[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: 14CFR171.113]



[Page 231-232]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 

                               (CONTINUED)

 

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

 

             Subpart F_Simplified Directional Facility (SDF)

 

Sec. 171.113  Installation requirements.



    (a) The facility must be installed according to accepted good 

engineering practices, applicable electric and safety codes, and FCC 

requirements.

    (b) The SDF facility must have the following basic components:

    (1) VHF SDF equipment and associated monitor system;

    (2) Remote control, and indicator equipment (remote monitor) when 

required by the FAA;

    (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 automa tic 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:



[[Page 232]]



    (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]