Inside the aircraft 'boneyard' now housing Boeing's grounded Max 8s

She said she has ordered the Transportation Department's inspector general, Calvin Scovel, to investigate the MAX certification, and Scovel in turn noted various concerns with FAA inspectors and procedures.

But the agency now says it hasn't, with an FAA spokesperson saying "we have not received the completed software enhancement for review and certification".

Southwest said the plane's pilots reported a "performance issue" with an engine shortly after taking off for the California airport, where it was flying to be in short-term storage. Just two people were on board.

The plane's No. 2 engine began to overheat after takeoff, after ingesting debris on the runway which caused a buildup of exhaust.

"The Boeing 737 MAX 8 will be moved to our Orlando maintenance facility for a review", Landson said.

On the eve of Wednesday's Senate hearing, a Southwest Airlines Boeing 737 MAX 8 made an emergency landing while being ferried with no passengers from Orlando to California.

Meanwhile, across the country in the nation's capital, the head of the USA air safety agency faced harsh questions from senators over its relationship with and oversight of Boeing.

Elwell also details the steps taken to investigate the plane after the first crash in the Java Sea on October 29.

The plane carried no passengers aside from the flight crew.

"All those involved have had to deal with unimaginable pain", Muilenburg said.

If you thought you'd heard enough about the problems with the 737 MAX, we're not done yet.

19 jurisdictions including Australia and the entire European Union have banned 737 Max 8 flights.

Boeing and FAA test pilots are also allowed to make flights to demonstrate the software fixes being developed for the planes.

A joint investigation by the U.S. National Transportation Safety Board, France's aviation investigative authority BEA and Ethiopia's Transport Ministry is expected to release a preliminary report into the Ethiopian crash this week.

Aviation officials in several countries jumped ahead of the FAA in grounding the Max after an Ethiopian Airlines 737 Max slammed into the ground on March 10.

Pilots have been told that the MCAS system - which forces the nose downwards to avoid a stall, or loss of lift - will only operate one time for each event rather than impose repeated corrections like those believed to have pushed the Lion Air jet into a dive, the two people familiar with the briefings said.

Cruz told Yahoo Finance he also wants to know why more training was not required and why manuals may not have had the necessary information for pilots. Southwest Airlines reportedly has 34 of these jets.

He said the safety agency is expecting to get only this week from Boeing "the service-ready product for evaluation." The system is meant to stabilize the plane, but apparently failed in each case, causing the aircraft's nose to drop repeatedly.

The Transportation Department watchdog has previously raised questions about the FAA's certification of Boeing planes and the seemingly close relationship between some agency managers and Boeing. However, last week Garuda Indonesia became the first airline to publicly cancel its Max orders.

  • Tracy Klein