The NTSB says it likely will not participate in investigating the Tehran crash that killed 176 people. Under U.S. sanctions on Iran and diplomatic tensions, involvement would be difficult — and the NTSB’s usual authority is limited. Boeing, which built the aircraft, is also unlikely to join. Instead, the investigation will be led by Iranian authorities, in coordination with the airline’s country, as already arranged. Given the political and legal constraints, U.S. experts may be excluded from evidence access and black-box analysis.
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