736 

14 CFR Ch. I (1–1–19 Edition) 

§ 91.175 

(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 

RVR (feet) 

Visibility 

(statute 

miles) 

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 
unless a different altitude is assigned 
by ATC. Upon reaching the final ap-
proach course or fix, the pilot may ei-
ther complete the instrument approach 
in accordance with a procedure ap-
proved for the facility or continue a 
surveillance or precision radar ap-
proach to a landing. 

(j) 

Limitation on procedure turns. 

In 

the case of a radar vector to a final ap-
proach course or fix, a timed approach 
from a holding fix, or an approach for 
which the procedure specifies ‘‘No PT,’’ 
no pilot may make a procedure turn 
unless cleared to do so by ATC. 

(k) 

ILS components. 

The basic compo-

nents of an ILS are the localizer, glide 
slope, and outer marker, and, when in-
stalled for use with Category II or Cat-
egory III instrument approach proce-
dures, an inner marker. The following 
means may be used to substitute for 
the outer marker: Compass locator; 
precision approach radar (PAR) or air-
port surveillance radar (ASR); DME, 
VOR, or nondirectional beacon fixes 
authorized in the standard instrument 
approach procedure; or a suitable 

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