the needs of designated locations. In each fixture, a
certain type of lamp must be used to give off the right
kind of light. A runway light fixture, in a series loop
system, requires an isolation transformer (IT). These
transformers must be matched to each lamp according
to amperage and watts. Figure 6-39 provides you with
a pictorial view of the lighting fixtures used in
contingency airfield operation; table 6-3 provides the
Naval Air System Command part number of each
fixture plus the number of fixtures required per given
type of field installation.
Several different types of lights are used. The
exact type used depends on the system. Not only are
there different fixtures for different widths of runways,
but there are different intensities. In most cases, high-
intensity lighting systems are used for high-speed air-
craft. Also, high-intensity lighting systems are required
during low-visibility conditions.
The condenser discharge lights are added to make
the approach system complete. Because the lamps
flash on and off to give a stroboscopic effect, the term
strobe is used for these lights. From here on out, the
term strobe will be used when referring to condenser
The transformer and the master sequence timer
cabinet are located in a small vault or pad near the
center ofthe approach system. The vault or pad should
be secured so neither animals nor unauthorized per-
sonnel can enter..
Table 6-3.Airfield Lighting Equipment Required.