[Code of Federal Regulations]

[Title 14, Volume 3]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR171.49]



[Page 223-224]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 

                               (CONTINUED)

 

PART 171_NON-FEDERAL NAVIGATION FACILITIES--Table of Contents

 

          Subpart C_Instrument Landing System (ILS) Facilities

 

Sec. 171.49  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 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 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 

perform- ance 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.



[[Page 224]]



    (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]