AircraftDirectives
MembershipSign inCreate free account
Menu

Printed from https://aircraftdirectives.com/engines/lycoming-io390-a1a6/breakdown · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

← All engines

Lycoming

IO-390-A1A6

Four angle-valve cylinders, lower induction, a forward injector and top fuel manifold in a fitted bare-engine exterior.

Rendered exterior of the Lycoming IO-390-A1A6 engine

A saved render of this model. Load 3D to rotate and inspect it.

Drag to rotate; scroll or pinch to zoom. With the model focused, use arrow keys to rotate and + or − to zoom.

Explore an assembly

Select an assembly or a component to inspect its model evidence.

Model accuracy & scope

Reviewed exterior models with fitted geometry. Installed part numbers and component-level manual matching remain unverified unless explicitly identified.

  • Reviewed first exterior; dimensions, routes and materials include fitted approximations. Not exact installed OEM geometry.
  • Parts groups are a browsing aid, not an OEM exploded assembly or an installed parts catalogue.
  • Internal mechanisms, functional flow and maintenance fit are not established.
  • Fitted receiving-end contacts and endpoint angle differences remain.
  • Upper ignition arches, materials and fine hardware remain refinement work.

Use the applicable manufacturer manual and parts catalogue for maintenance and exact installation details.

View engine family ADs & service bulletins

Manufacturer references

These references inform the model as a whole. A component is linked to a specific page or figure only when that match has been verified.

  1. Lycoming IO-390-A Parts Catalog, Rev 1

    Document host: www.lycoming.com

    June 2025

    Reference pages: Figs 13–17, 20, 24A–27

    Actual A1A6 columns support the component roles; catalogue alternatives are not installed identities.