Sriwijaya Air Flight 182 Accident (PK-CLC)

On 9 January 2021, Sriwijaya Air Flight 182, a Boeing 737-500 (PK-CLC), crashed after departing Jakarta. The aircraft lost contact after a climb, with FDR data showing thrust asymmetry and a left roll before the signal ended.

Probable cause

The official findings identified several contributing factors, including unresolved friction or binding in the thrust lever mechanical system, which caused thrust asymmetry. The autothrottle system failed to disengage promptly due to an undervalued spoiler angle position input. Additionally, automation complacency and confirmation bias may have reduced active monitoring, while the absence of national standards for Upset Prevention and Recovery Training (UPRT) may have contributed to inadequate pilot training for upset conditions.