Because the aircraft was not fitted with a
flight recorder, the Indonesian
National Transportation Safety Committee primarily relied on the wreckage pattern, and the pilot's flight history, for the investigation. On 1 July 2015, all of the ammunition and two engines from the aircraft were removed from the crash site. The
Indonesian National Armed Forces (TNI) said that they would pay the insurance claims, which totalled
Rp 2.25 trillion (roughly US$170 million). The investigation was expected to be completed in two weeks. The preliminary report was not made public. The aircraft was one of ten C-130Bs given to Indonesia by the United States in exchange for an imprisoned
CIA pilot, captured during the
1957–1961 Sulawesi rebellion. The aircraft suffered from a shortage of spare parts after the US enacted an embargo (9 September 1999 – 22 November 2005) on Indonesia over their part in the
1999 East Timorese crisis. In view of the aircraft's age, the crash sparked public outcry over the state of the Indonesian Air Force Hercules fleet. However, Indonesian officials denied that the aircraft's age was a factor in the crash, and insisted it was in "good condition". On 3 July 2015, it was reported that the number four engine propeller had malfunctioned before the aircraft hit the tower, indicating a
mechanical failure. All four of the aircraft's engines were recovered from the crash site as part of the investigation. Roughly 90% of witnesses reported that the aircraft struck a mobile phone tower before it crashed. The tower was found to be illegal, according to an Indonesian official. As a result, the Indonesian
People's Representative Council advised that "illegal towers" anywhere in Indonesia had to be removed, as they were "ugly" to the scenery and "dangerous" for safety. President
Joko Widodo and Vice President
Jusuf Kalla agreed to the need to retire old aircraft in the Indonesian Air Force's fleet, to prevent a similar tragedy. ==See also==