An off-duty pilot reportedly saved a Lion Air flight after the crew lost control of a Boeing 737 Max 8 aircraft in October, one day before the same aircraft was involved in a deadly crash.

Bloomberg News, citing two sources, reported Tuesday that the off-duty pilot, who was in the cockpit jump seat, explained to the crew how to disable a malfunctioning flight control system. In doing so, the pilot saved the flight, which was from Bali to Jakarta, Indonesia.

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The pilot reportedly told the crew to cut power to a motor causing the aircraft to dive, sources told Bloomberg.

The following day, the deadly crash occurred, killing all 189 people aboard the 737 Max plane. The crash followed a malfunction identical to the one that had occurred on the previous day's flight, investigators told Bloomberg News.

Lion Air declined to provide details of the earlier flight to Bloomberg News.

“All the data and information that we have on the flight and the aircraft have been submitted to the Indonesian NTSC. We can’t provide additional comment at this stage due the ongoing investigation on the accident,” Lion Air spokesman Danang Prihantoro said.

The October crash involving the other Lion Air flight has come under renewed scrutiny after another Boeing 737 Max plane crashed this month in Ethiopia, killing all 157 people onboard.

The United States and several other countries have since temporarily grounded all 737 Max planes.