TM 1-1520-238-T-6
9–92
Change 4
9–7.
SYSTEM DESCRIPTION (cont)
9–7
(7) Anti-Collision Lights.
The anti-collision (fig. 9–84) lights provide a visual anti-collision warning (red
or white). LT ANTI COL circuit breaker (CB40), on the pilot’s center circuit breaker panel, supplies 115 VAC to the
pilot EXT LT/INTR LT panel and anti-collision light power supply. LT NAV circuit breaker (CB73), on the pilot’s
center circuit breaker panel, supplies 28 VDC to the pilot EXT LT/INTR LT panel and anti-collision light power
supply. Setting the ANTI COL switch from OFF to WHT or RED supplies 400 VDC anode voltage and 200 VDC
red or white trigger voltage to the anti-collision strobe lights.
PILOT EXT LT / INTR
LT PANEL
PILOT CENTER CIRCUIT
BREAKER PANEL
115 VAC
LT ANTI COL
CB40
M69-361
RIGHT
ANTI - COLLISION
LIGHT
28 VDC
LT NAV
CB73
400 VDC ANODE
200 VDC R TRIG
200 VDC W TRIG
CATHODE
LEFT
ANTI - COLLISION
LIGHT
400 VDC ANODE
200 VDC R TRIG
200 VDC W TRIG
CATHODE
Figure 9–84.
Anti-Collision Lights Block Diagram
(8) Maintenance Lights.
The maintenance lights (fig. 9–85) are used to facilitate inspection and
maintenance at all points on the helicopter. A battery voltage of 24 VDC is routed through the MAINT LT circuit
breaker (CB8) in the aft avionics bay to the forward and aft maintenance light receptacles. Operation of the
maintenance light is controlled by an OFF/BRT rheostat switch, which is an integral part of the light.
AFT AVIONIC BAY
24 VDC
MAINT LT
CB8
M69-363
BATTERY
FORWARD
MAINTENANCE LIGHT
24 VDC
AFT
MAINTENANCE LIGHT
Figure 9–85.
Maintenance Lights Block Diagram
(9) Landing/Search Light.
The landing/search light (fig. 9–86) provides omnidirectional landing and
search visibility during low-visibility conditions. LT SRCH/LDG circuit breaker (CB22), on the pilot’s center circuit
breaker panel, supplies 28 VDC through the search/landing light relay to the landing/search light. LT SRCH/LDG
CONTR circuit breaker (CB80), on the pilot’s center circuit breaker panel, supplies 28 VDC through the pilot
matrix module for landing/searchlight control. Setting the SRCH LT switch on the collective sticks from OFF to ON
supplies 28 VDC to turn on the landing/search light. Directional control of the landing/search light is through the
use of the RET/L/R/EXT search light switch.
