What does CWT stand for?

The load consists of section 43, a forward fuselage section made by Kawasaki Heavy Industries, and section 11/45, the center wheel well and center wing tank, made by KHI and Fuji Heavy Industries and joined at FHI.

It said the first Dreamlifter made a successful pickup last week of the first 787 parts produced in Japan, including a forward fuselage section made by Kawasaki Heavy Industries and the center wheel well and center wing tank made by KHI and Fuji Heavy Industries.

The source of ignition energy for the explosion could not be determined with certainty," the NTSB said, but of the possibilities explored during the investigation, "the most likely was a short circuit outside the center wing tank that allowed explosive voltage to enter it through electrical wiring associated with the fuel-quantity indication system" - the low-voltage fuel-gauge system.

The leading theory has long been that an internally caused explosion of the plane's center wing tank broke it apart shortly after departure for Paris from New York.

Chafed float-switch wires inside center wing tanks recently were found in eight 737-200s operated by seven airlines.

A leading theory is that an electrical malfunction enabled a spark inside the center wing tank to ignite hot fuel vapors.

Boeing has found what the Federal Aviation Administration says is another potential spark source inside the center wing tank of the Boeing 747, the fuel system of which has been under a microscope in the two years since the explosion of TWA Flight 800.

They would shield and isolate low-voltage, fuel-measuring wires leading into 747 center wing tanks from high-voltage wires for other systems.