849
Federal Aviation Administration, DOT
§ 171.273
or immediately adjacent to controlled
airspace, and where extensive delays
are not a factor, the requirements of
this paragraph may be reduced to reli-
able communications (at least a
landline telephone) from the airport to
the nearest Federal Aviation Adminis-
tration air traffic control or commu-
nications facility, if an adjacent Fed-
eral Aviation Administration facility
can communicate with aircraft during
the proposed instrument approach pro-
cedure, at least down to the minimum
en route altitude for the controlled
area.
(f) Except where no operationally
harmful interference will result, at lo-
cations where two separate ISMLS fa-
cilities serve opposite ends of a single
runway, an interlock must ensure that
only the facility serving the approach
direction in use can radiate.
[Doc. No. 14120, 40 FR 36110, Aug. 19, 1975, as
amended by Amdt. 171–16, 56 FR 65665, Dec.
17, 1991]
§ 171.273 Maintenance and operations
requirements.
(a) The owner of the facility must es-
tablish an adequate maintenance sys-
tem and provide qualified maintenance
personnel to maintain the facility at
the level attained at the time it was
commissioned. Each person who main-
tains a facility must meet at least the
Federal Communications Commission’s
licensing requirements and show that
he has the special knowledge and skills
needed to maintain the facility, includ-
ing proficiency in maintenance proce-
dures and the use of specialized test
equipment.
(b) In the event of out-of-tolerance
conditions or malfunctions, as evi-
denced by receiving two successive
pilot reports, the owner must close the
facility be ceasing radiation, and issue
a ‘‘Notice to Airman’’ (NOTAM) that
the facility is out of service.
(c) The owner must prepare, and ob-
tain approval of, an operations and
maintenance manual that sets forth
mandatory procedures for operations,
periodic maintenance, and emergency
maintenance, including instructions on
each of the following:
(1) Physical security of the facility.
(2) Maintenance and operations by
authorized persons.
(3) FCC licensing requirements for
operations and maintenance personnel.
(4) Posting of licenses and signs.
(5) Relation between the facility and
FAA air traffic control facilities, with
a description of the boundaries of con-
trolled airspace over or near the facil-
ity, instructions for relaying air traffic
control instructions and information,
if applicable, and instructions for the
operation of an air traffic advisory
service if the facility is located outside
of controlled airspace.
(6) Notice to the Administrator of
any suspension of service.
(7) Detailed and specific maintenance
procedures and servicing guides stating
the frequency of servicing.
(8) Air-ground communications, if
provided, expressly written or incor-
porating appropriate sections of FAA
manuals by reference.
(9) Keeping of station logs and other
technical reports, and the submission
of reports required by § 171.275.
(10) Monitoring of the ISMLS facil-
ity.
(11) Inspections by United States per-
sonnel.
(12) Names, addresses, and telephone
numbers of persons to be notified in an
emergency.
(13) Shutdowns for periodic mainte-
nance and issue of ‘‘Notices to Airmen’’
for routine or emergency shutdowns.
(14) Commissioning of the ISMLS fa-
cility.
(15) An acceptable procedure for
amending or revising the manual.
(16) An explanation of the kinds of
activities (such as construction or
grading) in the vicinity of the ISMLS
facility that may require shutdown or
recertification of the ISMLS facility
by FAA flight check.
(17) Procedures for conducting a
ground check of the localizer course
alignment, width, and clearance, glide
path elevation angle and course width,
and marker beacon power, and modula-
tion.
(18) The following information con-
cerning the ISMLS facility:
(i) Facility component locations with
respect to airport layout, instrument
runways, and similar areas.
(ii) The type, make, and model of the
basic radio equipment that provides
the service.
