A DPS operator identified the victims as 60-year-old Carlos McKinney, of Kerrville, 13-year-old Dylan Lord and 12-year-old Brendon Lord.
Trooper Randy Vick's report said the FAA cited aircraft malfunction as the cause of the crash.
Lynn Lunsford, a spokesman for the FAA, said the plane was at about 9,000 feet when controllers lost radar contact.
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