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participation is voluntary on the part of the pilot. See
Chapter 4, Air Traffic Control, for details and
procedures.
d. Charts. TRSAs are depicted on VFR sectional
and terminal area charts with a solid black line and
altitudes for each segment. The Class D portion is
charted with a blue segmented line.
3-5-7. National Security Areas
National Security Areas consist of airspace of defined
vertical and lateral dimensions established at
locations where there is a requirement for increased
security and safety of ground facilities. Pilots are
requested to voluntarily avoid flying through the
depicted NSA. When it is necessary to provide a
greater level of security and safety, flight in NSAs
may be temporarily prohibited by regulation under
the provisions of 14CFR Section 99.7. Regulatory
prohibitions will be issued by System Operations,
System Operations Airspace and AIM Office,
Airspace and Rules, and disseminated via NOTAM.
Inquiries about NSAs should be directed to Airspace
and Rules.

2/14/08 AIM
Services Available to Pilots 4-1-1
Chapter 4. Air Traffic Control
Section 1. Services Available to Pilots
4-1-1. Air Route Traffic Control Centers
Centers are established primarily to provide air traffic
service to aircraft operating on IFR flight plans within
controlled airspace, and principally during the
enroute phase of flight.
4-1-2. Control Towers
Towers have been established to provide for a safe,
orderly and expeditious flow of traffic on and in the
vicinity of an airport. When the responsibility has
been so delegated, towers also provide for the
separation of IFR aircraft in the terminal areas.
REFERENCEAIM,
Approach Control, Paragraph 5-4-3.
4-1-3. Flight Service Stations
a. Flight Service Stations (FSSs) are air traffic
facilities which provide pilot briefings, en route
communications and VFR search and rescue
services, assist lost aircraft and aircraft in emergency
situations, relay ATC clearances, originate Notices to
Airmen, broadcast aviation weather and National
Airspace System (NAS) information, receive and
process IFR flight plans, and monitor navigational
aids (NAVAIDs). In addition, at selected locations
FSSs provide En Route Flight Advisory Service
(Flight Watch), take weather observations, issue
airport advisories, and advise Customs and Immigration
of transborder flights.
b. Supplemental Weather Service Locations
(SWSLs) are airport facilities staffed with contract
personnel who take weather observations and provide
current local weather to pilots via telephone or radio.
All other services are provided by the parent FSS.
4-1-4. Recording and Monitoring
a. Calls to air traffic control (ATC) facilities
(ARTCCs, Towers, FSSs, Central Flow, and
Operations Centers) over radio and ATC operational
telephone lines (lines used for operational purposes
such as controller instructions, briefings, opening and
closing flight plans, issuance of IFR clearances and
amendments, counter hijacking activities, etc.) may
be monitored and recorded for operational uses such
as accident investigations, accident prevention,
search and rescue purposes, specialist training and
evaluation, and technical evaluation and repair of
control and communications systems.
b. Where the public access telephone is recorded,
a beeper tone is not required. In place of the “beep”
tone the FCC has substituted a mandatory requirement
that persons to be recorded be given notice they
are to be recorded and give consent. Notice is given
by this entry, consent to record is assumed by the
individual placing a call to the operational facility.
4-1-5. Communications Release of IFR
Aircraft Landing at an Airport Without an
Operating Control Tower
Aircraft operating on an IFR flight plan, landing at an
airport without an operating control tower will be
advised to change to the airport advisory frequency
when direct communications with ATC are no longer
required. Towers and centers do not have nontower
airport traffic and runway in use information. The
instrument approach may not be aligned with the
runway in use; therefore, if the information has not
already been obtained, pilots should make an
expeditious change to the airport advisory frequency
when authorized.
REFERENCEAIM,
Advance Information on Instrument Approach, Paragraph 5-4-4.
4-1-6. Pilot Visits to Air Traffic Facilities
Pilots are encouraged to visit air traffic facilities
(Towers, Centers and FSSs) and familiarize themselves
　
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