815 

Federal Aviation Administration, DOT 

§ 171.1 

Subpart B—Nondirectional Radio Beacon 

Facilities 

171.21

Scope. 

171.23

Requests for IFR procedure. 

171.25

Minimum requirements for approval. 

171.27

Performance requirements. 

171.29

Installation requirements. 

171.31

Maintenance and operations require-

ments. 

171.33

Reports. 

Subpart C—Instrument Landing System 

(ILS) Facilities 

171.41

Scope. 

171.43

Requests for IFR procedure. 

171.45

Minimum requirements for approval. 

171.47

Performance requirements. 

171.49

Installation requirements. 

171.51

Maintenance and operations require-

ments. 

171.53

Reports. 

Subpart D—True Lights 

171.61

Air navigation certificate: Revoca-

tion and termination. 

Subpart E—General 

171.71

Materials incorporated by reference. 

171.73

Alternative forms of reports. 

171.75

Submission of requests. 

Subpart F—Simplified Directional Facility 

(SDF) 

171.101

Scope. 

171.103

Requests for IFR procedure. 

171.105

Minimum requirements for approval. 

171.107

Definition. 

171.109

Performance requirements. 

171.111

Ground standards and tolerances. 

171.113

Installation requirements. 

171.115

Maintenance and operations require-

ments. 

171.117

Reports. 

Subpart G—Distance Measuring Equipment 

(DME) 

171.151

Scope. 

171.153

Requests for IFR procedure. 

171.155

Minimum requirements for approval. 

171.157

Performance requirements. 

171.159

Installation requirements. 

171.161

Maintenance and operations require-

ments. 

171.163

Reports. 

Subpart H—VHF Marker Beacons 

171.201

Scope. 

171.203

Requests for IFR procedure. 

171.205

Minimum requirements for approval. 

171.207

Performance requirements. 

171.209

Installation requirements. 

171.211

Maintenance and operations require-

ments. 

171.213

Reports. 

Subpart I—Interim Standard Microwave 

Landing System (ISMLS) 

171.251

Scope. 

171.253

Definitions. 

171.255

Requests for IFR procedures. 

171.257

Minimum requirements for approval. 

171.259

Performance requirements: General. 

171.261

Localizer performance requirements. 

171.263

Localizer automatic monitor sys-

tem. 

171.265

Glide path performance require-

ments. 

171.267

Glide path automatic monitor sys-

tem. 

171.269

Marker beacon performance require-

ments. 

171.271

Installation requirements. 

171.273

Maintenance and operations require-

ments. 

171.275

Reports. 

Subpart J—Microwave Landing System 

(MLS) 

171.301

Scope. 

171.303

Definitions. 

171.305

Requests for IFR procedure. 

171.307

Minimum requirements for approval. 

171.309

General requirements. 

171.311

Signal format requirements. 

171.313

Azimuth performance requirements. 

171.315

Azimuth monitor system require-

ments. 

171.317

Approach elevation performance re-

quirements. 

171.319

Approach elevation monitor system 

requirements. 

171.321

DME and marker beacon perform-

ance requirements. 

171.323

Fabrication and installation require-

ments. 

171.325

Maintenance and operations require-

ments. 

171.327

Operational records. 

A

UTHORITY

: 49 U.S.C. 106(g), 40103–40107, 

40109, 40113, 44502, 44701–44702, 44708–44709, 
44711, 44719–44721, 45303, 46308. 

S

OURCE

: Docket No. 5034, 29 FR 11337, Aug. 

6, 1964, unless otherwise noted. 

Subpart A—VOR Facilities 

§ 171.1 Scope. 

This subpart sets forth minimum re-

quirements for the approval and oper-
ation on non-Federal VOR facilities 
that are to be involved in the approval 

816 

14 CFR Ch. I (1–1–24 Edition) 

§ 171.3 

of instrument flight rules and air traf-
fic control procedures related to those 
facilities. 

[Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as 
amended by Amdt. 171–2, 31 FR 5408, Apr. 6, 
1966; Amdt. 171–7, 35 FR 12711, Aug. 11, 1970] 

§ 171.3 Requests for IFR procedure. 

(a) Each person who requests an IFR 

procedure based on a VOR facility that 
he owns must submit the following in-
formation with that request: 

(1) A description of the facility and 

evidence that the equipment meets the 
performance requirements of § 171.7 and 
is installed in accordance with § 171.9. 

(2) A proposed procedure for oper-

ating the facility. 

(3) A proposed maintenance organiza-

tion and maintenance manual that 
meets the requirements of § 171.11. 

(4) A statement of intention to meet 

the requirements of this subpart. 

(5) A showing that the facility has an 

acceptable level of operational reli-
ability and an acceptable standard of 
performance. Previous equivalent oper-
ational experience with a facility with 
identical design and operational char-
acteristics will be considered in show-
ing compliance with this paragraph. 

(b) After the FAA inspects and evalu-

ates the facility, it advises the owner 
of the results and of any required 
changes in the facility or the mainte-
nance manual or maintenance organi-
zation. The owner must then correct 
the deficiencies, if any, and operate the 
facility for an in-service evaluation by 
the FAA. 

[Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as 
amended by Amdt. 171–7, 35 FR 12711, Aug. 11, 
1970] 

§ 171.5 Minimum requirements for ap-

proval. 

(a) The following are the minimum 

requirements that must be met before 
the FAA will approve an IFR procedure 
for a non-Federal VOR: 

(1) The facility’s performance, as de-

termined by air and ground inspection, 
must meet the requirements of § 171.7. 

(2) The installation of the equipment 

must meet the requirements of § 171.9. 

(3) The owner must agree to operate 

and maintain the facility in accord- 
ance with § 171.11. 

(4) The owner must agree to furnish 

periodic reports, as set forth in § 171.13, 
and must agree to allow the FAA to in-
spect the facility and its operation 
whenever necessary. 

(5) The owner must assure the FAA 

that he will not withdraw the facility 
from service without the permission of 
the FAA. 

(6) The owner must bear all costs of 

meeting the requirements of this sec-
tion and of any flight or ground inspec-
tions made before the facility is com-
missioned, except that the Federal 
Aviation Administration may bear cer-
tain of these costs subject to budgetary 
limitations and policy established by 
the Administrator. 

(b) If the applicant for approval 

meets the requirements of paragraph 
(a) of this section, the FAA commis-
sions the facility as a prerequisite to 
its approval for use in an IFR proce-
dure. The approval is withdrawn at any 
time the facility does not continue to 
meet those requirements. 

[Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as 
amended by Amdt. 171–6, 35 FR 10288, June 
24, 1970] 

§ 171.7 Performance requirements. 

(a) The VOR must perform in accord-

ance with the ‘‘International Stand-
ards and Recommended Practices, 
Aeronautical Telecommunications,’’ 
Part I, paragraph 3.3 (Annex 10 to the 
Convention on International Civil 
Aviation), except that part of para-
graph 3.3.2.1 specifying a radio fre-
quency tolerance of 0.005 percent, and 
that part of paragraph 3.3.7 requiring 
removal of only the bearing informa-
tion. In place thereof, the frequency 
tolerance of the radio frequency carrier 
must not exceed plus or minus 0.002 
percent, and all radiation must be re-
moved during the specified deviations 
from established conditions and during 
periods of monitor failure. 

(b) Ground inspection consists of an 

examination of the design features of 
the equipment to determine that there 
will not be conditions that will allow 
unsafe operations because of compo-
nent failure or deterioration.