S. S. White Technologies (Hall 6 Stand C9) is offering flexible rotary shafts that deliver synchronized power to the Nexcelle O-Duct thrust reverser actuation systems (TRAS) for the CFM International (Chalet 121) LEAP-1C engines on the Comac C919 jetliner.

The Nexcelle TRAS replaces the usual two-piece “D” doors with a one-piece composite O-Duct and is deployed with kinematics that transition the O-Duct aft to the reverse thrust position. The electrical thrust reverser actuation system (ETRAS), which was first introduced to commercial aviation on the Airbus A380 jet engine nacelles, is also incorporated.

According to S. S. White Technologies, the newly redesigned O-Duct reduces weight while eliminating the bifurcation in the flow-path. The design also eradicates the need for drag links in the secondary flow-path because the thrust reverser’s kinematics allow for the reverse-thrust position to deploy blocker doors into the secondary flow.

S. S. White Technologies offers a set of three flexible rotary shafts per nacelle that transfer electrically activated power to synchronize the O-Duct actuators that deploy the thrust reverser units on each engine upon landing. To achieve this, the shafts are designed using a software program called Perflextion that was created by the company.