The Symphony high pressure turbine rotor is fully assembled, as are compressor stages 1/2. Current hold-up is a late supplier building the Stage 3 blisk.
This is why we're vertically integrating—legacy suppliers don't move at Boom speed. Next engine will have Boom-made blisks.
Blake Scholl 🛫 (@bscholl)
Monitoring the turbine situation
— https://nitter.net/bscholl/status/2068780108534460878#m