LEBANON — City Manager Shaun Mulholland isn’t saying what happened to prompt the city to replace long-time airport manager Rick Dyment with the city’s fire chief.

“It’s a personnel matter, so I can’t discuss this,” Mulholland said.

Dyment did not respond to a request for comment. Fire Chief Chris Christopoulos is now in charge of the airport.

Dyment had the responsibility of the day-to-day operations at the airport taken away from him on Dec. 26. He is still employed by the city, Mulholland said.

Lebanon’s airport offers limited commercial service through Cape Air, which has flights to Boston and White Plains, N.Y. It also offers hangar space for private planes and helicopters.