These are decidedly not Good Times for actor John Amos. Although he's currently appearing on two prime-time television shows — "The District" and "The West Wing" — a knee injury has momentarily sidelined his stage work.

On March 18, Amos was supposed to bring his one-man show, Halley's Comet, to the Helen Hayes Performing Arts Center in Nyack, NY. It's a play that Amos has been touring with for more than ten years. However, two weeks ago, Amos had minor surgery on his knee. Ordinarily, the injury would have healed sufficiently for him to make the March 18 gig. However, according to Hayes Center marketing director Oscar Sales (reached March 16), "His knee was still bothering him, so he went back to the hospital yesterday and had his knee worked on again." There was no way, though, for him to do Halley's Comet the day after surgery.

Asked how the Hayes Center copes with a last-minute cancellation, Sales told Playbill On-Line, "Everyone that has purchased tickets we've called and told them it won't be happening, and we'll refund their money. They'll have first option to buy tickets again once we have a new date. We've also contacted the local newspapers, and a couple ran articles about the cancellation."

Halley's Comet tells of an 87-year-old man reflecting on his life in the 76 years since he first saw the astronomical wonder. Actor Amos is best known for the TV miniseries "Roots" and for playing James on the hit sitcom "Good Times."

For information on shows at the Helen Hayes Center call (845) 358-6333. — By David Lefkowitz