[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: 14CFR171.47]



[Page 223]

 

                     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. 171.47  Performance requirements.



    (a) The Instrument Landing System must perform in accordance with 

the ``International Standards and Recommended Practices, Aeronautical 

Telecommunications, Part I, Paragraph 3.1'' (Annex 10 to the Convention 

on International Civil Aviation) except as follows:

    (1) The first part of paragraph 3.1.3, relating to suppression of 

radiation wholly or in part in any or all directions outside the 20-

degree sector centered on the course line to reduce local izer does not 

apply.

    (2) Radiation patterns must conform to limits specified in 3.1.3.3 

and 3.1.3.4, but this does not mean that suppression of radiation to the 

rear of the antenna array to satisfy difficult siting positions (as per 

3.1.3.1.4) is not allowed. For example, if a reflector screen for the 

antenna array is required to overcome a siting problem, the area to the 

rear of the localizer may be made unusable and should be so advertised.

    (3) A third marker beacon (inner marker) is not required.

    (4) The frequency tolerance of the radio frequency carrier must not 

exceed plus or minus 0.002 percent.

    (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 component failure or 

deterioration.

    (c) The monitor is checked periodically, during the in-service test 

evaluation period, for calibration and stability. These tests, and 

ground checks of glide slope and localizer radiation characteristics, 

are conducted in accordance with FAA Handbooks AF P 6750.1 and AF P 

6750.2 ``Maintenance Instructions for ILS Localizer Equipment'' and 

``Maintenance Instructions for ILS Glide Slope Equipment''.

    (d) Flight tests to determine the facility's adequacy for 

operational requirements and compliance with applicable ``Standards and 

Recommended Practices'' are conducted in accord- ance with the ``U.S. 

Standard Flight Inspection Manual'', particularly section 217.



[Doc. No. 5034, 29 FR 11337, Aug. 6, 1974, as amended by Amdt. 171-9, 38 

FR 28557, Oct. 15, 1973]