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b. Testing.
(1) Press and hold the PUSH-TO-TEST knob.
Check for the following indications:
(a) OFF flags not in view.
(b) Pointers indicate between 900 feet and
1,100
(c) Digital displays between 900 feet and
1,100 feet.
(d) LO caution light is off.
(e) HI caution light is on.
(2) Release the PUSH-TO-TEST knob. Check
that all indications return to those specified in step a.(2).
NOTE
The LO caution light may appear to go out.
However, the light will be visible with night
vision goggles. In bright daylight, it may be
necessary to shade the indicator to verify operation
of the dimming control.
(3) Rotate the RAD ALT dimming control from
BRT to DIM. Check that the digital display dims and goes
out. Check that the LO caution light dims but does not go
out completely.
c. Inflight operation.
CAUTION
When operating over dense foliage, the
radar altimeters will indicate the altitude to
the tops of the trees. When operating over
sparse foliage, the altimeters may indicate
the altitude between the ground and about
half the average tree height, depending on
ground speed. When external cargo is carried,
the radar altimeter may occasionally
indicate the distance between the bottom
of the helicopter and the load.
(1) Set the RAD ALT dimming control to desired
digital display light level.
(2) Set HI and LO indexes as desired. If HI or LO
indexes are not desired, set the LO index at 0 feet or the
HI index above 1,500 feet.
2-14-12. RADAR ALTIMETER (AN/APN-209(V)) Altitude
Voice Warning System (AVWS).
The face of the altitude voice warning radar altimeter
(RT-1115F/APN-209) is exactly the same as that of the
visual only AN/APN-209A radar altimeter, with the operation
being the same as outlined in paragraph 2-14-9. The
difference is only internal. A transmitter added internally
sends out an aural warning to the pilot, copilot, and flight
engineer interphone station ICS panels when the helicopter
descends below the low index setting or rises
above the high index setting (in addition to the LO or HI
caution lights).
NOTE
The voice portion of the system works off a 10
second clock. If a transition is made thru either
Preset, back to the original warning condition
within this time frame, the voice warning
will stay at its original volume level.
On initial transition the volume is always set to Full. By
momentarily pressing the PUSH-TO-TEST (PTT) knob
once, the message is decreased to 1/2 volume. Momentarily
pressing the PTT knob a second time disables the
aural warning message. Regardless of the volume level,
when the aircraft transitions back through either Preset
(HI or LO) (from caution light OFF to ON), the volume
level of the aural warning message will return to Full.
TM 1-1520-240-10
2-14-5
2-14-13. Controls and Function, Radar Altimeter(
AN/APN-209(V)) (AVWS).
CONTROLS/
INDICATOR FUNCTION
LO SET knob The LO Set knob applies
power to altimeter system. LO
set index on both pilot’s altimeters
can be set independently.
Both LO set indexes must
be masked to turn the set off.
HI SET knob Sets position of HI set index
when turned. Adjusts the
warning message volume level
and tests altimeter system
when pressed.
LO set index Indicates altitude trip point for
LO caution light.
HI set index Indicates altitude trip point for
HI caution light.
Indicator pointer Indicates absolute altitude
from 0 to 1,500 feet.
Digital indicator Provides direct reading four
digit indication of absolute altitude
from 0 to 1,500 feet.
LO caution light Comes on when helicopter
descends below altitude on
LO set index.
HI caution light Light comes on when helicopter
rises above altitude on HI
set Index.
OFF flag Flag is displayed when power
is removed from set, when indications
are unreliable, or
when altitude exceeds
approximately 1,500 feet.
RAD ALT dimming
controls
On right side of both instrument
panels. Controls light intensity
of digital display and HI
and LO caution light.
2-14-14. Normal Operation - Radar Altimeter(AN/
APN-209(V)) (AVWS).
a. Starting.
NOTE
Connect monitor headset to the aircraft ICS.
(1) Rotate the LO SET knob on the altimeter
until the LO index is at 100 feet. Rotate the HI set knob
until HI index is at 800 feet. Allow 1 minute for warmup.
(2) Check for the following indications:
(a) The pointers indicate between –5 and 5
feet.
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