| 86-01643, Boeing D model kit number M3148, was a CH-47D helicopter. The U.S. Army acceptance date was 23 December 1986. As of 25 February 1988, 86-01643 had accumulated at least 221.0 D model hours and 4,250.3 total aircraft hours.
86-01643 was a conversion from the original B model Chinook 66-19121.
On 5 February 1986, 86-01643 was inducted into the D model program, converted, and initially scheduled for assignment to 2nd Platoon, Company A, 2nd Battalion, 158th Aviation Regiment, 47th Hospital, 214th Field Artillery Brigade, 3rd Corps, Forces Command (FORSCOM), located at Fort Sill, Oklahoma, and remained there until it was lost due to an accident.
On 25 February 1988, 86-01643 was enroute and returning to home station.
Near Chico, Texas, while in cruise flight at approximately 2000 feet mean sea level (MSL) and at 120 knots ground speed, a pop was heard, followed by the sound of a loud explosion. The drive train from the number 2 engine failed.
As a result, the engine over-sped, causing the number 2 engine power turbine wheel to exceed the centrifugal rotation limitations, causing the power turbine blades to enter the aircraft fuselage and an in-flight fire began.
The cabin area filled with dense black smoke that traveled forward and entered the cockpit.
The cause of the drive train failure could not be determined.
Witnesses observed fire and smoke coming from the rear of the aircraft, as well as several parts falling to the ground. Fire and smoke was also observed in the rear of the aircraft.
As smoke filled the cabin and entered the cockpit, an emergency descent was initiated. The aircraft touched down in a landing attitude at approximately 130+ knots.
The aircraft was totally destroyed by impact forces and in-flight/post crash fire.
The Pilot, Copilot, and Flight Engineer were fatalities. The Crew Chief survived crash.
Six passengers were fatalities. Eight passengers were seriously injured. There were a number of minor injuries to other passengers. The total number onboard was 18 (4 crew members and 14 passengers to include unit First Sergeant (1SG).
As of 25 February 1988, the last known location of 86-01643 was near Chico, Texas.
Aircraft status: Crashed.
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