The black boxes will provide cockpit conversations and data related to the plane's engine and control settings to investigators and help them in determining the cause of the crash.

The crash could renew scrutiny of Boeing, which suffered a major blow to its reputation after 2018 and 2019 crashes involving its 737 Max planes.

The watchdog requested for training details and supporting documents for the pilots, as well as for the flight dispatcher. The memo did not elaborate on the type of documents requ