Fleet of helicopters to stay grounded as investigators still can't determine why the aircraft's left motor caught fire and why the pilots couldn't escape in last week's accident
Report says electrical short hampered pilots ability to control helicopter during crash landing, aircraft hit water on its right side and sank with two crew members still on board
Investigators looking into why pilots didn't escape the chopper during emergency landing like naval officer, who survived and called the squadron commander to report the crash
Navy, air force chiefs hail Capt. Ron Berman, who managed to escape aircraft, call for help from his cellphone while floating at sea; now recovering in hospital