Transcript for Pilots heard on audio recording pleading with Boeing
altogether. Now to that report about Boeing revealing new details about a meeting shortly after the first deadly crash. In the audio recordings you can hear the pilots pleading with Boeing to take more action to prevent an accident. Our senior transportation correspondent David Kerley has the details. This comes ahead of a house committee hearing on the planes today. Reporter: Yeah, it's coming up in just a couple of hours. Members of congress want to know what's going on with that 737 which is grounded after those two deadly crashes and how the FAA certified that aircraft. This coming on this morning after this heated conversation, American airlines pilots asking months ago to Boeing officials why didn't they know about this new flight control system. We flat out deserve to know what's on our airplanes. I don't disagree. Reporter: The tapes reveal the frustration bordering on anger after this max crash when the world learned a new system could nose down the aircraft and may have contributed to the crash. This is the first time we've heard part of that heated conversation. We're the last line of defense to being that smoking hole and we need the knowledge. Reporter: The tapes shared with media outlets including "The New York Times" quoting the vice president of Boeing at this November meeting saying, the worst thing that can ever happen is a tragedy like this and the even worse thing would be another one but there was a second crash less than five months later in Ethiopia. The Boeing engineers trying to explain back in November why they didn't announce that new system to pilots. I don't know that understanding this system would have changed the outcome on this. A million miles, you're going to be maybe fly this airplane and maybe once you're going to see this ever so we try not to overload the crews with information that's unnecessary. Reporter: At the time Boeing issued a bulletin to airlines about this new system called mcas. Pilots taped it because they were concerned about the safety of the 737 max 8 and they didn't feel like Boeing was sufficiently answering their questions or giving them as much information as they wanted. Reporter: Boeing told airlines it was working on a software fix for the system. The American pilots pushing for Boeing to issue a second bulletin calling for that software fix but the upgrade was apparently not ready at the time. We want to make sure we're fixing the right thing. Yeah, I get that. And we that's the important thing, to make sure we're fixing the right things, but we don't want to rush and do a crappy job fixing the right things and we also don't want to fix the wrong things. Reporter: Now, Boeing did not comment on this conversation back in November. Only saying that it is working with its customers and regulators to get the 737 max back up in the air and, robin, it is the acting head of the FAA who will be on capitol hill later this morning. I know but, David, to hear that audio, all right. Thanks so much.
This transcript has been automatically generated and may not be 100% accurate.