The Lion Air Boeing 737 MAX jet that crashed in Indonesia on Monday morning flew erratically during a flight the previous evening when it experienced a "technical problem", according to data from flight tracking website FlightRadar24.
After taking off from Denpasar on the holiday island of Bali on Sunday evening, the jet reported unusual variations in altitude and airspeed in the first several minutes of flight - including an 875-foot drop over 27 seconds when it would normally be ascending - before stabilising and flying on to Jakarta.
However, the pilots kept the plane at a maximum altitude of 28,000 feet compared with 36,000 feet on the same route earlier in the week.
Lion Air CEO Edward Sirait told reporters on Monday a technical problem had occurred on the Denpasar-Jakarta flight but it had been resolved "according to procedure".
Two of that flight's passengers posted on Instagram, reporting that they had been concerned about problems with the air conditioning system and cabin lighting before the plane departed nearly three hours late.
"I was angry because as a passenger who had paid her ticket, we have every right to question the aircraft's safety," said one of them, TV presenter Conchita Caroline. She added there was a "weird" engine noise upon take-off that continued during flight.
It was not clear if the cabin problems were in any way related to the technical trouble mentioned by the airline's CEO.
The Denpasar-Jakarta flight landed at 10:55 p.m. local time on Sunday, giving engineers six-and-a-half hours at most for checks before it was dispatched for the fatal Jakarta-Pangkal Pinang flight at 6:20 a.m. on Monday.
The plane plunged into the sea minutes after taking off from Jakarta and all 189 people on board are believed dead.
FlightRadar24 also reported unusual air speeds and altitudes in the few minutes that Flight JT610 was in the air on Monday.
Photos of alleged technical and maintenance logs following the Sunday flight have been circulating online, but to date they have not been verified as accurate by the airline or investigators.
Sirait declined to detail the maintenance procedures taken, and on Tuesday he told Reuters the airline had provided the relevant aircraft flight and maintenance logs to Indonesia's National Transporation Safety Committee.
NTSC Chairman Soerjanto Tjahjono said there was a similarity between the maintenance log circulating online and the one received from Lion Air but he had not checked the exact details.
Safety experts say the crash investigation is at a very preliminary stage and it is too early to speculate about the cause.
But pilot and engineering sources told Reuters the FlightRadar24 data for both flights, while not conclusive, could be a potential indicator of something wrong with the pitot static systems. Those are pressure-sensitive instruments that feed airspeed and altitude information to an avionics computer.
"Certainly the big changes in climb/descent very early on in the flight is what makes me think unreliable speed," said a pilot at another airline, who declined to be named because he was not authorised to speak to media.
NO NOISE
The data from FlightRadar24 shows the first sign that something was amiss on Monday's fated flight came about two minutes after take-off when the plane had reached 2,000 feet.
At that point, it descended more than 500 feet and veered to the left before climbing again to 5,000 feet, where it stayed during most of the rest of the flight.
It began gaining speed in the final moments and reached 345 knots (397 mph) before data was lost when it was at 3,650 feet.
"They were going way faster than you would normally expect," said a second pilot at another airline.
Two fishermen who saw the crash from their boat out at sea told Reuters that the plane swayed slightly but made no noise as it fell, almost horizontal with its nose slightly down. There was an explosive sound as it plunged nose-first into the sea, and then there was a column of smoke.
The weather was clear at the time of the crash at 6:33 a.m. on Monday, according to the head of Indonesia's transport safety committee, who said the pilots had requested a turnback to Jakarta.
A safe visual landing should have been possible even with faulty indicators and a lack of autopilot systems, the pilot sources said.
In July, a Malaysia Airlines flight took off from Brisbane, Australia without removing covers on the pitot tubes.
The pilots landed the Airbus SE A330 safely after obtaining groundspeed information from air traffic control and using the jet's radar altimeter, according to a preliminary report from the Australian Transport Safety Bureau. There were no reported injuries.
In 2009, Air France flight 447 crashed into the Atlantic Ocean after icing that blocked the pitot tubes caused unreliable airspeed data and the confused pilots entered a high-altitude stall and ignored cockpit alarms, according to a report from France's BEA. All 228 people on board died.
Reuters
Tue Oct 30 2018
Safety experts say the crash investigation is at a very preliminary stage and it is too early to speculate about the cause. - Pic REUTERS/Stringer
Pelajar PhD USIM ambil ujian di sebalik runtuhan di Gaza
Pelajar PhD USIM warga Palestin nekad menjalani Ujian Kelayakan yang dijalankan secara dalam talian pada Jumaat walaupun berdepan risiko dibom tentera Zionis pada bila-bila masa.
UMNO dan BN dokong calon PH demi Kerajaan Perpaduan - Ahmad Zahid
Presiden UMNOsedar taktik pihak tertentu yang cuba melaga-lagakan parti pimpinannya dengan parti komponen Pakatan Harapan itu.
