The major components of the condenser discharge
lighting system are the elevated and semiflush strobe
light units, the master sequence timer cabinet
(containing the local/remote control unit, the monitor
and control chassis, and the master sequence timer),
and the tower control unit.
Strobe Light System
The strobe lights are installed on each center-line
light bar starting 300 feet from the runway threshold
and extending outward for the length of the system.
The strobe light will be located on the center-line light
bar, midway between the center light and the next light
on either the left or right side. They can be placed in
front of the light bar but not more than 10 feet. No
matter where they are placed, they must be in the same
position on each light bar throughout the entire
In the overrun area, the strobe lights are installed as
flush lights. Starting with the 1,000-foot bar (decision
bar) and going out, an elevated type of strobe light is
used. An elevated approach light bar looks like the one
shown in figure 6-40.
The strobe lights are controlled from the remote
control panel. They can be turned on and off
independently or so triggered that they come on when
the approach light switch is in either the third, fourth,
or fifth brightness position. The brightness of the
strobe lights cannot be controlled.
The strobe lights put out a high beam of light that
peaks at 30 million candlepower. DO NOT LOOK
INTO THE BEAM OF LIGHT WHEN YOU ARE
NEAR ONE OF THE LAMPS OR YOUR EYES
COULD BE DAMAGED. The system we discuss here
is one of several different types manufactured. The
operation is the same no matter who manufactures
them. Your knowledge of one will give you an
understanding of the others.
Strobe lights are either flush mounted or elevated.
The operation of the flush light is exactly the same as
that of the elevated light unit. The main difference
between the units is the way in which the components
are arranged. We will be discussing the condenser
discharge strobe light unit (figure 6-41); the numbered
areas in parenthesis will refer to the numbered items in
Figure 6-40.Elevated approach light bar.