A further update as to the cause of the crash.
The Boeing AH-64 Apache is a twin-turboshaft attack helicopterwith a tailwheel-type landing gear arrangement and a tandem cockpit for a crew of two. It features a nose-mounted sensor suite for target acquisition and night vision systems. It is armed with a 30 mm (1.18 in) M230 chain gun carried between the main landing gear, under the aircraft's forward fuselage, and four hardpoints mounted on stub-wing pylons for carrying armament and stores, typically a mixture of AGM-114 Hellfire missiles and Hydra 70 rocket pods. The AH-64 has significant systems redundancy to improve combat survivability. Hughes aircraft developed and built the Apaches. Boeing acquired Hughes, so now it is the Boeing Apache.
About six months after the crash, I received a copy of the investigation report that was heavily redacted. From that primarily report I learned there was absolutely no pilot error. I already knew weather was not a factor. I also learned maintenance was not a factor. Both pilots were clean - no drugs or alcohol in the system of either pilot. And both pilots were current and qualified.That leaves a mechanical failure; but the nature of the failure was redacted.
The AH-64 Apaches were in combat at the time (as they are today). So the cause was classified until it could be corrected throughout the Apache fleet.
The Apache has two pilots, a pilot in command (PIC) and a copilot who also serves as the weapons officer. The PIC was CW3 Kent Walker, a Viet Nam combat veteran thousands of flying hours. Either pilot can fly the aircraft and both were fully qualified and trained to fly it.
The Apache has two fuel tanks, fore and aft. There is a valve called the crossover valve between the two tanks. This valve feeds the two jet engines. The pilot or copilot can set the valve to draw from one tank or the other or draw from both simultaneously. This is how they keep the aircraft balanced. It was this crossover valve that failed. It simultaneously shut the fuel draw from both tanks and the engines flamed out with seconds of each other. It was a simultaneous dual flame out.
Justin's unit had been called to active duty for deployment to Bosnia. They were undergoing the requisite trainup that all units undergo prior to deployment. One of the tactics the Apaches employ is to fly at tree level, pop up, take shot, and go back down and hide in the trees. This is what they were practicing. They were at tree top level (150-200 feet) when the dual flame out occurred. There was no time to auto rotate. Kent managed to get all of the electrics shut down before impact. The helicopter came down through thick timber nose first. The rotors were not turning so the tops of the trees were not sheared. The canopy closed over the aircraft and it could not be spotted from the air. It took ground search parties a couple of hours to find them.
There had been three other Apache crashes in the previous 18 months from undetermined causes. In each of these cases, the aircraft burned completely. In this case the helicopter was intact. Thus the Army and Boeing were able to pinpoint the cause. Without getting technical, with a certain amount of fuel (less than half) and at a certain flight attitude (angle of bank) the crossover valve would shut off all fuel. Based on this evidence, this is the probable cause of the other three crashes. There would have been more crashes had Justin's helicopter burned. Boeing and the Army corrected the problem with a redesigned crossover valve and retro fitted them. Lives were saved.