Aeronautical Information Manual (AIM), page 171

Index   170 -- Page 171 -- 172

3-5-6. Terminal Radar Service Area (TRSA)
a. Background. TRSAs were originally estab-
lished as part of the Terminal Radar Program at
selected airports. TRSAs were never controlled
airspace from a regulatory standpoint because the
establishment of TRSAs was never subject to the
rulemaking process; consequently, TRSAs are not
contained in 14 CFR Part 71 nor are there any TRSA

operating rules in 14 CFR Part 91. Part of the Airport

Radar Service Area (ARSA) program was to

eventually replace all TRSAs. However, the ARSA

requirements became relatively stringent and it was

subsequently decided that TRSAs would have to

meet ARSA criteria before they would be converted.
TRSAs do not fit into any of the U.S. airspace classes;
therefore, they will continue to be non-Part 71
airspace areas where participating pilots can receive
additional radar services which have been redefined

as TRSA Service.
b. TRSAs. The primary airport(s) within the
TRSA become(s) Class D airspace. The remaining
portion of the TRSA overlies other controlled
airspace which is normally Class E airspace
beginning at 700 or 1,200 feet and established to
transition to/from the en route/terminal environment.

c. Participation. Pilots operating under VFR are

encouraged to contact the radar approach control and

avail themselves of the TRSA Services. However,

participation is voluntary on the part of the pilot. See

Chapter 4, Air Traffic Control, for details and


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.

Other Airspace Areas 3-5-9

Page 171 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   170 -- Page 171 -- 172