Boeing Co plans to cut its monthly 737 production by almost 20 percent as it works to manage the grounding of its MAX aircraft in the wake of two deadly crashes, Chief Executive Officer Dennis Muilenburg said on Friday.
The "black box" flight recorder data shows that after MCAS swiveled the plane's horizontal tail to push the nose sharply down three times in succession, the pilots hit the cut-off switches stopping the automatic action and tried to adjust the tail manually, according to the report by the Accident Investigation Bureau of Ethiopia's Transport Ministry.
Boeing CEO Kevin McAllister responded to the report on Thursday, saying that the company would "take any and all additional steps necessary to enhance the safety of our aircraft".
Meanwhile, Spirit Aerosystems announced late Friday that it will maintain its 737 deliveries to Boeing at 52 per month.
He added: "As pilots have told us, erroneous activation of the MCAS function can add to what is already a high workload environment".
At near-maximum thrust, the plane became more hard to fly, multiplying the problems created by the flaw in the 737 Max's software, according to pilots who reviewed a preliminary report issued Thursday by Ethiopia's Aircraft Accident Investigation Bureau.
A preliminary report released Thursday by the Ethiopian government said the Ethiopian Airlines jet suffered from faulty readings by a key sensor, and pilots followed Boeing's recommended procedures when the plane started to nosedive but could not avoid crashing.
"Boeing is now working on a change to the system's software". "These tragedies continue to weigh heavily on our hearts and minds, and we extend our sympathies to the loved ones of the passengers and crew on board Lion Air Flight 610 and Ethiopian Airlines Flight 302", said the CEO.More news: House panel authorizes subpoena to get unredacted Mueller report
MCAS, which was introduced in all Boeing 737 Max jets, pushes a plane's nose downward if data indicates that the aircraft could stall because it is angled upward too steeply. The MCAS activated at least four separate times, and each time the pilots fought unsuccessfully to regain control of the plane.
Muilenburg said Boeing has almost completed work on a software update that would "prevent an MCAS-related accident from ever happening again".
The United States and countries around the world grounded their Boeing 737 Max aircraft after two fatal crashes in a span of five months.
In creating the Max jet, Boeing added bigger engines to the 737, which gave the airplane the fuel efficiency it needed to compete its rival, Airbus.
Boeing is working on a software upgrade for the maneuvering system MCAS, as well as training courses for 737 MAX pilots.
And he once again applauded the safety record of the Boeing 737 even as he apologized for lives lost in the two crashes.
"Shortly after liftoff, the value of the left angle of attack sensor deviated from the right one and reached 74.5 degrees while the right angle of attack sensor value was 15.3 degrees", the report said.