EHSIS

Acronym	Definition
EHSIS	Environment Health and Safety Information System

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Most of these EHSIs display your current ground track.

These electronic HSIs (EHSI) like the Sandel SN3308 and the Bendix/King KI825 were common retrofits for mechanical HSIs.

Being just a display, an EHSI relies on a remote heading gyro and magnetic slaving system--typically the same ones that fed the mechanical HSI.

In some cases, the EHSI display will X-out the heading data when the heading feed becomes invalid, but the typical installation did not provide a backup.

These include a PFD showing all the basic flight instruments including the EHSI (with enhancements) and optional (Aspen) or included (Garmin) multi-function displays for ancillary data and moving maps.

For instance, the EHSI within the Aspen PFD relies on a remote sensor module (RSM) for heading resolution.

HSI tech: slaved or non-slaved, electronic or mechanical, a thorough understanding of your HSI system is critical for proper use and early recognition of failure

Before you give up on glass, consider going halfway there with a standalone Electronic HSI (EHSI).

A remote AHARS is connected to a panel-mounted switch that toggles between EHSI and attitude while retaining the heading display.

When analog HSIs die: repair may be best: retrofit glass is a tempting solution, but some conventional systems are worth maintaining if bottom-line cost matters more than top-drawer capability