UPDATE 1-Fluor Q3 profit drops, sees decline in 2010 profit

* Q3 EPS 89 cents vs 90 cents view of Wall St

* Trims 2009 EPS guidance to $3.75 to $3.90

* Sets 2010 guidance at $3.20 to $3.60 per share

* End Q3 backlog $28 bln vs $30.9 bln at end Q2

SAN FRANCISCO, Nov 9 (Reuters) - Fluor Corp (FLR.N) posted a lower quarterly profit as energy project spending slowed with the drop in oil and gas prices, and the largest publicly traded U.S. engineering company forecast weaker profit for next year.

Backlog at the end of the third quarter fell to $28 billion, from $30.9 billion three months before and 23 percent from a year ago, the company said on Monday.

Fluor removed $1.2 billion from its backlog due to an indefinitely delayed Russian gas processing expansion. The company also took a $45 million provision due to a collection issue with the completed revamp of a paper mill.

Third-quarter net profit fell to $162 million, or 89 cents per share, from $182 million, or $1.00 per share, in the same quarter a year before. Revenue fell 4 percent to $5.42 billion. Analysts had expected earnings of 90 cents per share on revenue of $5.49 billion, according to Thomson Reuters I/B/E/S.

The Irving, Texas-based company trimmed its 2009 earnings forecast to $3.75 to $3.90 per share, and took a "cautious" view of next year, setting its 2010 profit guidance at $3.20 to $3.60 per share.

Fluor also said it had named David Seaton, currently senior group president for energy, chemicals, power and government, as its chief operating officer. (Reporting by Braden Reddall; Editing by Steve Orlofsky)