Federal crash investigators aren't saying how long it will take to determine why an engine on a British Airways jet burst into flames during takeoff in Las Vegas.
National Transportation Safety Board spokesman Eric Weiss said Tuesday the engine teardown is expected to be technically challenging.
He says no immediate updates about preliminary findings are planned.
Flight 2276 to London aborted takeoff Sept. 8, and 157 passengers and 13 crew members escaped down emergency chutes while firefighters doused the flames. No serious injuries were reported.
The burned GE90 engine was removed from the Boeing 777 at McCarran International Airport last week and shipped to a General Electric plant near Cincinnati, Ohio.
The NTSB says fragments of the engine's high-pressure compressor were found on the runway and the engine case was perforated.