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3.21.4 Stopping Procedure. MASTER switch -OFF.
3.22 RADAR ALTIMETER SET AN/APN-209(V).
The radar altimeter set (Figure 3-34) provides instanta-
neous indication of actual terrain clearance height. Altitude, in feet, is displayed on two radar altimeter indicators on the instrument panel in front of the pilot and copilot. The radar altimeter indicators each contain a pointer that indicates altitude on a linear scale from 0 to 200 feet (10 feet per unit) and a second-linear scale from 200 to 1500 feet (100 feet per unit). An On/OFF/LO altitude bug set knob, on the lower left corner of each indicator, combines functions to serve as a low level warning bug set control, and an On/ OFF power switch. The system is turned on by turning the LO control knob, marked SET, of either indicator, clock-wise from OFF. Continued clockwise turning of the control knob will permit either pilot to select any desired low-altitude limit, as indicated by the LO altitude bug. When-ever the altitude pointer exceeds low-altitude set limit, the LO altitude warning light will go on. Pressing the PUSH-TO-TEST HI SET control provides a testing feature of the system at any time and altitude. When the PUSH-TO-TEST control knob is pressed, a reading between 900 feet and 1100 feet on the indicator, and a reading between 900 and 1100 feet on the digital display, and the OFF .ag removed from view, indicates satisfactory system opera-tion. Releasing the PUSH-TO-TEST SET control knob restores the system to normal operation. A low-altitude warning light, on the center left of the indicator,
3-94 Change 4
LO

HI SET
BUG

HI DIAL MASK
LO DIGITAL SYSTEM
AA0528
READOUT OFF FLAG  SA

will light to show the word LO any time the helicopter is at or below the altitude limit selected by the low altitude bug. Each pilot may individually select a low-altitude limit and only his LO light will go on when the low-altitude is reached or exceeded. Loss of system power will be indi-cated by the indicator pointer moving behind the dial mask and the OFF .ag appearing in the center of the instrument. If the system should become unreliable, the .ag will appear and the indicator pointer will go behind the dial mask, to prevent the pilot from obtaining erroneous readings. Flight operations above 1600 feet do not require that the system be turned off. The pointer will go behind the dial mask but the transmitter will be operating. Power to operate the AN/ APN-209 is supplied from the No. 1 dc primary through circuit breakers, marked RDR ALTM.
3.22.1 Antennas. Two identical radar altimeter anten-nas (Figure 3-1) are on the cockpit section under the avi-
onics compartment. One is for the transmitter and the other is for the receiver. The antennas are .ush-mounted in the fuselage on the bottom of the helicopter.
3.22.2 Controls or Indicator Function. Control of the radar altimeter set is provided by the LOW SET OFF knob on the front of the height indicator. The knob, marked HI SET, also controls the PUSH TO TEST (Figure 3-34).
CONTROL/  FUNCTION OR INDICATION 
INDICATOR 
LO SET knob  Power  control  turned 
counterclockwise  to  OFF, 
clockwise to on. 

Figure 3-34. Radar Altimeter Set AN/APN-209(V)

CONTROL/ INDICATOR  FUNCTION OR INDICATION 
L bug  Sets altitude warning light.  trip  point  of  LO 
H bug  Sets altitude warning light.  trip  point  of  HI 
HI SET knob  Pushing knob actuates built-in test system to self-test altimeter. 
Altitude pointer  Provides an analog indication of absolute altitude from zero to 1500 feet. 
Digital readout  Gives a direct-reading four digit indication of absolute altitude from zero to 1500 feet. 
LO warning light  Lights whenever dial pointer goes below L altitude bug setting. 
　
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