Now Boeing is warning pilots and airlines, including Air Canada and WestJet, that they could experience similar issues with their Boeing 737 Max planes, the same model as the Lion Air plane that crashed.
Lion Air flight JT610 crashed into the sea off Indonesia's island of Java on October 29, minutes after taking off from Jakarta, killing all the 189 on board.
The sensors monitor the so-called angle of attack of an aircraft, which is the aerodynamic calculation of the angle the wings in relation to the airflow.
The latest directive follows advisories issued by USA watchdog Federal Aviation Administration (FAA) and Boeing regarding the B 737 MAX planes after the crash of a Lion Air aircraft in Indonesia last month.
American said it was issuing similar communications to its pilots to emphasize the existing protocols. The "angle of attack" is the angle of the airplane or its wings compared with oncoming air or wind.
Safety investigators said the plane may have hit speeds of 600 miles per hour before hitting the water.
Lion Air said at its website on Tuesday that the remains of 27 of the 189 missing have been positively identified.
"A "ping" has been detected from the second black box but the signal was very weak, possibly because it was encased in mud", said Nurcahyo Utomo, an air accident official at the transportation safety committee (KNKT).
The plane was said to be leaving the terminal and taxiing around 6.30 pm on Wednesday, November 7, readying for takeoff to Jakarta, when it hit the lamp post, reported the Australian.
Officials have now said that the incident will be thoroughly investigated. "The big picture is the system keeps getting safer and safer, and it's still the safest form of transportation ever designed by humans", he said. Pilots are supposed to memorize a procedure to disengage the angle-of-attack inputs to the plane's computer system.
"I would definitely be looking at the man-machine interface and how pilots respond", said Cox, a former airline pilot who flew earlier versions of the 737 and specialized at the NTSB in cockpit actions.
"There are some things that we ask for explanation and some that we ask to be removed, and there has been an agreement between NTSC and Boeing to release a new procedure to all Boeing 737 MAX users in the world". "The tariffs are pushing Boeing to start local production", Bai said. The aircraft system that handles the nose up and down movement (called stabilizer trim system) will put the nose down in response to the erroneous AOA sensor. One of the pilots had trimmed the plane to push the nose down while trying to climb after aborting a landing, the report said.