Federal Aviation Administration, DOT
Section 171.49

Section 171.51

Installation requirements.

(a) The facility must be of a permanent nature, located, constructed, and
installed according to ICAO Standards
(Annex 10), accepted good engineering
practices, applicable electric and safety codes, and FCC licensing requirements.
(b) The facility must have a reliable
source of suitable primary power, either from a power distribution system
or locally generated. A determination
by the Administrator as to whether a
facility will be required to have standby power for the localizer, glide slope
and monitor accessories to supplement
the primary power, will be made for
each airport based upon operational
minimums and density of air traffic.
(c) A determination by the Administrator as to whether a facility will be
required to have dual transmitting
equipment with automatic changeover
for localizer and glide slope components, will be made for each airport
based upon operational minimums and
density of air traffic.
(d) There must be a means for determining, from the ground, the performance of the equipment (including antennae), initially and periodically.
(e) The facility must have, or be supplemented by (depending on the circumstances) the following ground-air
or landline communications 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 ILS frequency should be determined by the facility operator on an
individual basis.
(2) At facilities within or immediately adjacent to controlled airspace,
there must be the ground-air communications required by paragraph (e)(1)
of this section and reliable communications (at least a landline telephone)
from the airport to the nearest FAA
air traffic control or communications
facility.
Paragraphs (e)(1) and (e)(2) of this section are not mandatory at airports
where an adjacent FAA 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
(e)(1) and (e)(2) of this section may be
reduced to reliable communications (at
least a landline telephone) from the
airport to the nearest FAA air traffic
control or communications facility, if
an adjacent FAA facility can communicate with aircraft during the proposed instrument approach procedure
down to the airport surface or at least
to the minimum approach altitude.
[Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as
amended by Amdt. 171-6, 35 FR 10288, June
24, 1970; Amdt. 171-16, 56 FR 65664, Dec. 17,
1991]

Section 171.51 Maintenance and operations
requirements.
(a) The owner of the facility must 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 must meet at least 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 owner must prepare, and obtain approval of, an operations and
maintenance manual that sets forth
mandatory procedures for operations,
preventive maintenance, and emergency maintenance, including instructions on each of the following:
(1) Physical security of the facility.
(2) Maintenance and operations by
authorized persons only.
(3) FCC licensing requirements for
operating and maintenance personnel.
(4) Posting of licenses and signs.
(5) Relation between the facility and
FAA air traffic control facilities, with
a description of the boundaries of controlled airspace over or near the facility, instructions for relaying air traffic
control instructions and information
(if applicable), and instructions for the
operations of an air traffic advisory
service if the facility is located outside
of controlled airspace.

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