Chapter 28. National Security
Section 1. General
A National Security Area (NSA)
consists of airspace of defined vertical and
lateral dimensions established at locations
where there is a requirement for increased
security of ground facilities. Pilots are
requested to voluntarily avoid flying through an
NSA. When it is necessary to provide a greater
level of security, flight in an NSA may be
temporarily prohibited pursuant to the
provisions of 14 CFR 99.7, Special Security
Instructions. Where there is a need to restrict
flight operations in an NSA, the required
restriction will be issued by Airspace
Regulations and ATC Procedures Group and
disseminated via NOTAM.
An NSA is designated to
enhance national security and protect national
An NSA should be considered
when a need to protect national assets or a need
to protect an area in the interest of national
security is identified.
There are no standard
dimensions for an NSA. The dimensions should be
the minimum to promote the protection of the
national asset or area identified.
NSAs must be depicted on
aeronautical charts to inform users of the NAS
regarding their vertical and lateral dimensions.
Additionally, a note must be depicted on the
chart adjacent to the NSA stating the requested
SUSPENSION, OR REVOCATION
An NSA does not expire.
However, an NSA may be suspended or revoked at
the discretion of Airspace Regulations and ATC