Home' RTCA Documents for Review : DO-230H FRAC Contents 97
©2017 RTCA, Inc.
The typical exit scenario will show pedestrian traffic flow moving progressively, in an authorized direction
toward the landside. Barrier doors will activate (microwave sensor) and open to allow unimpeded
pedestrian flow, while monitoring the door swing zone (infrared sensor) to prevent the door from striking
a person who may be standing in the door travel zone.
Intruder detection is most commonly defined as a person(s) who intentionally or unintentionally attempts
to enter the exit lane from the unauthorized landside area. The potential intrusion is captured by the camera
system, the video stream is simultaneously analyzed and compared to the known, secure footprint. The
algorithms in the analytic software determine this movement to be a violation of the defined “rules” and
initiates a sequence of notification alarms to the potential intruder and to the designated airport security
Alarms are generated in stages, depending on the level of the intrusion zone. The first zone may begin with
voice announcements to the intruder, “wrong way, please turn around and exit the area.” In this situation,
the intruder hears the audible message, turns around and leaves the zone. The intrusion was detected, the
intruder and security personnel were notified and because the intruder recognized the error and turned
around; there were no further alarms and the ELBC system returns to the normal state.
Should the intruder ignore the audible message and continue to progress toward the sterile side, the next
zone will produce a second, more stronger audible message such as siren and may generate a visual alarm
such as a flashing beacon. It is at this alarm stage, all doors will begin to safely close and lock.
Although human intrusion is considered an object for analytic purposes, there should be a differentiation
between a human intruder and a physical object. Many ELBC systems are capable of detecting an object
of some definable size from being thrown through the open doors to the secure side. Thrown objects are
most commonly detected by a series of photoelectric beams called light curtains. As described, the sensors
form a “curtain of light,” which when broken, generates a notification signal and creates an alarm. Upon
receiving the notification signal, the control unit for the airside doors triggers the closing sequence and the
doors begin to safely close in an attempt to prevent the thrown object from entering the sterile area.
The ELBC system shall also be capable of detecting objects that are placed inside the interlock compartment
between the landside and airside doors. A camera may be used to monitor the compartment area, provide
video streams to the microprocessor and evaluated by the analytic software. The same theory applies to
detecting abandoned objects that applies to intruder detection. A known, sterile condition is compared to
the static floor condition to determine any variance in state. Should there be a variance; the system
determines this to be a violation of rules, notifies the airport security personnel by generating an alarm
signal and keeps the airside doors closed and locked until the object is removed. The ELBC system must
remain in a locked and alarm condition until confirmation by security personnel that the object is removed
or the alarm was false. Upon safe confirmation, the ELBC system alarm is cleared and the unit immediately
returned to service.
Interfaces for Authorized Access
Automated ELBC systems shall have the ability to provide Input and Output (I/O) points to allow
surveillance, fire detection and airport security personnel access to alarm signals, operational functions and
video streams from the video analytic feature if available. In addition, interface to local PACS enables the
Links Archive Navigation Previous Page Next Page