Federal Aviation Administration, DOT
Section 171.255

Section 171.259

Requests for IFR procedures.

(a) Each person who requests an IFR
procedure based on an ISMLS facility
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 SectionSection 171.259,
171.261, 171.263, 171.265, 171.267, and
171.269, and is installed in accordance
with Section 171.271.
(2) A proposed procedure for operating the facility.
(3) A proposed maintenance organization and a maintenance manual that
meets the requirements of Section 171.273.
(4) A statement of intent to meet the
requirements of this subpart.
(5) A showing that the ISMLS facility has an acceptable level of operational reliability, maintainability and
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 FAA inspects and evaluates the ISMLS facility, it advises the
owner of the results and of any required changes in the ISMLS facility
or in the maintenance manual or maintenance organization. The owner must
then correct the deficiencies, if any,
and operate the ISMLS facility for an
inservice evaluation by the FAA.
Section 171.257 Minimum
approval.

requirements

for

(a) The following are the minimum
requirements that must be met before
the FAA approves an IFR procedure for
a non-Federal ISMLS facility:
(1) The performance of the ISMLS facility, as determined by flight and
ground inspection conducted by the
FAA, must meet the requirements of
SectionSection 171.259, 171.261, 171.263, 171.265, 171.267,
and 171.269.
(2) The installation of the equipment
must meet the requirements of
Section 171.271.
(3) The owner must agree to operate
and maintain the ISMLS facility in accordance with Section 171.273.
(4) The owner must agree to furnish
periodic reports as set forth in Section 171.275
and agree to allow the FAA to inspect

the facility and its operation whenever
necessary.
(5) The owner must assure the FAA
that he will not withdraw the ISMLS
facility from service without the permission of the FAA.
(6) The owner must bear all costs of
meeting the requirements of this section and of any flight or ground inspection made before the ISMLS facility is
commissioned, except that the FAA
may bear certain 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 approves
the ISMLS facility for use in an IFR
procedure. The approval is withdrawn
at any time that the ISMLS facility
does not continue to meet those requirements. In addition, the ISMLS facility may be de-commissioned whenever the frequency channel is needed
for higher priority common system
service.
Section 171.259 Performance
requirements:
General.
(a) The ISMLS consists of the following basic components:
(1) C-Band (5000 MHz-5030 MHz) localizer equipment, associated monitor
system, and remote indicator equipment;
(2) C-Band (5220 MHz-5250 MHz) glide
path equipment, associated monitor
system, and remote indicator equipment;
(3) VHF marker beacons (75 MHz), associated monitor systems, and remote
indicator equipment.
(4) An ISMLS airborne receiver or a
VHF/UHF ILS receiver modified to be
capable of receiving the ISMLS signals.
This modification requires the addition
of a C-Band antenna, a converter unit,
a microwave/ILS mode control, and a
VHF/UHF receiver modification kit.
(b) The electronic ground equipments
in paragraph (a)(1), (2), and (3) of this
section, must be designed to operate on
a nominal 120/240 volt, 60 Hz, 3-wire single phase AC power source.
(c) ISMLS ground equipment must
meet the following service conditions:
(1) AC line parameters, DC voltage,
elevation, and duty:
120 V nominal value, 102 V to 138 V (Section1 V).*

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