What ADS-B Data Can Tell Us About HL7525(KAL631) Accident at the CEBU Airport

This research aims to extract useful information from the HL7525 accident ADS-B data archive. The approach used is Exploratory Data Analysis (EDA), which ensures that the ADS-B data quality standards must be met and visualizes the landing position or touchdown, altitude, and speed data, which is then compared with the flight rules for the landing phase. These criteria are based on three important characteristics that ensure the aircraft does not overrun: touchdown point, touchdown speed, and deceleration after touchdown. Data analysis revealed that the stored ADS-B HL7525 data had good data quality, falling within the ICAO standard (tier-1) for 82% of the total data, meaning that this data was 82% representative of the actual environment. In addition, it was found that the aircraft attempted three landings, with the first and second attempts showing the go-around procedure, and the third attempt (the final attempt) landing successfully but ending in an accident. Based on the analysis results, two of the landing criteria were met even though the slope angle exceeded 30, and the third criterion was not met because the deceleration process after touchdown was not in accordance with the procedure.