TM 55-1520-240-23-7
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LIGHTING SYSTEMS
(Continued)
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COCKPIT DOME AND UTILITY LIGHT SYSTEM WITH
17 AND 53
Description
The cockpit dome and utility lighting system provides
lighting for the cockpit. This system includes two cockpit
dome lights, two utility lights, and a WHT/OFF/NVG
three-position positive-locking select switch. This
positive-locking switch prevents inadvertent white light
(WHT) activation during NVG operation. The system
operates from the 28 volt No. 2 dc essential bus.
Operation
When COCKPIT DOME circuit breaker is closed, 28
vdc from No. 2 dc essential bus is applied to the
moving contact of the WHT/OFF/NVG three-position
positive-locking select switch and directly to the utility
lights. When the select switch is at WHT, 28 vdc is
connected to the white lamps in the dome lights. When
the switch is at NVG, 28 vdc is connected to the "blue"
lamps (inside each light, there is an NVG filter over the
lamp). There is also an NVG filter over the lens of each
utility light.
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