Installation Manual

THALES COMMUNICATIONS
OIM
AHV1600-SYSTEM
Page 301
July 16/09
OPERATION
1. RADAR ALTIMETER ENERGIZATION
The AHV1600 radar altimeter is not provided with an “ON-OFF” switch. The equipment starts operating as
soon as the + 28 VDC power supply is applied by a circuit breaker or other mean located on the helicopter
front panel.
2. FUNCTIONNAL TEST
When the functional test is requested, the system shall outputs a 100 ft test height and functional test is indi-
cated in the status matrix of word labels 164 and 165.
3. NORMAL OPERATING MODE
When on ground or flying in the system range, the radar altimeter shall output the helicopter height above the
ground with the specified accuracy. Alarms shall be out of view.
The status matrix of ARINC 429 words shall indicate the Normal Operation status.
4. OUT OF RANGE OPERATION
When the helicopter is flying outside the system range (above 5000 ft), the radar altimeter shall enters in the
loss of track mode (search mode).
The status matrix of ARINC 429 words shall indicate the No Computed Data status.
5. FAILURE MODE
When a failure is detected by the radar altimeter monitoring, when the helicopter is either on ground or flying,
it is signalled.
The status matrix of ARINC 429 words shall indicate the Failure Warning status.