PHOENIX (AP) - The investigation into problems with Boeing's 787 "Dreamliner" has shifted to Arizona.
The Arizona Republic (http://bit.ly/10Ffgoi) reported Tuesday that the National Transportation Safety Board was visiting companies in Phoenix and Tucson involved in making components of the plane's auxiliary power unit system.
The Japanese-made battery believed to be the source of a 787 Dreamliner fire in Boston this month was connected to the plane's auxiliary power unit, or APU.
NTSB investigators reportedly traveled to Arizona to test related products made by Securaplane Technologies Inc. of Tucson, and Pratt & Whitney Engine Services of Phoenix.
Securaplane makes the charger for the Dreamliner's APU batteries while Pratt & Whitney produces the APU itself.
Both Securaplane and Pratt & Whitney officials say they will cooperate with the investigation, but they decline further comment.