FRIDAY Chiefs (CBS, 9-11 p.m., also Saturday and Sunday): Repeat of bizarre three-part miniseries about race relations and crime in a small Southern town. Charlton Heston, Wayne Rogers, Brad Davis, and Billy Dee Williams star.
The Magic Flute (PBS, 9-10 p.m.): Repeat of Peter Martins's ``Dance in America'' special. SATURDAY
Green Energy (PBS, 7:30-8 p.m.): ``Innovation'' looks at how biological and organic products might be used as energy sources of the future.
Our Time (NBC, 8-8:30 p.m.): Amusing new summer series about baby-boom generation and their adjustment to the 1980s (see today's preview).
The Biggest Lump of Money in the World (NBC, 10-11 p.m.): Fact-filled NBC White Paper about your pension fund and how safe it is (see today's preview). SUNDAY
Evening at Pops (PBS, 8-9): Yo-Yo Ma, world-renowned cellist, joins John Williams and Boston Pops.
Aguas Negras: Black Water Time Bomb (PBS, 10-10:30 p.m.): Documentary looks at problems caused by untreated sewage in Tijuana running into San Diego's water supply. MONDAY
A Desk in the Jungle (PBS, 9-10 p.m.): ``Smithsonian World'' repeat which includes segment on physical anthropologist who works at a tropical research institute in Panama where howler monkey is studied.
Alive From Off Center (PBS, 10-10:30 p.m.): Pulitzer Prize-winning playwright Sam Shepherd's monologue ``Tongues.''
Strange Fruit (PBS, 10:30-11 p.m.): Repeat of American Film Institute original film of Lillian Smith's novel. TUESDAY
Viewpoint (ABC, 11:30 p.m.-1 a.m.): Ted Koppel hosts ABC's live Op-Ed page feature, which looks into media coverage of the TWA hostage hijacking. WEDNESDAY
Flight of the Whooping Crane (PBS, 8-9 p.m.): Repeat of National Geographic special on efforts to save this bird from extinction.
The Little People (PBS, 9-10): Repeat of poignant prizewinning documentary about dwarfs and their subculture.
Hiroshima Plus 40 Years . . . and Still Counting (CBS, 8-9 p.m.): Walter Cronkite hosts an incisive retrospective look at the nuclear age.
Mayport and All That Jazz II (PBS, 10-11 p.m.): Jazz concert with Maynard Ferguson and his band, singer Della Reese, and jazz pianist Billy Taylor.
Check local listings for all programs, especially those on PBS, where local option often results in varying days as well as times.