At 12:49 pm, the ground proximity warning system (GPWS) began sounding a series of "whoop whoop pull up" alarms, warning that the plane was dangerously close to terrain.
Ás 12:49 pm o Sistema de Advertencia de Proximidade ao Terreo (GPWS) comezou a soar cunha serie de alarmas "whoop whoop pull up" (whoop whoop levantar), advertindo de que o avión estaba perigosamente preto do chan.