PRK Kuala Kubu Baharu saksikan pertandingan empat penjuru
Keempat-empat calon itu ialah Khairul Azhari Saut (PN), Pang Sock Tao (PH), Nyau Ke Xin (Bebas) dan Hafizah Zainudin (Parti Rakyat Malaysia).
3 maut, 5 parah nahas dua pacuan empat roda
Tiga maut, lima parah dalam kemalangan membabitkan dua kenderaan pacuan empat roda di Jalan Kuala Krai-Gua Musang kira-kira jam 12.30 pagi tadi.
Penunjuk perasaan pro-Palestin di Paris kepung universiti
Penunjuk perasaan pro-Palestin mengepung bangunan dan kawasan hadpaan Universiti Sciences Po yang berprestij di Paris pada Jumaat.
Piala Thomas: Zii Jia pamer magis tarik perhatian ramai di Chengdu
Zii Jia merekodkan kemenangan ke atas Lee Cheuk Yiu dalam aksi yang mengambil masa 45 minit menghadirkan saat-saat terbaik dalam saingan pembukaan ini.
Youth All Girls raih gangsa di Amerika Syarikat
Pasukan sorak Malaysia Youth All Girls raih gangsa di The 2024 International Cheer Union World Cheerleading Championships (ICU JWCC) di Florida, Amerika Syarikat pada Khamis.
Perkembangan proses penamaan calon PRK Kuala Kubu Baharu
Pilihan Raya Kecil (PRK) Dewan Undangan Negeri (DUN) Kuala Kubu Baharu (KKB) membuka tirai hari ini dengan bermulanya proses penamaan calon pagi tadi di Dewan Serbaguna Dan Kompleks Sukan Daerah Hulu Selangor.
Firdaus Azil ada perincian untuk dikongsikan jam ini.
Firdaus Azil ada perincian untuk dikongsikan jam ini.
Malaysia-China bincang perkukuhkan kerjasama sektor pendidikan
Malaysia dan China membincangkan inisiatif strategik bagi memperluas serta memperkukuh jalinan kerjasama sektor pendidikan tinggi antara Kuala Lumpur-Beijing sempena sambutan ulang tahun ke-50 hubungan diplomatik Malaysia-China.
Perdana Menteri ke Riyadh sempena mesyuarat khas Forum Ekonomi Sedunia
Perdana Menteri Datuk Seri Anwar Ibrahim akan mengadakan lawatan kerja ke Riyadh, Arab Saudi sempena mesyuarat khas forum sedunia World Economic Forum (WEF) bermula 27 hingga 29 April ini.
Wanita dipenjara 26 tahun bunuh ibu kandung
Heather Mack juga dituduh bersubahat menyorok mayat ibunya itu di dalam beg pakaian.
Kemarau, kebakaran hutan: Bali isytihar darurat selama dua minggu
Bali mengisytiharkan darurat selama dua minggu susulan kebakaran hutan tanah gambut dan kemarau melanda pulau itu.
Bali bakal kenakan bayaran masuk AS$10 kepada pelancong asing
Pelawat asing yang mengunjungi Bali bakal dikenakan yuran kemasukan sebanyak AS$10 seorang mulai tahun depan, menurut pejabat pelancongan pulau itu, lapor Agensi Berita Jerman (dpa) ).
Bali keluar panduan etika untuk pelancong
Pekeliling itu menyenaraikan 16 peraturan yang bertujuan untuk memelihara budaya, alam sekitar dan keselamatan Bali.
'Content' dipertikai lagi, Nas Daily buat hal dengan Indonesia pula
Nas Daily menyiarkan video di Instagram yang memaparkan Bali dan penduduk berbangsa asing atau berkulit putih.
Bali dilanda gempa bumi dengan magnitud 5.2
Gempa bumi sederhana dasar laut berukuran 5.2 magnitud melanda berhampiran Bali pada Selasa.
Sidang Kemuncak G20 Bali berakhir dengan komitmen tangani cabaran ekonomi
Sidang kemuncak G20 yang berlangsung di Bali, Indonesia melabuhkan tirainya pada Rabu.
G20 berperanan utama bentuk dasar kesihatan global - Presiden Turkiye
Kumpulan 20 (G20) "berperanan penting" dalam membentuk dasar kesihatan global, kata Presiden Turkiye Recep Tayyip Erdogan pada Selasa.
Menteri Luar Rusia dihantar ke hospital sebaik tiba di Bali
Menteri Luar Rusia, Sergey Lavrov dilaporkan dibawa ke hospital sejurus tiba di Bali, Indonesia pada Ahad malam.
Berita antarabangsa pilihan sepanjang hari ini
Antara pelbagai berita luar negara yang disiarkan di Astro AWANI, berikut adalah antara yang paling menjadi tumpuan sepanjang hari ini.