The Federal Aviation Administration issued an emergency order grounding all Boeing 737 MAX aircraft on March 13, citing new information that showed a achievable hyperlink amongst the March 10 crash of an Ethiopian Airlines flight and the crash of a Lion Air flight off the coast of Indonesia final October. In an interview with NPR’s David Greene this morning, acting FAA Director Dan Ewell mentioned that “newly refined satellite information” from a flight telemetry method had led the agency to make the move.
Each Ethiopian Airlines Flight 302 (ET302) and Lion Air Flight 610 (JT610) have been lately acquired 737 MAX eight aircraft, and each have been lost with all aboard just minutes right after take-off. According to the emergency order issued by the FAA, “new info from the wreckage regarding the aircraft’s configuration just right after takeoff that, taken with each other with newly refined information from satellite-primarily based tracking of the aircraft’s flight path, indicates some similarities amongst the ET302 JT610 accidents that warrant additional investigation of the possibility of a shared lead to for the two incidents that requires to be far better understood and addressed.”
The supply of the information in query is a mixture of telemetry feeds from the flights’ Automatic Dependent Surveillance(Advertisements) method. Introduced in the US in 2001 and far more extensively worldwide in the wake of the crash of Malaysian Airlines flight 370 in 2014, Europe has necessary most aircraft to carry the UHF-band Advertisements-Broadcast (Advertisements-B) method given that 2017, and the FAA has mandated Advertisements-B for most aircraft by 2020.
Although Advertisements-B information was initially meant to be picked up by other aircraft and ground stations, it is also tracked by satellites. Other, significantly less-granular telemetry information sent in the subscription-primarily based Advertisements-addressed/Contract (Advertisements-A/Advertisements-C) format, the Future Air Navigation Method(FANS), and the Aircraft Communications Addressing and Reporting Method (ACARS) are also picked up by satellite.
The investigation is not total, and a direct hyperlink amongst the crashes is not particular. Witnesses to the ET302 crash mentioned that they saw smoke coming from the aircraft ahead of the crash. But the vertical speed profile of ET302 transmitted by way of the aircraft’s Advertisements-B telemetry showed a comparable pattern of sudden dives to that of JT610. Advertisements-B information recorded for ET302 by FlightRadar24 shows that the aircraft, right after reaching an altitude of eight,025 feet, abruptly dipped, plunging 400 feet ahead of recovering briefly. But the aircraft’s vertical speed remained unstable, and a couple of minutes later it dove into the ground.
The broken flight information recorder from ET302 has been sent to France for additional evaluation. The FAA and National Transportation Security Board (NTSB) are supporting the investigation.