Leesburg officials are traveling to New York City to see municipal bond-rating firms this week as the Town Council prepares to approve a $4 million bond issue March 23 for sewer, road and airport improvements.

About $2 million of the bond money would be used for the planned $8 million expansion of the sewage treatment plant on Rte. 7 just east of town. Federal funds would pay for 75 percent of the expansion, expected to begin this fall and take two years.

The town has been planning the expansion, which will serve the area the town is now annexing from Loudoun County, for seven years. The bond sale will come at a good time, according to town engineering director Andrew Shope, because bond interest rates have finally begun dropping and next year is the last year during which 75-percent federal matching money will be available for such municipal sewer projects.

The major portion of the remaining $2 million in bond money would go to construct a $825,000 flight service station at Leesburg Airport for the Federal Aviation Administration (which last month announced it would locate its new regional flight service station at the airport), plus $205,000 for a new airport terminal and $290,000 to extend a sewer line to the airport, which now operates its own small sewerage system.

Another $680,000 would go toward road improvements needed to complete So. Harrison Street and Catoctin Circle.