804 

14 CFR Ch. I (1–1–19 Edition) 

§ 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 

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