LUN 1795.2

Electronic Horizontal Situation Indicator EHSI

The gyroscopic direction indicator or directional gyro gave rise to the horizontal situation indicator (HSI), which later evolved into the EHSI (Enhanced Horizontal Situation Indicator). The EHSI surpasses the HSI by incorporating directional information from two navigation aids and the aircraft’s heading.

Technical parameters

RS 232: 1× Service port

ARINC 429 RX: 4× Input port

GPIO: 4× Digital input or 2× Relay output

AN IN: 1× Analog input

ARINC 407/Russian: 3× Synchro/Resolver

Inputs: 1× Vertical and lateral deviation

RS 232/422 (optional): 2× Input port

ARINC 429 TX (optional): 2× Output port

MIL 1553 (optional): 2× Bus

DIN (optional): 2× Digital input

XYZ/SinCos (optional): HDG, ROLL, PITCH, ADF/RMI/VOR (SinCos/Synchro)

CDI: NAV/Annunciators, ToFrom, Flags

General Parameters

Voltage (nom.): 27,5 V DC

Voltage (operative): 11…30 V DC

Current (nom.): 0,3 A

Power Consumption: 10,25 W

Operating temperature: -55 – 70 °C

Storage temperature: -55 – 85 °C

Humidity: max. 95 %

Connectors: Circular 37 pin

Dimensions: 132 × 123 × 123 mm

Weight: 1300 g ± 10 %

Display Parameters

Display area: 94,5 (H) × 94,5 (V)

Number of dots: 1200 (H) × 1200 (V)

Number of color: 10bit/color (1,07 B)

Luminance: 1200 cd/m2

Viewing angle: >-80~80° (H), -70~80° (V)

Back-light unit: Edge-light, LED, optional NVIS-B

In addition to these features, the EHSI goes beyond its predecessors to display an even greater amount of valuable navigational information.

Its main objective is to maximize the provision of useful navigational data for pilots.

lun 1795 2 block diagram

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