Section 171.101

14 CFR Ch. I (1-1-19 Edition)

Section 171.101 Scope.
This subpart sets forth minimum requirements for the approval and operation of non-Federal Simplified Directional Facilities (SDF) that are to be
involved in the approval of instrument
flight rules and air traffic control procedures related to those facilities.
Section 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 information with that request:
(1) A description of the facility and
evidence that the equipment meets the
performance requirements of Section 171.109
and the standards and tolerances of
Section 171.111, and is installed in accordance
with Section 171.113.
(2) A proposed procedure for operating the facility.
(3) A proposed maintenance organization and a maintenance manual that
meets the requirements of Section 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 reliability as prescribed in Section 171.111(k), and
an acceptable standard of performance.
Previous equivalent operational experience with a facility with identical design and operational characteristics
will be considered in showing compliance with this paragraph.
(b) After the Federal Aviation Administration 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 deficiencies, if any, and operate the facility for an in-service evaluation by the
Federal Aviation Administration.
Section 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 Facility:
(1) A suitable frequency channel
must be available.
(2) The facility-s performance, as determined by air and ground inspection,

must meet the requirements of
SectionSection 171.109 and 171.111.
(3) The installation of the equipment
must meet the requirements of
Section 171.113.
(4) The owner must agree to operate
and maintain the facility in accordance with Section 171.115.
(5) The owner must agree to furnish
periodic reports as set forth in Section 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 section and of any flight or ground inspections made before the facility is commissioned, except that the FAA may
bear certain 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 commissions the facility as a prerequisite to
its approval for use in an IFR procedure. 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 recommends cancellation or nonrenewal
of the Federal Communications Commission license whenever the frequency
channel is needed for higher priority
common system service.
Section 171.107

Definition.

As used in this subpart:
SDF (simplified directional facility)
means a directional aid facility providing only lateral guidance (front or
back course) for approach from a final
approach fix.
DDM (difference in depth of modulation) 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 corresponding angular displacement from
the appropriate reference line.

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