HONOLULU (KHON2) -- Federal investigators from both the FAA and NTSB are in Honolulu to determine what went wrong, causing Tuesday's deadly plane crash. Get Hawaii's latest morning news delivered to your inbox, sign up for News 2 You Investigators will examine every possible factor in the tragic crash, including recordings with air traffic control, aircraft maintenance records, the weather at the time, witness statements, and any video—all in an effort to understand what happened. Charred bricks remain on the building and debris is scattered across the parking lot. It's all that's left after Kamaka Air flight 689 crashed shortly after takeoff, killing pilots Hiram Defries and Preston Kaluhiwa. "I'm not sure what happened to cause that, but they were in a very steep bank and possibly at a low speed, which could have created a stall-spin scenario. It was hard to tell," said David Evans, an airline transport pilot and flight instructor. The pilots reported "control anomalies" shortly after takeoff. The NTSB said its investigation looks into three primary areas: the pilot, the aircraft, and the operating environment. Pilot who died in Honolulu crash ‘Loved to soar through the skies’ Kamaka Air said both men on board were licensed pilots. They were on their first takeoff for a practice flight for Defries' check flight—a test flight—scheduled for Wednesday. Kamaka Air added they were the second crew to fly that day. Pilots do a walk-around visual inspection before every flight. "Can it function and perform its basic duties from the visual inspection that you give it?" said Evans. "And in conjunction with that, knowing that it has had an annual inspection or a hundred-hour inspection, you can determine whether the airplane is fit for flight or not." Evans said planes can fly as long as they're maintained. According to FAA records, the Cessna 208 that crashed was manufactured in 2011 and last certified in February 2022. "Generally speaking, flying is safe," said Evans. "It's generally safe, both at the commercial level when you're flying from Hawaii to the mainland, or when you're operating a Cessna 208, like these two pilots were. It's generally safe. But like everything, there's always an element of risk." The NTSB is expected to release a preliminary report on its findings within the next 30 days. Download the free KHON2 app for iOS or Android to stay informed on the latest news A final report, which will include the probable cause and determining factors, could take from 1 to 2 years.