Otto Instrument Service, Inc., with facilities in Ontario and Sun Valley California, provides maintenance, repair and overhaul services to Original Equipment Manufacturers, Foreign and Domestic Commercial Air Transport, Cargo / Freight, Regional, Corporate and Private Aircraft Operators as well as Military and Defense Aircraft Operators around the world. Otto is FAA / EASA authorized and is ISO9001 and AS9100 certified.

Otto Instrument Service, Inc. also manufacturers Aircraft Components and Test Accessories based on Customer Requirements such as Engine Wire Harness Assemblies and Ground Support Equipment.

Both locations operate as fully licensed and factory authorized Honeywell repair centers with capabilities that encompass Commercial and Military avionics, autopilot, air data, and flight guidance systems.