Step 5. Prepare The Aircraft Engine Harness; Step 6. Make Electrical Interface Connections - Lycoming IO-390-D Series Installation And Operation Manual

IO-390-D Series Engine Installation and Operation Manual

Step 5. Prepare the Aircraft Engine Harness

Lycoming Engines can supply a wiring diagram to the aircraft manufacturer which is used to prepare
the aircraft engine harness.

Step 6. Make Electrical Interface Connections

Make electrical interface connections.
Grounding Requirements
Install grounding jumpers from the engine case to the engine mounting frame. (The engine mount
must also be grounded to the airframe).
Dual EIS Installations
Refer to the airframe manufacturers specifications to ensure the second EIS is connected to a backup
power source independent from the aircraft's electrical system.
Requirements for Engine Installation © 2020 Avco Corporation. All Rights Reserved
Page 16 March 2020