In Time Flyer, the “Disney Sunday Movie”...

In Time Flyer, the “Disney Sunday Movie” (ABC at 7 p.m.), Huckleberry Fox plays an 11-year-old who travels back to 1927 in a time machine to try to prevent his own aviator-grandfather from making a fatal transatlantic flight. Peter Coyote and Art Carney also star. Time Flyer is followed at 9 p.m. on ABC by Part I of Harem, another new TV movie. Newcomer Nancy Travis plays a turn-of-the-century American who is kidnaped and sold into a Turkish harem. Also starring are Omar Sharif, Ava Gardner, Sarah Miles and Yaphet Kotto. Harem concludes Monday at 9 p.m.

Two more TV movies premiere Sunday night. Peter Strauss, Hal Holbrook, E. G. Marshall and Paul Winfield star in Under Siege (NBC at 8 p.m.), which imagines how America would respond to its first battle with domestic terrorism. (One of the film’s four writers is journalist Bob Woodward of Watergate fame.) Lindsay Wagner and Peter Coyote star in Child’s Cry (CBS at 9 p.m.), a drama about a social worker trying to discover the reason why a 6-year-old boy (Taliesin Jaffe) has undergone a radical personality change.

An Officer and a Gentleman (NBC Monday at 9 p.m.) is a slick, entertaining, old-fashioned heart-tugger about a couple of naval-aviation cadets (Richard Gere, David Keith) who become involved with some townies (Debra Winger, Lisa Blount) while attending the rigorous Officer Candidate School in Puget Sound. Taylor Hackford directed, Douglas Day Stewart wrote the script and Louis Gossett Jr. walked off with an Oscar as a super-tough drill instructor.

Airing Monday at 7 p.m. on Channel 5 is the corny, cliche-ridden but star-studded and easy-to-take How the West Was Won, a saga about a New England family setting out on the long trek westward in 1839. John Ford, Henry Hathaway and George Marshall directed.

There’s much to recommend in Ike: The War Years (Channel 11 at 9 p.m. Monday and Tuesday), but Eisenhower is so familiar a figure it’s hard to accept Robert Duvall, as fine an actor as he is, in the title role.

Class (Channel 13 Tuesday at 8 p.m.) is precisely what this silly, shallow nonsense lacks. “Crass” would be a more accurate title for this tale about a young prep school student (Andrew McCarthy) seduced by gorgeous Jacqueline Bisset, who just happens to be the mother of his roommate (Rob Lowe). The cast is game but the material is so gamy that the film is no more than a leer.

Edward Asner, Gary Cole, Kate McNeil and Barbara Barrie star in the new TV movie Vital Signs (CBS Tuesday at 9 p.m.), a drama about an alcoholic doctor (Asner) and his drug-dependent son (Cole), also a doctor.

Airing Tuesday at 8 p.m. on Channel 5 is Burt Kennedy’s amiable comedy-Western, The War Wagon, starring John Wayne and Kirk Douglas. Another entertaining Western, the made-for-TV Shadow Riders, airs Wednesday, also at 8 p.m. on Channel 5. Based on a Louis L’Amour story, it stars Tom Selleck and Sam Elliott as brothers searching for their family, kidnaped by Rebels during the Civil War.

Thursday brings the lousy Valachi Papers (Channel 13 at 8 p.m.), which wastes the fascinating account of Mafia soldier Joseph Valachi (played by a miscast Charles Bronson), and The Bridges at Toko-Ri (Channel 11 Thursday at 9 p.m.), an uncompromising Korean War story starring William Holden and Grace Kelly.

In Norman Jewison’s Best Friends (ABC Friday at 9 p.m.) Goldie Hawn and Bert Reynolds are appealing as a couple who have lived together and worked together (as screenwriters) for some years and at last decide to marry--which means a honeymoon consisting of introducing each other to their respective parents. But the film, unfortunately, is crass; it presents Hawn and Reynolds in the round only to satirize heavily all the peripheral people, most of whom are weighed down in shtick.

Fred Schepisi’s Barbarosa (Channel 5 Friday at 8 p.m.) is a glorious, mostly lighthearted adventure celebrating the mythical freedom and excitement of the outlaw life in the Old West. Big, raw-boned Gary Busey is a farm boy who has accidentally shot and killed a neighbor and is now on the run when he crosses paths on the Texas desert with Barbarosa (Willie Nelson), a fabled outlaw who for years has eluded the vengeance of proud don Gilbert Roland for having dared to marry Roland’s daughter (Isela Vega). Written by William D. Witliff, Barbarosa reveals the folly of revenge and macho pride as it revels in the hairbreadth adventures and exploits of Busey and Nelson. Above all, the film is a deeply affectionate, good-natured and funny musing on our need for legends and our determination to sustain them.

Also airing Friday is John Boorman’s Hell in the Pacific (Channel 11 at 9 p.m.), that well-sustained encounter between an American (Lee Marvin) and a Japanese (Toshiro Mifune) on a small island during World War II, and St. Ives (Channel 13 at 8 p.m.), a diverting, though complicated B thriller starring Charles Bronson and Jacqueline Bisset.

Once again Dorothy, the little Kansas farm girl, and her dog Toto will trek down that Yellow Brick Road in The Wizard of Oz (CBS Saturday at 8 p.m.). Judy Garland, of course, is Dorothy, Ray Bolger the Scarecrow, Jack Haley the Tin Man, Bert Lahr the Cowardly Lion and Margaret Hamilton the Wicked Witch of the West in this 1939 classic.

John Huston’s film of Kipling’s The Man Who Would Be King (Channel 9 Saturday at 10 p.m.) is an old-fashioned adventure in which Michael Caine and Sean Connery are a pair of roguish British ex-regimentals in search of a country where a man might just end up a king.

The Divorce of Lady X (Channel 28 Saturday at 10 p.m.) is a stylish 1938 boudoir comedy teaming Merle Oberon and Laurence Olivier.

Selected evening cable fare: Fires Over England (Nickolodeon at 6 Sunday and Thursday); The Mean Season (Cinemax Sunday at 8, Z Saturday at 9); Rocky (Showtime Sunday at 8, SelecTV Sunday at 9 and Thursday at 7); The Breakfast Club (Movie Channel Sunday at 10, Cinemax Tuesday at 8, Movie Channel Wednesday at 6, SelecTV Wednesday at 7, Showtime Friday at 8, Z Friday at 9); Into the Night (SelecTV Monday at 9:30); The Brother From Another Planet (SelecTV Tuesday at 7); The Fury (Z Tuesday at 7); The Hidden Fortress (Z Wednesday at 6:30); Starman (HBO Wednesday at 8); Maria’s Lovers (SelecTV Wednesday at 9); Dodsworth (Z Thursday at 7); I Remember Mama (SelecTV Thursday at 9); Blood Simple (Z Thursday at 9); Mrs. Soffel (HBO Thursday at 10:15); The Karate Kid (Cinemax Friday at 8); The Wicker Man (WOR Saturday at 8:30).