Federal Aviation Administration, DOT

Section 171.115

(3) A final approach fix; and
(4) Compass locator (COMLO) or
marker if suitable fixes and initial approach routes are not available from
existing facilities.
(c) The facility must have a reliable
source of suitable primary power, either from a power distribution system
or locally generated. Also, adequate
power capacity must be provided for
operation of test and working equipment at the SDF. A determination by
the Federal Aviation Administration
as to whether a facility will be required
to have standby power for the SDF and
monitor accessories to supplement the
primary power will be made for each
airport based upon operational minimums and density of air traffic.
(d) A determination by the Federal
Aviation Administration as to whether
a facility will be required to have dual
transmitting equipment with automatic changeover for the SDF will be
made for each airport based upon operational minimums and density of air
traffic.
(e) There must be a means for determining, from the ground, the performance of the equipment (including antennae), initially and periodically.
(f) The facility must have the following ground-air or landline communication services:
(1) At facilities outside of and not immediately adjacent to controlled airspace, there must be ground-air communications from the airport served by
the facility. The utilization of voice on
the SDF should be determined by the
facility operator on an individual basis.
(2) At facilities within or immediately adjacent to controlled airspace,
there must be ground/air communications required by paragraph (b)(1) of
this section and reliable communications (at least a landline telephone)
from the airport to the nearest Federal
Aviation Administration air traffic
control or communications facility.
Compliance with paragraphs (f) (1) and
(2) of this section need not be shown at
airports where an adjacent Federal
Aviation Administration facility can
communicate with aircraft on the
ground at the airport and during the
entire proposed instrument approach
procedure. In addition, at low traffic
density airports within or immediately

adjacent to controlled airspace, and
where extensive delays are not a factor, the requirements of paragraphs (f)
(1) and (2) of this section may be reduced to reliable communications (at
least a landline telephone) from the
airport to the nearest Federal Aviation
Administration air traffic control or
communications facility, if an adjacent
Federal Aviation Administration facility can communicate with aircraft during the proposed instrument approach
procedure down to the airport surface
or at least down to the minimum approach altitude.
(g) At those locations where two separate SDF facilities serve opposite
ends of a single runway, an interlock
must insure that only the facility serving the approach direction in use can
radiate, except where no operationally
harmful interference results.
(h) At those locations where, in order
to alleviate frequency congestion, the
SDF facilities serving opposite ends of
one runway employ identical frequencies, an interlock must insure that
the facility not in operational use cannot radiate.
(i) Provisions for maintenance and
operations by authorized persons only.
(j) Where an operational advantage
exists, the installation may omit a
back course.
[Doc. No. 10116, 35 FR 12711, Aug. 11, 1970, as
amended by Amdt. 171-16, 56 FR 65664, Dec.
17, 1991]

Section 171.115 Maintenance and operations
requirements.
(a) The owner of the facility shall establish an adequate maintenance system and provide qualified maintenance
personnel to maintain the facility at
the level attained at the time it was
commissioned. Each person who maintains a facility shall meet at a minimum the Federal Communications
Commission-s licensing requirements
and show that he has the special
knowledge and skills needed to maintain the facility, including proficiency
in maintenance procedures and the use
of specialized test equipment.
(b) The SDF must be designed and
maintained so that the probability of
operation within the performance requirements specified is high enough to
insure an adequate level of safety. In

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