Specified when a glass refresh includes engine indicating — probes, transducers, and display software are scoped to the engine and airframe.

Specified for turbine-capable and integrated-deck EIS installations where a GEA 71-family LRU is required — typically G1000 NXi, G500/G600 TXi EIS, and OEM/STC packages that call out GEA 71B (or GEA 71C when variable-transformer inputs are required).

Specified when owners want primary engine, fuel, and electrical indications on a GI 275 without treating the instrument as an ADI/HSI. Dual GI 275 EIS installs support twins when the AML/STC allows.