曝光台 注意防骗
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visibility minima, or 1/4 statue mile visibility/
1200 RVR, whichever is greater. No reduction in
MDA/DA is permitted. The reference for this is
14 CFR Section 97.3, Symbols and Terms used in
Procedures, (d−1). The helicopter may initiate the
final approach segment at speeds up to the upper limit
of the highest approach category authorized by the
procedure, but must be slowed to no more than
90 KIAS at the missed approach point (MAP) in
order to apply the visibility reduction. Pilots are
cautioned that such a decelerating approach may
make early identification of wind shear on the
approach path difficult or impossible. If required, use
the Inoperative Components and Visual Aids Table
provided in the front cover of the U.S. Terminal
Procedures Volume to derive the Category A minima
before applying the 14 CFR Section 97.3(d−1) rule.
2. Helicopters flying Copter SIAPs may use the
published minima, with no reductions allowed. The
maximum airspeed is 90 KIAS on any segment of the
approach or missed approach.
3. Helicopters flying GPS Copter SIAPs must
limit airspeed to 90 KIAS or less when flying any
segment of the procedure, except speeds must be
limited to no more than 70 KIAS on the final and
missed approach segments. Military GPS Copter
SIAPs are limited to no more than 90 KIAS
throughout the procedure. If annotated, holding may
also be limited to no more than 70 KIAS. Use the
published minima, no reductions allowed.
NOTE−
Obstruction clearance surfaces are based on the aircraft
speed and have been designed on these approaches for
70 knots. If the helicopter is flown at higher speeds, it may
fly outside of protected airspace. Some helicopters have a
VMINI greater than 70 knots; therefore, they cannot meet
the 70 knot limitation to conduct this type of procedure.
Some helicopter autopilots, when used in the “go−around”
mode, are programmed with a VYI greater than 70 knots,
therefore when using the autopilot “go−around” mode,
they cannot meet the 70 knot limitation to conduct this type
of approach. It may be possible to use the autopilot for the
missed approach in the other than the “go−around” mode
and meet the 70 knot limitation to conduct this type of
approach. When operating at speeds other than VYI or VY,
performance data may not be available in the RFM to
predict compliance with climb gradient requirements.
Pilots may use observed performance in similar
weight/altitude/temperature/speed conditions to evaluate
the suitability of performance. Pilots are cautioned to
monitor climb performance to ensure compliance with
procedure requirements.
4. TBL 10−1−1 summarizes these requirements.
5. Even with weather conditions reported at or
above landing minima, some combinations of
reduced cockpit cutoff angle, minimal approach/runway
lighting, and high MDA/DH coupled with a low
visibility minima, the pilot may not be able to identify
the required visual reference(s) during the approach,
or those references may only be visible in a very small
portion of the pilot’s available field of view. Even if
identified by the pilot, these visual references may not
support normal maneuvering and normal rates of
descent to landing. The effect of such a combination
may be exacerbated by other conditions such as rain
on the windshield, or incomplete windshield
defogging coverage.
6. Pilots are cautioned to be prepared to execute
a missed approach even though weather conditions
may be reported at or above landing minima.
NOTE−
See paragraph 5−4−20, Missed Approach, for additional
information on missed approach procedures.
AIM 2/17/05
10−1−4 Helicopter IFR Operations
TBL 10−1−1
Helicopter Use of Standard Instrument Approach Procedures
Procedure Helicopter Visibility
Minima
Helicopter MDA/DA Maximum Speed Limitations
Conventional
(non−Copter)
The greater of: one half
the Category A visibility
minima, 1/4 statute mile
visibility, or 1200 RVR
As published for
Category A
The helicopter may initiate the final
approach segment at speeds up to
the upper limit of the highest
Approach Category authorized by
the procedure, but must be slowed
to no more than 90 KIAS at the
MAP in order to apply the visibility
reduction.
Copter Procedure As published As published 90 KIAS when on a published
route/track.
GPS Copter Procedure As published As published 90 KIAS when on a published route
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