Federal Aviation Administration, DOT

Section 171.323

(4) There is an error in the time division multiplex synchronization of a
particular elevation function such that
the requirement specified in Section 171.311(e)
is not satisfied and this condition persists for more than one second.
(5) A failure of the monitor is detected.
(b) The period during which erroneous guidance information is radiated
must not exceed the periods specified
in Section 171.319(a). If the fault is not cleared
within the time allowed, radiation
shall cease. After shutdown, no attempt must be made to restore service
until a period of 20 seconds has elapsed.
Section 171.321 DME and marker beacon performance requirements.
(a) The DME equipment must meet
the performance requirements prescribed in subpart G of the part. This
subpart imposes requirements that performance features must comply with
International Standards and Recommended
Practices,
Aeronautical
Telecommunications, Vol. I of Annex
10 to ICAO. It is available from ICAO,
Aviation Building, 1080 University
Street, Montreal 101, Quebec, Canada,
Attention: Distribution Officer and
also available for inspection at the National Archives and Records Administration (NARA). For information on
the availability of this material at
NARA, call 202-741-6030, or go to: http://
www.archives.gov/federallregister/
codeloflfederallregulations/
ibrllocations.html.
(b) MLS marker beacon equipment
must meet the performance requirements prescribed in subpart H of this
part. This subpart imposes requirements that performance features must
comply with International Standards
and Recommended Practices, Aeronautical Telecommuncations, Vol. I of
Annex 10 to ICAO.
[Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as
amended at 69 FR 18803, Apr. 9, 2004]

Section 171.323 Fabrication and installation
requirements.
(a) The MLS facility must be permanent and must be located, constructed,
and installed in accordance with best
commercial
engineering
practices,
using applicable electric and safety
codes and Federal Communications

Commission (FCC) licensing requirements and siting requirements of
SectionSection 171.313(b) and 171.317(b).
(b) The MLS facility components
must utilize solid state technology except that traveling wave tube amplifiers (TWTA) may be used. A maximum
level of common modularity must be
provided along with diagnostics to facilitate maintenance and troubleshooting.
(c) An approved monitoring capability must be provided which indicates
the status of the equipment at the site
and at a remotely located maintenance
area, with monitor capability that provides pre-alarm of impending system
failures. This monitoring feature must
be capable of transmitting the status
and pre-alarm over standard phone
lines to a remote section. In the event
the sponsor requests the FAA to assume ownership of the facility, the
monitoring feature must also be capable of interfacing with FAA remote
monitoring requirements. This requirement may be complied with by the addition of optional software and/or hardware in space provided in the original
equipment.
(d) The mean corrective maintenance
time of the MLS equipment must be
equal to or less than 0.5 hours with a
maximum corrective maintenance time
not to exceed 1.5 hours. This measure
applies to correction of unscheduled
failures of the monitor, transmitter
and associated antenna assemblies,
limited to unscheduled outage and out
of tolerance conditions.
(e) The mean-time-between-failures
of the MLS angle system must not be
less than 1,500 hours. This measure applies to unscheduled outage, out-of-tolerance conditions, and failures of the
monitor, transmitter, and associated
antenna assemblies.
(f) The MLS facility must have a reliable source of suitable primary power,
either from a power distribution system or locally generated. Adequate
power capacity must be provided for
the operation of the MLS as well as the
test and working equipment of the
MLS.
(g) The MLS facility must have a
continuously engaged or floating battery power source for the continued
normal operation of the ground station

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