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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.
NOTEObstruction
clearance surfaces are based on the aircraft
speed and have been designed on these approaches for
70knots. 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.
NOTESee
paragraph 5-4-21, Missed Approach, for additional
information on missed approach procedures.
AIM 2/14/08
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
CategoryA
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
or track, EXCEPT 70 KIAS when
on the final approach or missed
approach segment and, if annotated,
in holding. Military procedures are
limited to 90 KIAS for all segments.
NOTESeveral
factors effect the ability of the pilot to acquire and
maintain the visual references specified in 14 CFR
Section91.175(c), even in cases where the flight visibility
may be at the minimum derived by TBL 10-1-1. These
factors include, but are not limited to:
1. Cockpit cutoff angle (the angle at which the cockpit or
other airframe structure limits downward visibility below
the horizon).
2. Combinations of high MDA/DH and low visibility
minimum, such as a conventional nonprecision approach
with a reduced helicopter visibility minima (per 14 CFR
Section 97.3).
3. Type, configuration, and intensity of approach and
　
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