted to fly through the area but should exercise vigilance.
- ATC ASSIGNED AIRSPACE. Airspace of defined vertical/lateral limits, assigned by ATC, for the purpose of providing air traffic segregation between the specified activities being conducted within the assigned airspace and other IFR air traffic. ATCAA locations and scheduled activation information can be found on the FAA SUA website; a NOTAM will not be issued to announce the activation of this airspace.
Source: FAA Aeronautical Information Manual · current edition · paragraph 3-5-10.
The short answer
This AIM section is FAA advisory guidance describing two non-charted airspace areas: the Stationary or Moving Altitude Reservation (ALTRV), announced by NOTAM from the Central Altitude Reservation Facility (CARF) or ARTCC, and ATC Assigned Airspace (ATCAA), assigned by ATC to segregate special activities from other IFR traffic.
Research Notes
Common Questions
Can VFR aircraft fly through a Moving ALTRV?
Per this section, non-participating VFR aircraft are permitted to fly through an ALTRV area but should exercise vigilance. The ALTRV ensures non-participating IFR aircraft remain separated from the special activity; it is announced via an airspace NOTAM issued by CARF or the ARTCC.
Is a NOTAM issued when ATC Assigned Airspace (ATCAA) is activated?
No. The AIM states a NOTAM will not be issued to announce activation of an ATCAA. Instead, ATCAA locations and scheduled activation information can be found on the FAA SUA website. ATCAA is airspace of defined vertical/lateral limits assigned by ATC to provide traffic segregation.
Where do ALTRV announcements appear?
A Stationary or Moving ALTRV is announced via an airspace NOTAM issued by the Central Altitude Reservation Facility (CARF) or ARTCC, and these announcements will appear in CARF and/or ARTCC NOTAMs.