EDIATec ECW100 Betriebshandbuch - Seite 6
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5. Operating Modes
ECW100 operates in two modes, "Nearest" and "Collision". The change from one mode to
the other is effected by a two-second push on the button "Mode" followed by a brief visu-
al confirmation from the unit. After the change has been signaled, the current mode
selected is not displayed. When switched on, the unit is in "Nearest" mode.
The warnings given are identical in both modes, and generally relate to an immediate
threat to which the pilot should make an immediate and appropriate reaction. The as-
sumption has been made that following a warning it will take up to 12.5 seconds from
the time that the other aircraft is seen, until a change in flight path has removed the
1)
threat
.
When operating in the "Nearest" mode, the unit also reports the presence of other air-
craft operating in the vicinity, even though calculations indicate that they do not repre-
sent a threat. The information displayed is limited to a radius of two kilometers and a
vertical separation of 500 m. Only one single aircraft is indicated. The optical signal is
static (no flashing); the threat intensity is not indicated and there is no sound warning.
As soon as ECW100 detects the risk of a collision it automatically switches to "Collision"
mode, followed by automatic reversion to "Nearest". The choice of mode is presented,
such that immediately after pressing the key, the display presents a diverging pattern.
When operating in the "Warning" mode a red LED lights up only if the calculation predicts
a threat. Warnings are always shown by flashing LEDs, the threat level being shown by
the number of LEDs illuminated, by the frequency of flashes, and the simultaneous sound
signal (beep). Selection of this mode is indicated by an upwards converging pattern im-
mediately after pressing the selector key.
In both modes the pilot can suppress the display and the acoustic warning: After a dou-
ble push "Mode" ECW100 will suppress all visual and acoustic signals relating to
traffic, obstacles or other threats. The act of selecting suppression is followed by a de-
scending tone. A further double-push reinstates the "Collision" mode at once and is fol-
lowed by a rising tone. While warnings are suppressed, ECW100 nevertheless continues
to transmit signals for reception by other aircraft.
1) These times were published in 1983 "FAA Advisory Circular 90-48-C" and were based on military data. They relate
to fast jet pilots with no on-board warning systems for other traffic and hazards. The assumption was made that
only one aircraft takes avoiding action. Of the 12.5 seconds, five seconds were to recognize the threat of collision
and four seconds were required to decide upon avoiding action. No information is available as to whether these
times are applicable to light aircraft, sailplanes or helicopters, when using a warning system.
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