Incident Overview
On 28 March 2016, a Boeing 737-400 was conducting an approach to LERJ airport. During the procedure, the Ground Proximity Warning System (GPWS) issued a "PULL UP TERRAIN" alert. The flight crew, operating in visual meteorological conditions (VMC) with visual contact with the landing runway, adjusted the flight path by increasing altitude approximately 1,000 feet. The approach and subsequent landing continued without further issues.
Investigation Findings
The incident investigation determined that the GPWS activation resulted from an early descent after the Initial Approach Fix (IAF). This occurred because the minimum altitude for that segment of the approach procedure had not been entered into the Flight Management Computer (FMC). The investigation classified the cause as human error, specifically the failure to maintain all parameters of the approach procedure.
Safety Recommendations
No safety recommendations were issued by the investigation body.