Section 4. TPX-42
11-4-1. OPERATIONAL USE
a. Do not use TPX-42 data when the system is
released to Technical Operations technicians.
b. Verify the operational status of the TPX-42
prior to operational use.
c. Inform affected facilities of scheduled and
unscheduled shutdowns.
d. Develop local procedures, operating instructions, and training materials required to ensure
intrafacility standardization of operation.
e. Facility directives shall specify the discrete
codes assigned to each operating position from the
code subsets allocated to the facility.
f. Traffic entering the terminal airspace on an
ARTCC computer-assigned discrete beacon code
shall not remain on that code any longer than the time
specified in a LOA.
NOTE-
Center computer parameters are adjusted to minimize the
time in which a discrete code is assigned to an aircraft.
The time specified in the letter of agreement should not
exceed the Arrival Flight Plan Drop Interval adapted for
your airport.
11-4-2. LOW ALTITUDE ALERT SYSTEM
(LAAS)
a. When continued use would adversely impact
operational priorities, air traffic managers may
temporarily inhibit the LAAS. Except when
equipment or site adaptation problems preclude the
use of LAAS, a brief written report shall be sent to the
respective Terminal Operations Service Area Office
whenever it is inhibited. A copy of the report shall be
sent to System Operations and Safety, System Safety
and Procedures.
b. Air traffic managers are authorized to inhibit
LAAS at specific operating positions if an
operational advantage will be realized.
c. Sector/altitude maps shall be kept current.
d. Terminal Operations Service Area Offices
shall:
1. Furnish LAAS facilities a copy of:
(a) Newly received FAA Form 7460-2,
Notice of Actual Construction or Alteration.
(b) Emergency Notices of Construction of
structures more than 200 feet above ground level
lying within 60 NM of the radar site.
2. Ensure that the daily National Flight Data
Digest is provided to LAAS facilities when it affects
their area of jurisdiction.
e. Facility managers shall ensure that:
1. The material described in subpara d1 above,
is reviewed, and that the appropriate corrections to
the sector/altitude map are made.
2. The magnetic variation of the facility's
sector/altitude map coincides with the magnetic
variation of the facility's radar video maps/geo maps.
NOTE-
The sector/altitude map is constructed to align with the
radar antenna offset for magnetic north. Consequently,
any change in antenna offset will result in a corresponding
change in the relative position of the terrain points and the
obstacles used to determine altitude assignments. This
will require generating a new sector/altitude map.
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