Code of Federal Regulations - Title 14

723

Federal Aviation Administration, DOT

§ 91.171

(B)

For a nonprecision approach proce-

dure. Ceiling 800 feet and visibility 2
statute miles.

(ii)

For helicopters: Ceiling 200 feet

above the minimum for the approach
to be flown, and visibility at least 1
statute mile but never less than the
minimum visibility for the approach to
be flown, and

(2) If no instrument approach proce-

dure has been published in part 97 of
this chapter and no special instrument
approach procedure has been issued by
the Administrator to the operator, for
the alternate airport, the ceiling and
visibility minima are those allowing
descent from the MEA, approach, and
landing under basic VFR.

(d)

Cancellation. When a flight plan

has been activated, the pilot in com-
mand, upon canceling or completing
the flight under the flight plan, shall
notify an FAA Flight Service Station
or ATC facility.

[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as
amended by Amdt. 91–259, 65 FR 3546, Jan. 21,
2000]

§ 91.171

VOR equipment check for IFR

operations.

(a) No person may operate a civil air-

craft under IFR using the VOR system
of radio navigation unless the VOR
equipment of that aircraft—

(1) Is maintained, checked, and in-

spected under an approved procedure;
or

(2) Has been operationally checked

within the preceding 30 days, and was
found to be within the limits of the
permissible indicated bearing error set
forth in paragraph (b) or (c) of this sec-
tion.

(b) Except as provided in paragraph

(1) Use, at the airport of intended de-

parture, an FAA-operated or approved
test signal or a test signal radiated by
a certificated and appropriately rated
radio repair station or, outside the
United States, a test signal operated or
approved by an appropriate authority
to check the VOR equipment (the max-
imum permissible indicated bearing
error is plus or minus 4 degrees); or

(2) Use, at the airport of intended de-

parture, a point on the airport surface

designated as a VOR system check-
point by the Administrator, or, outside
the United States, by an appropriate
authority (the maximum permissible
bearing error is plus or minus 4 de-
grees);

(3) If neither a test signal nor a des-

ignated checkpoint on the surface is
available, use an airborne checkpoint
designated by the Administrator or,
outside the United States, by an appro-
priate authority (the maximum per-
missible bearing error is plus or minus
6 degrees); or

(4) If no check signal or point is

available, while in flight—

(i) Select a VOR radial that lies

along the centerline of an established
VOR airway;

(ii) Select a prominent ground point

along the selected radial preferably
more than 20 nautical miles from the
VOR ground facility and maneuver the
aircraft directly over the point at a
reasonably low altitude; and

(iii) Note the VOR bearing indicated

by the receiver when over the ground
point (the maximum permissible vari-
ation between the published radial and
the indicated bearing is 6 degrees).

pendent of each other except for the
antenna) is installed in the aircraft,
the person checking the equipment
may check one system against the
other in place of the check procedures
specified in paragraph (b) of this sec-
tion. Both systems shall be tuned to
the same VOR ground facility and note
the indicated bearings to that station.
The maximum permissible variation
between the two indicated bearings is 4
degrees.

(d) Each person making the VOR

operational check, as specified in para-
graph (b) or (c) of this section, shall
enter the date, place, bearing error,
and sign the aircraft log or other
record. In addition, if a test signal ra-
diated by a repair station, as specified
in paragraph (b)(1) of this section, is
used, an entry must be made in the air-
craft log or other record by the repair
station certificate holder or the certifi-
cate holder’s representative certifying

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