anne makovek has more and if it is raising red flags. certainly raises concerns. the plane went into a dutch roll. a figure 8 with the tail wagging and the plane trying to right itself as it goes from side to side. happened back on may 25th on a south-west flight from phoenix to oakland. only coming to light now. the ntsb says they are going to recover from the dutch roll, they did. landing safely in oakland. an hour later. we spoke about it with a former pilot who is now an aviation consultant. 737. killed somewhere between 150 and 250 people. depending on who you believe. >> that was back in the 1990s. they said they thought the problem was solved and now the investigation into this incident is underway. federal officials think it might have been caused by a damaged back up power control unit. it all comes as the 737 max remains under heavy scrutiny in the wake of the door plug blowing out of a brand-new alaska airlines 9 that led to a temporary grounding of that model. he says the faa has to be a better watch dog of the industry. that things happen during every