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.

CONDENSER DISCHARGE LIGHTING SYSTEM

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 discharge lights.

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 personnel can enter.

Table 6-3. - Airfield Lighting Equipment Required.