> Same reason why an aircraft manufacturing company would get involved in a NTSB investigation when there is an airplane crash
Key difference here is that the NTSB is third party with force of law behind it.
The victims in the crash – airlines and passengers – aren't rushing to the aircraft manufacturer to come fix things.
Quite the opposite: the NTSB and FAA have the authority to quarantine a crash site and ensure nobody tampers with the evidence.
Possible tampering with black boxes was an issue in the investigation of Air France Flight 296Q.
Key difference here is that the NTSB is third party with force of law behind it. The victims in the crash – airlines and passengers – aren't rushing to the aircraft manufacturer to come fix things. Quite the opposite: the NTSB and FAA have the authority to quarantine a crash site and ensure nobody tampers with the evidence. Possible tampering with black boxes was an issue in the investigation of Air France Flight 296Q.