Ah, this article explains it:
Quote:
Can Iran legally refuse to hand over the black box?
In a word, yes.
ICAO’s set of safety initiatives asserts that the investigation into an air crash will be held where it happened, referred to as “the state of occurrence.”
When the plane crashed in Tehran, Iran became the state of occurrence.
In accordance with ICAO rules, Iran is required to produce a preliminary report stating the basic facts within 30 days.
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https://globalnews.ca/news/6382084/i...x-plane-crash/