The FAA says that a new potential risk has been discovered during simulation tests of the Boeing 737 MAX.
The risk was found during simulation testing of the planes, which had been grounded after two deadly crashes over the period of five months. Boeing must now address the concern before they will be allowed to resume testing.
CNN reports that the risk is the result of a failure of a microprocessor on board the Max could point the plane in a downward position. They are not expected to run another certification test flight until at least July 8th as a result.