The Portland Trail Blazers announced that center Sam Bowie will miss the remainder of the season. A cast was removed Tuesday from the right leg of the 7-foot-1 Bowie, who refractured his right tibia on the night of Portland's first exhibition game this season.

Dr. Robert Cook said he wants to be "ultraconservative" this time with the Portland center, who suffered a fracture of the left tibia during the 1985-86 season and originally broke the right tibia in the fifth game of the 1986-87 season. Bowie underwent bone-graft surgery and was free of pain when the Trail Blazers opened training camp this season, even though the fracture line was still present on the X-ray . . .

The Detroit Pistons are the only NBA team that has its own plane, and Coach Chuck Daly says being able to travel in comfort has saved a few hours of sleep and even a few victories.

The BAC1-11 twin-jet aircraft, converted to hold 29 tall passengers, is "too good to be true," Daly said. "It's like winning the lottery."

The aircraft, with a crew of two and two flight attendants, was refitted for the Pistons and furnished with couches and swivel captain's chairs. It also has two VCRs and is so spacious Daly can walk his team through some plays if he has the urge.

Club owner William Davidson paid $2 million for the plane, and it will cost the team about $500,000 to operate this season.