Rather Shocking !!
To answer a few questions raised here;
The G73T has
- Autofeather
- Main fuel tanks between the fuselage and the engine
- Wing Aux if fitted, outboard of the engine
- Floats carry fuel as well, although Chalks carried water ballast in there at times ?!
- Wing carry through spar stops at the inboard of the engine and the rest of the wing becomes a spar itself
- Beta equipped PT6-34, specially designed props to stop on the locks for immediate use on water start-up
- Hydraulics on the wings; Reservoir and Accumulator in the left wing, flaps gear and brakes operated by hydraulics
- Chalks CVR, GPWS equipped, am not sure on the FDR
- Comp wash carried out at the end of the flight day
- Inertial Seperater equipped
- One of the fuel filters is located at either leading edge between the engine and the fuselage
- Engine can be run only direct to the main tanks
Just another speculation, although I hate to;
One of the fuel hose could've come off between the main tank and the engine (submerged fuel pumps) and with high pressure wouldn't take much time to pump enough fuel into the wing section to blow it up with the exhaust sliding over the wing
Smoothie....