Analysis of low-level wind shear’s (LLWS) trigger factors at Soekarno-Hatta International airport utilizing doppler weather radar Available to Purchase

Aircraft is the preferable transportation during the pandemic. However, one of the ongoing safety issues is low-level wind shear (LLWS). LLWS is a wind shear that occurs at a low level (surfaces up to 1600 feet). LLWS, or low-level wind shear, results in a sudden decrease in the aircraft’s altitude, velocity, and lift, which can cause a loss of control, particularly during take-off and landing. The KNKT investigation found LLWS to cause significantly increasing aircraft accidents in Indonesia. The difficulty of predicting LLWS makes understanding the triggering factors become vital in issuing early warnings. On September 14, 2016, from 12.21 to 12.37 (UTC), a pilot reported LLWS occurred in Soekarno-Hatta International airport. The trigger factors of the occurrence were analyzed utilizing doppler weather radar. A convective cloud system with a length of up to 60 km and a reflectivity of 55 to 60 dBZ was detected hitting the airport runway. The intensity of the magnitude evokes the formation of a strong gust front (GF) and downburst. GF with a length of 62.83 km produces a mass of cold air up to 20 – 25 m/s in speed. Further, the combination of a strong downdraft (11 m/s) when hitting the ground (downburst) is visible through divergence patterns. The overall conditions are combined to generate strong winds and trigger the formation of powerful LLWS that critically endanger flights.