JAKARTA, Indonesia (AP) — A preliminary report into last month’s Lion Air plane crash off the resort island of Bali urges the budget carrier to immediately address safety concerns by providing more training for pilots during critical landing times.

The National Transportation Safety Committee’s investigation did not outline what caused the accident, but said the brand new Boeing 737-800 aircraft was airworthy. It issued three safety recommendations for Lion Air to ensure its pilots are properly trained and follow regulations for handing over the controls at critical altitudes and times, and how to respond when visibility is limited at low altitudes.