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Federal Aviation Administration, DOT
§ 171.107
§ 171.101 Scope.
This subpart sets forth minimum re-
quirements for the approval and oper-
ation of non-Federal Simplified Direc-
tional Facilities (SDF) that are to be
involved in the approval of instrument
flight rules and air traffic control pro-
cedures related to those facilities.
§ 171.103 Requests for IFR procedure.
(a) Each person who requests an IFR
procedure based on an SDF that he
owns must submit the following infor-
mation with that request:
(1) A description of the facility and
evidence that the equipment meets the
performance requirements of § 171.109
and the standards and tolerances of
§ 171.111, and is installed in accordance
with § 171.113.
(2) A proposed procedure for oper-
ating the facility.
(3) A proposed maintenance organiza-
tion and a maintenance manual that
meets the requirements of § 171.115.
(4) A statement of intent to meet the
requirements of this subpart.
(5) A showing that the facility has an
acceptable level of operational reli-
ability as prescribed in § 171.111(k), and
an acceptable standard of performance.
Previous equivalent operational experi-
ence with a facility with identical de-
sign and operational characteristics
will be considered in showing compli-
ance with this paragraph.
(b) After the Federal Aviation Ad-
ministration inspects and evaluates
the facility, it advises the owner of the
results and of any required changes in
the facility or the maintenance manual
or maintenance organization. The
owner must then correct the defi-
ciencies, if any, and operate the facil-
ity for an in-service evaluation by the
Federal Aviation Administration.
§ 171.105 Minimum requirements for
approval.
(a) The following are the minimum
requirements that must be met before
the Federal Aviation Administration
will approve an IFR procedure for a
non-Federal Simplified Directional Fa-
cility:
(1) A suitable frequency channel
must be available.
(2) The facility’s performance, as de-
termined by air and ground inspection,
must meet the requirements of
§§ 171.109 and 171.111.
(3) The installation of the equipment
must meet the requirements of
§ 171.113.
(4) The owner must agree to operate
and maintain the facility in accord-
ance with § 171.115.
(5) The owner must agree to furnish
periodic reports as set forth in § 171.117,
and agree to allow the FAA to inspect
the facility and its operation whenever
necessary.
(6) The owner must assure the FAA
that he will not withdraw the facility
from service without the permission of
the FAA.
(7) 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 FAA may
bear certain of these costs subject to
budgetary limitations and policy estab-
lished 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 is licensed by the Federal
Communications Commission. The
Federal Aviation Administration rec-
ommends cancellation or nonrenewal
of the Federal Communications Com-
mission license whenever the frequency
channel is needed for higher priority
common system service.
§ 171.107 Definition.
As used in this subpart:
SDF
(simplified directional facility)
means a directional aid facility pro-
viding only lateral guidance (front or
back course) for approach from a final
approach fix.
DDM
(difference in depth of modula-
tion) means the percentage modulation
depth of the larger signal minus the
percentage modulation depth of the
smaller signal, divided by 100.
Angular displacement sensitivity
means
the ratio of measured DDM to the cor-
responding angular displacement from
the appropriate reference line.