TM 9-2320-361-10 2-4. CHASSIS CONTROLS AND INDICATORS (Contd) Key 9 10 11 12 13 14 15 Item and Function Directional Turn Signal and Flasher Control Lever is moved down to operate left turn signals and up to operate right turn signals. The flasher control activates emergency flasher lights. Steering Wheel is used to control direction of vehicle. Horn Button is pressed to sound vehicle horn. Spring Tension Control Lever increases seat spring tension when lever is turned clockwise. Cowl Ventilator opens to allow air flow into driver’s component. Air Supply Valve provides an auxiliary compressed air connection for inflating tires, cleaning air filters, etc. Transmission Gearshift Law is used to place transmission in 1 through 5 drive positions, reverse, or neutral. 2-5