UPDATE 1-Boeing 787 schedule to be known in weeks - CEO

* Boeing CEO says to know 787 schedule over next few weeks

* Shares down 35 cents

CHICAGO, Dec 15 (Reuters) - Boeing Co BA.N expects to know over the "next few weeks" what impact a 787 Dreamliner electrical glitch will have on the plane's production and delivery schedule, the company's chief executive said on Wednesday.

“Over the next few weeks we’ll get the production schedule better understood as we work with the FAA (U.S. Federal Aviation Administration) on the fix to the incident we had on the Dreamliner,” Jim McNerney told CNBC in a television interview.

Test flights for the light-weight, carbon-composite plane were halted in November after a problem with the electrical system caused a fire on one of the planes.

The Dreamliner is nearly three years behind its original schedule because of production and labor problems. The company has said the latest problem will delay first delivery, which currently is set for the middle of the first quarter of 2011. But Boeing has yet to issue a new delivery schedule.

Shares of Boeing, a Dow component, were down 35 cents at $64.14 on the New York Stock Exchange. (Reporting by Kyle Peterson, editing by Gerald E. McCormick)