Pilot radioed alert on crashed Lion Air jet's previous flight

A radio alert was made by the pilot of a Lion Air flight from Indonesia's Bali island on Sunday minutes after take-off due to technical problems, but they were overcome and he pushed on to Jakarta. The same jet crashed on another flight hours later, killing all 189 people on board.

"After the alert, the pilot updated the control tower to say that the plane was flying normally and he would not return to the airport as requested," Herson, chief of the airport authority for the Bali-Nusa Tenggara area, told agency.

“The captain himself was confident enough to fly to Jakarta from Denpasar,” said Herson, who goes by one name, speaking by phone from Bali and referring to the resort island’s airport.

The pilot of another plane that was approaching Bali just after the Lion Air jet had taken off said he was ordered to circle above the airport and listened in to a radio conversation between the Lion Air pilot and air traffic controllers.

“The Lion plane requested to return back to Bali five minutes after take-off, but then the pilot said the problem had been resolved and he was going to go ahead to Jakarta.”

Pilots use ‘Pan-Pan’ calls to flag urgent situations. They are a step down from ‘Mayday’, which signals severe distress.

The Denpasar-Jakarta flight landed at the Indonesian capital’s airport at 10:55 p.m. local time on Sunday.

The same Boeing 737 MAX jet took off at 6:20 a.m. the next morning, bound for Bangka island, off Sumatra, and plunged into the sea 13 minutes later. Just before the crash, the pilot had made a request to return to base.

A Lion Air spokesman declined to comment when asked about the alert on the earlier flight, citing the ongoing crash investigation.

The budget airline’s CEO, Edward Sirait, said earlier this week that a technical problem had occurred on the Denpasar-Jakarta flight but it had been resolved “according to procedure”.

Amid media speculation over the airworthiness of the aircraft, the transport minister suspended Lion Air’s technical director and three other officers on Wednesday to facilitate the crash investigation.

The suspended technicians “issued the recommendations for that (final) flight”, the ministry said in a press release. It did not say how many technicians had been suspended.

The country’s second-deadliest air disaster since 1997 has renewed concern about Indonesia’s patchy aviation safety record.

It will also put a spotlight on Boeing’s 737 MAX, which was introduced into commercial service last year and until Monday had an accident-free record. The narrowbody MAX is an update of Boeing’s 737 series, the world’s most produced family of commercial aircraft and one widely considered to have a strong safety record.