CAUTION
Landing and searchlight have less than one foot ground clearance when extended. Use caution when ground taxiing over rough terrain when landing light and/or searchlight are extended.
The searchlight is mounted on the right bottom of the nose section, and is controlled from either collective pitch stick. The 150 watt light can be moved forward through a 120° arc from the stow position. It can also be turned 360° in either a right or left direction on its axis. The light is operated by a switch labeled SRCH LT ON, OFF, BRT, DIM (Figure 2-11). Directional control of the light is pro-
vided through the four-position searchlight control switch, labeled EXT (extend), RETR (retract), L (left), and R (right). When the SRCH LT switch is placed ON, the lamp will go on, arming the control switch. Placing the control switch to EXT causes the light beam to move forward at a rate of about 12° per second. If the switch is placed to OFF the light will extinguish. To retract the searchlight, place the switch to RETR. Refer to Chapter 5 for extend/retract limitations. An infrared .lter can be installed on the con-trollable searchlight to enhance viewing objects outside the helicopter when wearing the night vision goggles. The dim-ming feature provides a variable light level through a switch on each collective grip marked SRCH LT ON -OFF. Push BRT -DIM to control power to the light and the DIM/ BRT mode selector. When the light is on, the BRT DIM switch may be moved to select the desired light level. When the desired level is reached, the switch is released to the center position. Power to light and control the searchlight is provided from the dc essential bus through circuit breakers, marked LIGHTS, CONTR PWR and SRCH CONTR. The IR .lter may be removed for unaided night .ight.
2.65.2 Landing Light. One 600-watt landing light is mounted on the left side beneath the nose section and is controlled from both collective pitch stick grips (Figure 2-11). The light can be extended 107° from the stowed position. A dual function switch is used to operate the light. The LDG LT PUSH ON-OFF switch controls lighting and EXT, RETR controls light position. When the light is ON (LDG LT ON advisory legend should be on) and the switch is at EXT detent, the light can be positioned at any point between stowed and fully extended, or it will continue to extend until reaching its limit and power is removed. When the switch is held at RETR the light retracts to the stowed position. When the light reaches its stowed position, power is automatically removed from the motor. The LDG LT PUSH ON-OFF switch must be pushed OFF (LDG LT ON advisory legend should go off). Refer to Chapter 5 for extend/retract limitations. During extension, the travel speed is about 12° per second, and during retract, about 30° per second. Power to light and control the landing light is supplied from the No. 1 dc primary bus through circuit breakers, marked LIGHTS, RETR LDG, CONT and PWR.
2.65.3 Anticollision Lights. This light system contains four strobes in two separate units, one beneath the aft fuse-lage and one on top of the aft pylon section. The lights are controlled by two switches on the upper console (Figure 2-6) labeled ANTI COLLISION LIGHTS UPPER, BOTH, LOWER and DAY, OFF, NIGHT. The system consists of a dual power supply and two interchangeable day/night anticollision lights. The dual supply system pro-vides separate outputs for the aft fuselage light and the pylon mounted light. Each anticollision light assembly con-tains two lamps, the upper lamp within a red lens for night operation and the lower within a clear lens for day opera-tion. Proper operation is selected by placing the switch to DAY or NIGHT. The desired strobe(s) is selected by plac-ing the switch to UPPER, LOWER or BOTH.Ifat BOTH, the lower fuselage and the aft pylon lights will alternately .ash. If the selector switch is placed to UPPER or LOWER, only that light will .ash. To discontinue operation of the anticollision light(s), the DAY-NIGHT switch is placed to OFF. Power to operate the anticollision light system is provided from the No. 2 ac primary bus through a circuit breaker, marked LIGHTS, ANTI COLL.
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