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Federal Aviation Administration, DOT 

§ 171.29 

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, 

§ 171.25

Minimum requirements for ap-


(a) The following are the minimum 

requirements that must be met before 
the FAA will approve an IFR procedure 
for a non-Federal, nondirectional radio 
beacon facility under this subpart: 

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

termined by air and ground inspection, 
must meet the requirements of § 171.27. 

(2) The installation of the equipment 

must meet the requirements of § 171.29. 

(3) The owner must agree to operate 

and maintain the facility in accord- 
ance with § 171.31. 

(4) The owner must agree to furnish 

periodic reports, as set forth in § 171.33, 
and agree to allow the FAA to inspect 
the facility and its operation whenever 

(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 The approval is withdrawn at any 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. In addition, 
the facility may be de-commissioned 
whenever the frequency channel is 
needed for higher priority common sys-
tem service. 

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

§ 171.27

Performance requirements. 

(a) The facility must meet the per-

formance requirements set forth in the 
‘‘International Standards and Rec-

ommended Practices, Aeronautical 
Telecommunications, Part I, paragraph 
3.4’’ (Annex 10 to the Convention on 
International Civil Aviation), except 
that identification by on-off keying of 
a second carrier frequency, separated 
from the main carrier by 1020 Hz plus 
or minus 50 Hz, is also acceptable. 

(b) The facility must perform in ac-

cordance with recognized and accepted 
good electronic engineering practices 
for the desired service. 

(c) Ground inspection consists of an 

examination of the design features of 
the equipment to determine (based on 
recognized and accepted good engineer-
ing practices) that there will not be 
conditions that will allow unsafe oper-
ations because of component failure or 

(d) Flight tests to determine the fa-

cility’s adequacy for operational re-
quirements and compliance with appli-
cable ‘‘Standards and Recommended 
Practices’’ are conducted in accord- 
ance with the ‘‘U.S. Standard Flight 
Inspection Manual’’, particularly sec-
tion 207. The original test is made by 
the FAA and later tests shall be made 
under arrangements, satisfactory to 
the FAA, that are made by the owner. 

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

§ 171.29

Installation requirements. 

(a) The facility must be installed ac-

cording to accepted good engineering 
practices, applicable electric and safe-
ty codes, and FCC licensing require-

(b) The facility must have a reliable 

source of suitable primary power. 

(c) Dual transmitting equipment may 

be required to support some IFR proce-

(d) A facility intended for use as an 

instrument approach aid for an airport 
must have or be supplemented by (de-
pending on the circumstances) the fol-
lowing ground-air or landline commu-
nications services: 

(1) At facilities outside of and not im-

mediately adjacent to controlled air-
space, there must be ground-air com-
munications from the airport served by 
the facility. Voice on the aid con-
trolled from the airport is acceptable. 

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