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824 

14 CFR Ch. I (1–1–24 Edition) 

§ 171.49 

§ 171.49 Installation requirements. 

(a) The facility must be of a perma-

nent nature, located, constructed, and 
installed according to ICAO Standards 
(Annex 10), accepted good engineering 
practices, applicable electric and safe-
ty codes, and FCC licensing require-
ments. 

(b) The facility must have a reliable 

source of suitable primary power, ei-
ther from a power distribution system 
or locally generated. A determination 
by the Administrator as to whether a 
facility will be required to have stand- 
by 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 Adminis-

trator as to whether a facility will be 
required to have dual transmitting 
equipment with automatic changeover 
for localizer and glide slope compo-
nents, will be made for each airport 
based upon operational minimums and 
density of air traffic. 

(d) There must be a means for deter-

mining, from the ground, the perform- 
ance of the equipment (including an-
tennae), initially and periodically. 

(e) The facility must have, or be sup-

plemented by (depending on the cir-
cumstances) the following ground-air 
or landline communications services: 

(1) At facilities outside of and not im-

mediately adjacent to controlled air-
space, there must be ground-air com-
munications from the airport served by 
the facility. The utilization of voice on 
the ILS frequency should be deter-
mined by the facility operator on an 
individual basis. 

(2) At facilities within or imme-

diately adjacent to controlled airspace, 
there must be the ground-air commu-
nications required by paragraph (e)(1) 
of this section and reliable communica-
tions (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 sec-
tion 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 fac-
tor, 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 commu-
nicate with aircraft during the pro-
posed 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] 

§ 171.51 Maintenance and operations 

requirements. 

(a) The owner of the facility must es-

tablish an adequate maintenance sys-
tem and provide qualified maintenance 
personnel to maintain the facility at 
the level attained at the time it was 
commissioned. Each person who main-
tains 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 includ-
ing proficiency in maintenance proce-
dures and the use of specialized test 
equipment. 

(b) The owner must prepare, and ob-

tain approval of, an operations and 
maintenance manual that sets forth 
mandatory procedures for operations, 
preventive maintenance, and emer-
gency maintenance, including instruc-
tions 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 con-
trolled airspace over or near the facil-
ity, 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.