725
Federal Aviation Administration, DOT
§ 91.175
(2) Whenever an identifiable part of
the airport is not distinctly visible to
the pilot during a circling maneuver at
or above MDA, unless the inability to
see an identifiable part of the airport
results only from a normal bank of the
aircraft during the circling approach.
(f)
Civil airport takeoff minimums. This
paragraph applies to persons operating
an aircraft under part 121, 125, 129, or
135 of this chapter.
(1) Unless otherwise authorized by
the FAA, no pilot may takeoff from a
civil airport under IFR unless the
weather conditions at time of takeoff
are at or above the weather minimums
for IFR takeoff prescribed for that air-
port under part 97 of this chapter.
(2) If takeoff weather minimums are
not prescribed under part 97 of this
chapter for a particular airport, the
following weather minimums apply to
takeoffs under IFR:
(i) For aircraft, other than heli-
copters, having two engines or less—1
statute mile visibility.
(ii) For aircraft having more than
two engines—
1
⁄
2
statute mile visibility.
(iii) For helicopters—
1
⁄
2
statute mile
visibility.
(3) Except as provided in paragraph
(f)(4) of this section, no pilot may take-
off under IFR from a civil airport hav-
ing published obstacle departure proce-
dures (ODPs) under part 97 of this
chapter for the takeoff runway to be
used, unless the pilot uses such ODPs
or an alternative procedure or route as-
signed by air traffic control.
(4) Notwithstanding the requirements
of paragraph (f)(3) of this section, no
pilot may takeoff from an airport
under IFR unless:
(i) For part 121 and part 135 opera-
tors, the pilot uses a takeoff obstacle
clearance or avoidance procedure that
ensures compliance with the applicable
airplane performance operating limita-
tions requirements under part 121, sub-
part I or part 135, subpart I for takeoff
at that airport; or
(ii) For part 129 operators, the pilot
uses a takeoff obstacle clearance or
avoidance procedure that ensures com-
pliance with the airplane performance
operating limitations prescribed by the
State of the operator for takeoff at
that airport.
(g)
Military airports. Unless otherwise
prescribed by the Administrator, each
person operating a civil aircraft under
IFR into or out of a military airport
shall comply with the instrument ap-
proach procedures and the takeoff and
landing minimum prescribed by the
military authority having jurisdiction
of that airport.
(h)
Comparable values of RVR and
ground visibility. (1) Except for Category
II or Category III minimums, if RVR
minimums for takeoff or landing are
prescribed in an instrument approach
procedure, but RVR is not reported for
the runway of intended operation, the
RVR minimum shall be converted to
ground visibility in accordance with
the table in paragraph (h)(2) of this sec-
tion and shall be the visibility min-
imum for takeoff or landing on that
runway.
(2)
RVR (feet)
Visibility
(statute
miles)
1,600 ..................................................................
1
⁄
4
2,400 ..................................................................
1
⁄
2
3,200 ..................................................................
5
⁄
8
4,000 ..................................................................
3
⁄
4
4,500 ..................................................................
7
⁄
8
5,000 ..................................................................
1
6,000 ..................................................................
1
1
⁄
4
(i)
Operations on unpublished routes
and use of radar in instrument approach
procedures. When radar is approved at
certain locations for ATC purposes, it
may be used not only for surveillance
and precision radar approaches, as ap-
plicable, but also may be used in con-
junction with instrument approach
procedures predicated on other types of
radio navigational aids. Radar vectors
may be authorized to provide course
guidance through the segments of an
approach to the final course or fix.
When operating on an unpublished
route or while being radar vectored,
the pilot, when an approach clearance
is received, shall, in addition to com-
plying with § 91.177, maintain the last
altitude assigned to that pilot until the
aircraft is established on a segment of
a published route or instrument ap-
proach procedure unless a different al-
titude is assigned by ATC. After the
aircraft is so established, published al-
titudes apply to descent within each
succeeding route or approach segment
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