On June 30, 2015, a Lockheed C-130 Hercules transport plane operated by the Indonesian Air Force plummeted into a residential neighborhood in Medan, North Sumatra, killing all 139 people aboard and on the ground. The four-engine military cargo aircraft, carrying 122 military personnel and 17 civilians, crashed just minutes after takeoff from Polonia International Airport while attempting to return due to hydraulic failure. The impact devastated homes and buildings in the densely populated area, making it Indonesia's deadliest aviation disaster in over a decade and one of the deadliest military aviation accidents in history.

The Hercules, a workhorse transport plane used by air forces worldwide, had been experiencing mechanical problems since departing from the airbase. Witnesses reported seeing flames trail from the aircraft as it descended sharply toward the city. The plane struck a marketplace and nearby residential buildings, creating a massive fireball that consumed the wreckage and surrounding structures. Emergency responders found it nearly impossible to identify victims due to the intensity of the impact and fire; many were buried in mass graves. The Indonesian government launched a full investigation, ultimately concluding that a combination of hydraulic failure and pilot error prevented the crew from maintaining sufficient altitude to clear the residential area.

The disaster exposed longstanding concerns about maintenance and safety standards within the Indonesian military aviation fleet. The Hercules involved was an older model, and the crash prompted renewed scrutiny of aging aircraft in service across Southeast Asian air forces. The tragedy led to increased pressure for modernization and stricter maintenance protocols. Today it stands as a sobering reminder of the risks faced by military aviators and the devastating consequences when mechanical failures occur over populated areas, claiming more civilian lives than military personnel in the tragedy.