Monday morning saw a couple of major changes in the early morning lineup for local viewers ...

You won't be terribly surprised that staffers at both Channel 5 and Channel 4 insisted yesterday they were happy with the first results ...

The 2 1/2-hour "Fox Morning News" that debuted on Five at 6:30 in the morning didn't perform as well as the half-hour "CNN Headline News" and the two hours of cartoons that it replaced ...

But Five management was heartened by the fact that "Fox Morning News" managed to tie the "Today" show on Four over the 7 to 9 a.m. time period on Monday ...

Fox News averaged a 2.3 local Nielsen rating and a 14 share at 6:30 and a 2.7/13 from 7 until 9 ...

Over at Four, local news averaged a 2.4/15, while "Today" did a 2.7/13 ...

At Nine, the 6 to 7 a.m. local news show averaged a 4.9/35 but dropped to a 2.9/14 for the two hours of "CBS This Morning" ...

At Seven, local news did a 2.5/15, but network front-runner "Good Morning America" won the two hours that followed with a 3.8/18 ...

Each local ratings point represents 17,278 TV homes ...

Over at Four, "The Mac McGarry Summer Comedy Club" premiered at 9 a.m. Monday with a 2.4/11 from 9 to 10 a.m., almost double the May ratings average put on the boards by the Steve Doocy "House Party" show it bumped to a 2:30 a.m. timeslot ...

As for Mac's competition, "Geraldo!" on Seven averaged a 4.8/23, the "Donahue" show on Nine did a 3.9/18, while "I Love Lucy" on Five did a 3.2/15 ...

Ted Turner's Turner Broadcasting System, Inc. has had one of the toughest campaigns against smoking on the job in the business since November 1986 ...

That's when TBS, after a year of study, instituted a policy under which smokers would no longer be hired. If you smoked, you had to pledge to give it up. Old-time smokers at TBS were restricted to designated smoking areas if they really needed a couple of puffs (the company is now considering eliminating the designated smoking areas too) ...

Okay, so that's not news. What does seem odd is that when a five-year employee recently received the traditional congratulations from Atlanta headquarters on the occasion, the usual list of gifts from which the employee could choose to mark his anniversary still contained an offer for (are you sitting down, Ted?) a free cigarette lighter!! ...

Are you sitting down, Airwaves? Those first two items this morning suggest it's going to be a long haul for TV Column fans. Please stand up from now on ...

TV RATINGZZZZ

Following are the top 20 network prime-time shows last week, ranked according to the percentage of the nation's 92.1 milllion TV households that watched, as measured by the A.C. Nielsen Co. A share represents the percentage of actual sets-in-use tuned to a particular program when it aired.

......RATINGS..................................SHARE...NETWORK

1.....15.1.....Cheers............................28.....NBC

2.....15.0.....Roseanne..........................27.....ABC

3.....13.9.....The Cosby Show....................29.....NBC

4.....13.8.....Empty Nest........................29.....NBC

5.....13.6.....60 Minutes........................32.....CBS

6.....13.5.....The Golden Girls..................30.....NBC

7.....13.4.....Seinfeld..........................24.....NBC

......13.4.....Coach.............................24.....ABC

......13.4.....Married ... With Children.......24.....FOX

10....13.3.....A Different World.................27.....NBC

......13.3.....The Simpsons......................25.....FOX

......13.3.....Designing Women...................23.....CBS

13....13.2.....Unsolved Mysteries................25.....NBC

14....12.6.....In Living Color...................23.....FOX

15....12.5.....Rescue: 911.......................24.....CBS

16....12.2.....20/20.............................25.....ABC

......12.2.....L.A. Law..........................24.....NBC

......12.2.....She Knows Too Much................23.....NBC

19....12.1.....Murphy Brown......................21.....CBS

20....12.0.....Full House........................26.....ABC

NBC continued at the top of the weekly ratings heap, but the drop in viewership for the big boys continues ...

NBC led with a 10.3 rating and a 20 percent share, followed by ABC at 9.0/18 and an 8.8/17 for CBS ...

