Bombardier is to co-operate with Chinese airframer Comac on four programmes centred on exploiting commonality between its CSeries twinjet and the C919.
The initial programmes include exploring common aspects of crew interfaces in the cockpits of the two aircraft.
Bombardier says the other projects will focus on the electrical systems of the jets, the development of aluminium-lithium materials standards, and customer services.
The definitive agreement will deepen the collaboration between the two airframers established a year ago.
All four projects will be completed over the next year, says Bombardier, adding that the effort "demonstrates the complementary nature" of the CSeries and C919 programmes.
"Both parties will continue exploring other possibilities for co-operation with regards to aircraft program commonalities, joint procurement, synergies in development and customer services, as well as collaboration on Bombardier and Comac programs," it says.
The agreement aims to "maximise both parties' cost savings", states Bombardier chief Pierre Beaudoin.
Comac chairman Jin Zhuanglong adds that the tie-up will enhance the competitiveness of each aircraft.