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The re-admission of Boeing's 737 Max aircraft by the US aviation authority FAA is to be investigated again by the Department of Transportation.
"We will review the actions of the FAA," announced the office of Inspector General Eric J. Soskin on Tuesday (local time) in Washington.
It is about evaluating the processes and procedures of the supervisory authority.
The 737 Max - Boeing's best-selling aircraft model - was banned from take-off in March 2019 after two crashes with a total of 346 deaths.
After repairs to a control system, which is considered to be the main cause of the accidents, the machine was approved for operation again by the FAA in November 2020.
Due to new problems with the electrics, many of the jets are currently unable to take off again.
The Ministry of Transport had already announced in February that despite reforms following the debacle with Boeing's breakdown plane, there were still weaknesses in the approval process at the FAA.
A lot of work is still needed to restore trust in the supervisory processes - and to ensure the highest level of security during certification, according to an investigation report at the time.
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The report listed a total of 14 criticisms that the FAA should improve. It was about greater independence - so it must be made clearer in the future when Boeing employees carry out FAA tasks themselves. The FAA agreed to all objections and vowed to get well soon. The links between the authority and the group had caused a lot of suspicion after the crashes.