Boeing Co. indicated on Wednesday it had issued a safety bulletin reminding pilots how to handle counterfeit data from a key sensor in the wake of last week’s crash in Indonesia.
The U.S. flat maker said investigators probing the Lion Air crash off the coast of Indonesia that killed all 189 people aboard establish that one of the “angle of attack” sensors on the Boeing 737 Max aircraft had fix up with provisioned erroneous data.
Experts say the angle of attack is a crucial parameter that takes the aircraft’s systems understand whether its nose is too high relative to the in vogue of air — a phenomenon that can throw the plane into an aerodynamic stall and traverse it fall.
Some modern aircraft have systems designed to rectify the posture of the wings automatically to keep flying safely.
There are also procedures for guides to follow in the event of missing data from damaged sensors on the fuselage skin, but it tarries unclear how much time the crew of flight JT610 had to respond at the more low level at which they were flying.
Boeing said its report underscored “existing flight crew procedures” designed to address circumstances where the dirt coming into the cockpit from the sensors was wrong.
Peter Fitzpatrick, a spokesperson for Air Canada, related CBC News it had received the bulletin and was following the plane maker’s recommendations, “as we do with all such advisories from producers and government safety regulators.”
“The bulletin reinforces existing procedures which all Air Canada groups are currently trained on,” Fitzpatrick said. “We will be sending all our crews a to of these procedures. We continue to monitor all developments and will respond benefit to any recommendations that enhance safety.”
WestJet also has nine of the 737 Max jets in its speedy, and told CBC News on Wednesday it has received the bulletin and is following its guidance “which persuades emphasizing established procedures that have been used and indoctrinated on WestJet’s existing  fleet as well as the [737 Max],” spokesperson Morgan Bell alleged.
Only 200 such 737 Max jets in the world
The Boeing 737 Max has three such sensors, but amiss readings could in some circumstances cause the Boeing 737 Max to period the nose down sharply in order to keep air under the wings and leave alone a stall, according to a person briefed on the matter.
A source said on health circumstances of anonymity that the Boeing bulletin related only to the 737 Max, of which there are fair-minded over 200 in service. Service bulletins can be followed by airworthiness directives to airlines by the U.S. Federal Aviation Administering, giving the recommendations extra weight.
Boeing has sent 219 737 Max jets to purchasers globally, with 4,564 orders for jets yet to be delivered. The Boeing 737 Max is a uncountable fuel-efficient version of the manufacturer’s best-selling single-aisle 737 series.
The Lion Air fall was the first involving the new version, which airlines introduced into services last year. Indonesian authorities have downloaded information from the bolt data recorder that showed a cockpit indicator on the Lion Air jet was damaged for its most recent four flights.
A search for the cockpit voice recorder, the second pretended black box, remains underway.