Home' RTCA Documents for Review : DO-230H FRAC Contents 137
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stipulations for all fiber networking, buried power line limitations, grounding requirements, fencing
standards, sliding gates v. swing gates, active v. emergency access use only, typical temperature, humidity,
environmental operating conditions, and even preferred supplier agreements. Understanding these
considerations is particularly important when identifying cost effective approaches for supplying power
and communications to sensors and related equipment at remote areas of the perimeter. Consideration must
also be made for existing and future airport operational systems like FAA radars and navigational aids that
could affect the performance characteristics of some sensors/systems.
Tolerance for Change
Any system design and its chosen technologies should be flexible and adaptable to change over the life
cycle of the system. Changes in the operational environment, in the PIDS implementation, and in the state
of sensing technologies (including obsolescence) are guaranteed to occur over time. It is important to ensure
that the system can accommodate these changes without adverse impact to performance or cost.
Additionally, monitoring of the system performance in the face of change offers an opportunity for
continuous improvement to tune and incrementally improve the overall efficacy of the system and address
new threat conditions.
Maintainability and Change Management
The system design should directly support the requirements of preventive maintenance and routine
maintenance activities, unscheduled repairs and system upgrades to reflect technology changes due to
improvements or obsolescence and operational concepts.
In all cases, software, hardware, networks and procedures should be inventoried and controlled within a
rigorous configuration management system.
Most airport environments are sufficiently dynamic and complex to warrant a PIDS solution that can be
easily adapted. A static solution can quickly develop coverage gaps or too frequent nuisance alarms due to
the changing conditions that are typical of many airports. Potential changes that must be reflected in a given
PIDS design are:
Operational (e.g. location changes from storage to active, 12 -hour operation to 24/7)
Buildings (e.g. change from occupied, temporarily un-occupied, to abandoned)
Construction impacts (e.g. temporary construction, change in AOA line)
Seasonal changes (e.g. snow [snow is piled and obstructions occur], bird migrations), etc.
Daily adaptation (e.g. gates go from closed to open, VIPs, taxiing aircraft change runways and get
backed up and block visibility to perimeters. Fog, snow, heavy rainstorms temporarily flood an
area potentially making some sensors unavailable, greatly limit the usefulness of thermal sensors,
high winds impact some sensors as signs, trees, etc. bang on fence or shake the infrastructure, birds
tend to be most active at sunrise, sunset. Garbage and debris, parked equipment obscures the
perimeter. Accidents disabling perimeter infrastructure, equipment failure. Changes in the declared
threat level can result in dynamic changes to the configuration such as expanded alarm zone
coverages, increased sensitivity for selected sensors, modifications to the SOPs, etc.).
Tenant Activity (e.g. private aviation, cargo operations, Air National Guard, etc.)
Fuel Storage (e.g. docks, pipelines, tank fields)
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