曝光台 注意防骗
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runway or flying in the vicinity of the airport.
g. Instrument Approach at a Military Field.
When instrument approaches are conducted by civil
aircraft at military airports, they shall be conducted in
accordance with the procedures and minimums
approved by the military agency having jurisdiction
over the airport.
5−4−20. Missed Approach
a. When a landing cannot be accomplished, advise
ATC and, upon reaching the missed approach point
defined on the approach procedure chart, the pilot
must comply with the missed approach instructions
for the procedure being used or with an alternate
missed approach procedure specified by ATC.
b. Protected obstacle clearance areas for missed
approach are predicated on the assumption that the
missed approach is initiated at the decision
height (DH) or at the missed approach point and not
lower than minimum descent altitude (MDA). A
climb of at least 200 feet per nautical mile is required,
(except for Copter approaches, where a climb of at
least 400 feet per nautical mile is required), unless a
higher climb gradient is published on the approach
chart. Reasonable buffers are provided for normal
maneuvers. However, no consideration is given to an
abnormally early turn. Therefore, when an early
missed approach is executed, pilots should, unless
otherwise cleared by ATC, fly the IAP as specified on
the approach plate to the missed approach point at or
above the MDA or DH before executing a turning
maneuver.
c. If visual reference is lost while circling-to-land
from an instrument approach, the missed approach
specified for that particular procedure must be
followed (unless an alternate missed approach
procedure is specified by ATC). To become
established on the prescribed missed approach
course, the pilot should make an initial climbing turn
toward the landing runway and continue the turn until
established on the missed approach course. Inasmuch
as the circling maneuver may be accomplished in
more than one direction, different patterns will be
required to become established on the prescribed
missed approach course, depending on the aircraft
position at the time visual reference is lost.
Adherence to the procedure will assure that an
aircraft will remain within the circling and missed
approach obstruction clearance areas.
(See FIG 5−4−21.)
d. At locations where ATC radar service is
provided, the pilot should conform to radar vectors
when provided by ATC in lieu of the published
missed approach procedure. (See FIG 5−4−22.)
e. When approach has been missed, request
clearance for specific action; i.e., to alternative
airport, another approach, etc.
AIM 2/17/05
5−4−44 Arrival Procedures
FIG 5−4−21
Circling and Missed Approach Obstruction Clearance Areas
X
X
CLIMBING TURN
CLIMBING TURN
DECISION TO MISS
HERE
DECISION
TO MISS HERE
VOR
VOR
CIRCLING
MANEUVER
(WHEN
CLEARED IN
RIGHT HAND
TRAFFIC
PATTERN)
FIG 5−4−22
Missed Approach
x
CHANUTE
109.2 CNU
090°
1450 1265
1581
1180
1172
Portion of a Published Procedure
Remain within
10 NM
VOR
MISSED APPROACH
Climbing right turn to
2600 2600 direct to VOR
236°
056°
2500
5.7 NM
R236
056°
011°
191°
2/17/05 AIM
Arrival Procedures 5−4−45
f. Pilots must ensure that they have climbed to a
safe altitude prior to proceeding off the published
missed approach, especially in nonradar environments.
Abandoning the missed approach prior to
reaching the published altitude may not provide
adequate terrain clearance. Additional climb may be
required after reaching the holding pattern before
proceeding back to the IAF or to an alternate.
g. Missed approach obstacle clearance is predicated
on beginning the missed approach procedure at
the Missed Approach Point (MAP) from MDA or DA
and then climbing 200 feet/NM or greater. Initiating
a go−around after passing the published MAP may
result in total loss of obstacle clearance. To
compensate for the possibility of reduced obstacle
clearance during a go−around, a pilot should apply
procedures used in takeoff planning. Pilots should
refer to airport obstacle and departure data prior to
initiating an instrument approach procedure. Such
information may be found in the “TAKE−OFF
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