Israel Aerospace Industries has offered its systems for possible integration with Embraer's developmental KC-390 tanker/transport.
IAI will not elaborate on which specific equipment it is proposing, but it is understood that its offer includes cockpit and aircraft self-protection systems.
The development builds on a pact signed by the companies in 2009, under which they pledged to increase co-operation through EAE - a Brazilian company owned jointly by IAI and local corporation Synergy.
The agreement covers unmanned air vehicles, multi-mission radars, inertial navigation systems, maritime platforms and systems and border and coastal defence systems. It also spans upgrade and conversion services for civilian and military aircraft.
IAI is already supplying radar systems for an Embraer-led upgrade to the Brazilian navy's Douglas A-4 strike aircraft. The Israeli company will also overhaul the fighter's engines.
Sources say Embraer is also offering special mission aircraft equipped with electronic intelligence or airborne early warning systems based on the experience of IAI. The company's Elta Systems subsidiary has already developed surveillance derivatives of the Gulfstream G550 business jet.