premise: A Casa-212 aircraft owned by the Indonesian air force disappeared while on a flight from the capital Jakarta to Bogor in West Java Friday morning. The plane was carrying 12 Indonesian military personnel and 6 civilians including a British, Singaporean and Indian national. The plane was tasked to test a new digital camera designed to conduct aerial mapping and topography. The aircraft was last sighted on radar in the Salak moutain region on the main island of Java, 90 kilometers (60 miles) southeast of the Indonesian capital. The Indonesian military has deployed a search and rescue team in the area. Authorities fear that the aircraft crashed in a densely forested area making any rescue difficult. Air Force spokesman Chaeruddin Ray said the region was covered in thick fog and in a rough terrain.
hypothesis: A Casa-212 aircraft belonging to Indonesian air force disappeared in the Salak region.