Maybe.
AFAIK this is how the NTSB goes to work:
- Engine team
- Airframe/Flight control team
- MX team
- Human factors/ Crew team
Engine team will include reps from GE
Airframe team will include reps from Boeing
MX team will include reps from Boeing
Human factors/ Crew team will be looking for training records, rest/duty times and interview colleagues, friends and family.
The Union will have several representatives from the pilot group on scene to monitor and assist.
These union reps have received special training.
Multi prong approach is the strategy.
I may have the phraseology wrong but that’s basically what’s going to happen.
Based on the accident site a basic working theory will be formed and any evidence discovered by the various teams will be used to either support or discredit the initial theory.
Up to that point we can only guess.