曝光台 注意防骗
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Navigational guidance in azimuth and elevation is
provided the pilot until the aircraft reaches the
published decision height (DH). Advisory course and
glidepath information is furnished by the controller
until the aircraft passes over the landing threshold, at
which point the pilot is advised of any deviation from
the runway centerline. Radar service is automatically
terminated upon completion of the approach.
14.3.2 A Surveillance Approach (ASR) is one in
which a controller provides navigational guidance in
azimuth only. The pilot is furnished headings to fly to
align the aircraft with the extended centerline of the
landing runway. Since the radar information used for
a surveillance approach is considerably less precise
than that used for a precision approach, the accuracy
of the approach will not be as great, and higher
minimums will apply. Guidance in elevation is not
possible but the pilot will be advised when to
commence descent to the minimum descent altitude
(MDA) or, if appropriate, to an intermediate “step
down fix” minimum crossing altitude and subsequently
to the prescribed MDA. In addition, the pilot
will be advised of the location of the missed approach
point (MAP) prescribed for the procedure and the
aircrafts position each mile on final from the runway,
airport/heliport, or MAP, as appropriate. If requested
by the pilot, recommended altitudes will be issued at
each mile, based on the descent gradient established
for the procedure, down to the last mile that is at or
above the MDA. Normally, navigational guidance
will be provided until the aircraft reaches the MAP.
Controllers will terminate guidance and instruct the
pilot to execute a missed approach unless at the MAP
31 JULY 08
AIP ENR 1.5−41
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
the pilot has the runway, airport/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.
NOTE−
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.
2. ASR approaches are not available when an ATC facility
is using center radar arts presentation/ processing
(CENRAP).
14.3.3 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.
15. Radar Monitoring of Instrument
Approaches
15.1 PAR facilities operated by the FAA and the
military services at some joint−use (civil/military)
and military installations monitor aircraft on
instrument approaches and issue radar advisories to
the pilot when weather is below VFR minimum
(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
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