Aeronautical Information Manual (AIM), page 371

Index   370 -- Page 371 -- 372

airport or heliport in sight or, for a helicopter
point-in-space approach, the prescribed visual
reference with the surface is established. Also, if, at

any time during the approach the controller considers

that safe guidance for the remainder of the approach

cannot be provided, the controller will terminate

guidance and instruct the pilot to execute a missed

approach. Similarly, guidance termination and

missed approach will be effected upon pilot request

and, for civil aircraft only, controllers may terminate

guidance when the pilot reports the runway,

airport/heliport or visual surface route

(point-in-space approach) in sight or otherwise

indicates that continued guidance is not required.

Radar service is automatically terminated at the

completion of a radar approach.

1. The published MDA for straight-in approaches will be
issued to the pilot before beginning descent. When a
surveillance approach will terminate in a circle-to-land
maneuver, the pilot must furnish the aircraft approach
category to the controller. The controller will then provide
the pilot with the appropriate MDA.


3. A NO-GYRO APPROACH is available to
a pilot under radar control who experiences
circumstances wherein the directional gyro or other
stabilized compass is inoperative or inaccurate.

When this occurs, the pilot should so advise ATC and

request a No-Gyro vector or approach. Pilots of

aircraft not equipped with a directional gyro or other
stabilized compass who desire radar handling may
also request a No-Gyro vector or approach. The pilot
should make all turns at standard rate and should

execute the turn immediately upon receipt of

instructions. For example, "TURN RIGHT," "STOP
TURN." When a surveillance or precision approach
is made, the pilot will be advised after the aircraft has
been turned onto final approach to make turns at half
standard rate.

5-4-12. Radar Monitoring of Instrument

a. PAR facilities operated by the FAA and the

military services at some joint-use (civil and

military) and military installations monitor aircraft

on instrument approaches and issue radar advisories

to the pilot when weather is below VFR minimums

(1,000 and 3), at night, or when requested by a pilot.

This service is provided only when the PAR Final

Approach Course coincides with the final approach

of the navigational aid and only during the

operational hours of the PAR. The radar advisories

serve only as a secondary aid since the pilot has

selected the navigational aid as the primary aid for the


b. Prior to starting final approach, the pilot will be
advised of the frequency on which the advisories will
be transmitted. If, for any reason, radar advisories
cannot be furnished, the pilot will be so advised.

c. Advisory information, derived from radar
observations, includes information on:

1. Passing the final approach fix inbound
(nonprecision approach) or passing the outer marker
or fix used in lieu of the outer marker inbound
(precision approach).
At this point, the pilot may be requested to report sighting
the approach lights or the runway.

2. Trend advisories with respect to elevation

and/or azimuth radar position and movement will be


Whenever the aircraft nears the PAR safety limit, the pilot
will be advised that the aircraft is well above or below the
glidepath or well left or right of course. Glidepath

information is given only to those aircraft executing a
precision approach, such as ILS. Altitude information is
not transmitted to aircraft executing other than precision
approaches because the descent portions of these
approaches generally do not coincide with the depicted
PAR glidepath.

Arrival Procedures 5-4-35

Page 371 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   370 -- Page 371 -- 372