Section 9. Safety Logic Systems Front-Line Manager/CIC Procedures
11-9-1. SYSTEM
OPERATION
a. Safety Logic
Systems are software enhancements to the ASDE-3 and ASDE-X that predict the
path of aircraft landing and/or departing, and/or vehicular movements on
runways. Visual and aural alerts are activated when the safety logic
projects a potential collision.
1. AMASS is a
safety logic system enhancement to the ASDE-3.
2. ASDE-X
Safety Logic is a system enhancement to ASDE-X.
b. The Safety
Logic System shall be operated in a full core alert runway configuration.
(In ASDE X, when rain configuration is selected, it includes full core
alerting capabilities.)
c. When ASDE-3
and/or AMASS is in maintenance mode, AMASS data shall be considered invalid
and the system shall be taken offline. The front-line manager/CIC shall
validate, upon resumption of normal AMASS operations, that runway
configurations and other user settings are adequate for operational use.
NOTE-
Action to change AMASS online/offline status is a Technical Operations
function. ASDE-X safety logic will automatically be disabled when the system
is in maintenance mode.
d. When a
runway becomes unavailable for aircraft operations for an extended period of
time, the runway should be entered as, "Closed" in the Safety Logic System.
Facility procedures should be developed to address using the Safety Logic
System in this capacity.
e. Construction
projects in the vicinity of runways may cause nuisance or false alerts. The
National Airway Systems Engineering (NASE) group may be able to provide an
adaptation to filter the affected areas from Safety Logic System coverage.
Facilities shall contact NASE via email at either 9-AMC-ATOW-ASDE-X@faa.gov
or 9-AMC-AOS-AMASS@faa.gov, 30 to 45 days before the construction is
scheduled to begin to assist in determining whether an adaptation is
necessary.
f. ASDE-X false
targets may be temporarily track dropped after positive verification has
been accomplished via pilot/vehicle operator position report or controller
visual observation. When a false target is temporarily dropped, it shall be
noted on FAA Form 7230-4, Daily Record of Facility Operation.
REFERENCE-
FAAO JO 7110.65, Para 3-6-2, Identification.
g. The Air
Traffic Manager may authorize a real target to be inhibited from safety
logic processing when the target will likely generate a nuisance alert.
11-9-2. ENSURE STATUS
a. The
front-line manager/CIC is responsible for ensuring that the Safety Logic
System is set for the correct runway configuration.
b. The
front-line manager/CIC shall ensure that the operational status of the
Safety Logic System is known to all operational personnel.
c. When a
status change is made to the Safety Logic System all personnel assigned an
operational position shall be notified verbally.
d. When any
status change is made to the Safety Logic System it shall be noted on FAA
Form 7230-4, Daily Record of Facility Operation. Such status shall be shown
in the facility Status Information Area (SIA). The front-line manager/CIC
shall ensure that all outages are carried over on applicable logs.
11-9-3. MONITOR
ALERTS AND ENSURE CORRECTIVE ACTION
a. The
front-line manager/CIC shall ensure that the Safety Logic System is
monitored and all alerts are complied with.
b. All Safety
Logic System alerts generated shall be documented on FAA Form 7230-4. If
unable to determine the origin of an alert, treat the alert as false and
notify Technical Operations so that corrective action can be taken.
c. The purpose
of logging Safety Logic System alerts is to track the reliability and
performance of the system. Therefore, the Quality Assurance Review (QAR)
process shall not be used for false or nuisance alerts.
REFERENCE-
Pilot/Controller Glossary Term- Safety Logic System Alerts.
11-9-4. RAIN
CONFIGURATION
a. Due to the
required sensitivity of surface movement radars, numerous false targets may
be generated by moderate to extreme precipitation. During these periods the
ASDE-X and AMASS Safety Logic Systems should be operated in rain
configuration. Should precipitation of this magnitude occur or be imminent,
rain configuration may be applied to avoid the likelihood of false alerts.
b. When the
event that led to placing the system into rain configuration is no longer a
factor, the Safety Logic System must be reset to a normal configuration.
NOTE-
When AMASS is in rain configuration all safety logic alerts with the
exception of arrivals to a closed runway are inhibited and AMASS is not in
full core alert status.
11-9-5. LIMITED
CONFIGURATION
a. Under
certain circumstances, there may be a need to operate the Safety Logic
System in limited configuration. The limited configuration shall only be
used to temporarily inhibit persistent false alerts. The term "persistent
false alert" refers to frequent false alerts caused by continuous or
repetitive circumstances. False alerts caused by random events or
circumstances of short duration are not considered "persistent false
alerts." The determination of "persistent alerts" is at the discretion of
each front-line manager/CIC.
b. Due to the
required sensitivity of surface movement radars, numerous false targets may
be caused by precipitation of moderate or greater intensity. Should
precipitation of this magnitude occur or be imminent at locations where ASDE
does not have rain configuration availability, limited configuration may be
applied to avoid the likelihood of false alerts.
c. When it is
necessary to operate the ASDE-X Safety Logic System in limited configuration
due to "persistent false alerts," notify Technical Operations so that
corrective action can be taken.
d. When an
AMASS false alert is received, limited configuration shall only be used
until Technical Operations verifies that the system is functioning properly
and that the data necessary to analyze the alert has been obtained. Analysis
and resolution of the circumstances surrounding the false alert will be
determined by Technical Operations at a later date.
e. When limited
configuration is applied, it shall be noted on FAA Form 7230-4, Daily Record
of Facility Operation, including the reason for the configuration change.
Ensure that all limited configurations are carried over on applicable logs.
NOTE-
1. For AMASS, the limited configuration disables all alerts
except arrivals to a closed runway and is not considered full-core alert
status.
2. For ASDE-X
the limited configuration disables all alerts except arrivals to and
departures on a closed runway and is not considered full-core alert status.
11-9-6. WATCH
CHECKLIST
The Safety Logic
System status shall be included in the facility watch checklist. At a
minimum, the following items shall be reviewed:
a. Operational
status.
b. Runway
configuration.
c. Presentation
of the Safety Logic System data on all ASDE system displays.
d. When test
button is activated, the aural alert is heard, and the speaker volume is
adequate.
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