Installation Manual

THALES COMMUNICATIONS
OIM
AHV1600-SYSTEM
Page 205
July 16/09
C. CONNECTION
The electrical connection for operational use of each antenna is made by means of a single coaxial
connector.
Type of connector mounted on antenna: 50 ohm female coaxial type TNC connector conforming to
specification MIL-C-39012.
3. VERIFICATION
When the AHV1600 Transceiver is installed, a verification of the operation must be done using the PBIT. This
verification must be done in operational conditions.
A. GROUND TESTS
- Prior to install the transceiver, check all interfering for continuity and isolation,
- Install and connect the transceiver,
- Energise the equipment and check that the ARINC output message contains an altitude close to
0ft. Antenna to ground distance may differ in parked situation from the touch down, so this test
altitude may vary slightly around 0 ft,
- Proceed to Functional Test, the ARINC output message shall contain an altitude of 0 ft exactly,
- Check that the coupling to other systems is correct.
B. IN FLIGHT TESTS
- Sensitivity versus altitude: check that the “loss track” altitude of the radio altimeter is greater
than 5000 ft (No Computed Data indication on ARINC output message),
- Sensitivity versus attitude: Check that the track is not loss for ROLL and PITCH angles as de-
fined by the half power antennae beamwidth.
- Immunity from track to landing gear down and the helicopter structure: when flying at an altitude
higher than 1000 ft, impose the Functional Test mode. At release of the Functional Test, check
that the track mode is recovered and the transceiver outputs a correct altitude different of 0 ft.
- 0 ft accuracy: at touch down landing, check that the radio altimeter indicates 0 ft.
4. FUNCTIONAL CONNECTIONS WITH RELATED EQUIPMENT
A. INTERFACES CONNECTIONS
The following table displays the connector labels, the function, and the connector reference for all
connectors used for the AHV1600 transceiver.