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will automatically zeroize anytime the MASTER control
switch or helicopter power is turned off or interrupted.
The codes may be retained by using the HOLD
function. After landing place the MODE 4 CODE selector
switch to HOLD and release before turning the
MASTER control switch OFF or helicopter power off.
Allow approximately 15 seconds for the HOLD function
to operate before turning the MASTER control
switch OFF or helicopter power off. The HOLD function
must be selected with the helicopter on the ground
(determined by the squat switch). Selecting the HOLD
function while the helicopter is airborne has no effect
whatsoever. MODE 4 codes can be zeroized anytime
the MASTER control switch is not in the OFF position
and the helicopter is powered by placing the MODE 4
CODE switch in the ZERO position. Zeroizing is immediate.
The transponder computer KIT-1A/TSEC and
KIT-1C/TSEC operation is classified.
3-70 Change 2
TM 1-1520-238-10
3.18 ALTIMETER AN/APN-209(V).
The radar altimeter system (fig 3-27) provides instantaneous
indication of actual terrain clearance height.
Altitude, in feet, is displayed on a radar altimeter indicator
on the instrument panel in front of the pilot. The
radar altimeter indicator contains a pointer that indicates
altitude on a linear scale from 0 to 200 feet (10
feet per unit) and on 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 the indicator,
combines functions to serve as low level warning bug
set control and on/OFF power switch. The system is
turned on by turning the LO control knob, marked
SET, clockwise from OFF. Continued clockwise turning
of the control knob will permit the pilot to select any desired
low-altitude limit as indicated by the LO altitude
bug. Whenever the altitude pointer exceeds low-altitude
set limit, the LO altitude warning light will go on.
Turning the PUSH-TO-TEST HI SET control on the
lower right corner of the indicator positions the high altitude
bug. Whenever the pointer exceeds the HI altitude
set limit, the high altitude warning light will come
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 HI SET control
knob is pressed, a reading between 900 feet and 1100
feet on the indicator, and digital display will be displayed.
The OFF flag removed from view indicates satisfactory
system operation. Releasing the PUSH-TOTEST
HI SET control knob restores the system to
normal operation. Loss of system power will be indicated
by the indicator pointer moving behind the dial
mask and the OFF flag reappearing in the center of the
instrument. If the system should become unreliable,
the flag will appear and the indicator point will go behind
the dial mask to prevent the pilot from obtaining
erroneous readings. Flight operations above 1500 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 emergency dc bus through the RDR ALT
circuit breaker on the pilot center circuit breaker panel.
3.18.1 Antenna. The radar altimeter antenna (fig
3-1) are flush-mounted in a fairing on the bottom of the
helicopter. The aft antenna is the transmitting antenna
and the forward is the receiving antenna.
3.18.2 Controls, Indicators, and Functions. Control
of the radar altimeter set is provided by the LO SET
OFF knob on the front of the height indicator. The knob
marked HI SET also controls the PUSH TO TEST.
Control and indicator functions of the AN/APN-209 altimeter
set are described in table 3-24.
Figure 3-27. Altimeter AN/APN-209(V)
3-71
TM 1-1520-238-10
Table 3-24. AN/APN-209(V) Altimeter Control and Indicator Functions
Control/Indicator Function
LO SET knob Power control turned counterclockwise to OFF; clockwise to on.
LO SET bug Sets altitude trip point of LO warning light.
HI SET bug Sets altitude trip point of HI warning light.
HI SET knob Pushing knob actuates BIT system to self-test altimeter.
Altitude pointer Provides an analog indication of absolute altitude from zero to 1500 feet.
Digital readout Provides a direct-reading four-digit indication of absolute from zero to 1500 feet.
LO warning light Lights whenever dial pointer goes below L altitude bug setting.
HI warning light Lights whenever dial pointer goes above H altitude bug setting.
OFF flag Moves into view whenever altimeter loses track while power is applied.
3.18.3 Operation. 5. HI warning light - Will be off.
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