That figures out to a cumulative rating of 28.1/55 for the week ending June 24 and compares with the 30.6/50 the three networks averaged a year ago this week, a falloff of 2.3 million homes ...

FOX, with three shows in the Top 15 for the first time ever, picked up some of the audiences, however, no consolation to ABC, CBS or NBC. FOX has previously had three shows in the Top 20 ...

Not that you can entirely blame viewers; 63 of the 86 programs aired last week on all four networks were repeats ...

Only "Seinfeld," "In Living Color," "20/20" and the introductions to segments on "60 Minutes" were new in the Top 20 ...

Among other original shows last week, ABC's "Equal Justice" was 36th, ABC's "Dr. Ruth's House" pilot was 43rd and CBS's "The Dave Thomas Comedy Show" was 47th ...

"The World's Greatest Stunts" special on FOX tied for 50th, NBC's "Singer & Sons" tied for 54th, NBC's "Bodyguard" was 59th; NBC's "Hardball" was 64th and FOX's "America's Most Wanted" was 65th ...

"Sporting Chance" on CBS was 66th, ABC's "Super Jeopardy!" was 69th, ABC's "Monopoly" tied for 70th and a new "Snoops" on CBS was 75th ...

CBS's "Normal Life" tied for 79th, the ABC News "Koppel Report" featuring a town meeting with Nelson Mandela was 81st ...

Now This

From now on maybe we oughta call it "North America's Most Wanted." Anyway, FOX has announced that "America's Most Wanted" will also include wanted lists from the Royal Canadian Mounted Police of Canadian criminals living in the United States ...

The first program profiling Canadian fugitives will be a remote from Toronto on July 29 ...

"ABC World News Tonight With Peter Jennings" won the network race for the 24th week in a row with a 9.0 rating and a 20 share. "CBS Evening News With Dan Rather" was second at 8.3/19 and "NBC Nightly News With Tom Brokaw" was third at 8.1/19 ...

The House subcommittee on telecommunications and finance will mark up the cable bill this afternoon ...

Changes at NBC News, where Jeannee von Essen, a CNN vice president for foreign news since 1983, has been named director of foreign news development and Jeffrey Gaspin has been named director of program development and planning. He's been director of financial planning and analysis for the division ...

Jim Greiner, who has been president and chief operating officer of SportsChannel America since March 1989, has been named senior vice president for financial operations and business developments at NBC News ...

And Jim Dick, senior news producer for "Today," has been named morning news director, adding responsibility for Sunrise newscasts and morning News at This Hour newsbreaks ...

"The Cosby Show," partly in response to the FOX network move pitting "The Simpsons" against it this fall on Thursday nights, has been making some changes on- and off-camera ...

Erika Alexander will join the show in September as Clair Huxtable's second cousin Pam. Illness in her family causes her to leave Bedford-Stuyvesant and join the well-to-do Huxtables and "her less-privileged background brings a fresh perspective of life to the Huxtable family," according to NBC ...

Tempestt Bledsoe, who plays Huxtable daughter Vanessa, will be attending NYU this fall so she won't be in the series as often ...

Cosby has also added a new co-executive producer and a raft of new writers to the staff ...

CBS News's "48 Hours" has added Phil Jones, Harold Dow, Erin Moriarty and Richard Schlesinger as staff correspondents ...

Channel 7 anchor Renee Poussaint was one of several hosts scheduled to introduce prominent guests last night at Nelson Mandela's Washington Convention Center rally, one of the city's best opportunities to view the South African leader up close during his busy stay in the nation's capital ...

Coincidentally, Channel 7, like Channel 5, chose not to have live coverage of Mandela's address at the rally, although both Four and Nine preempted network programming for the speech ...

Bob Reichblum, Seven's news director, said yesterday he had no qualms about journalist Poussaint serving as a host of such a politically significant event ...

"First of all," said Reichblum, "she's not covering it and secondly, part of what we think helps people understand the community they cover is to participate in community events of great interest. I've never seen an event compromise Renee's objectivity and I certainly believe she's done as balanced a job of covering the Mandela story as anybody in town" ...

Allan Horlick, general manager of very competitive Channel 4, said yesterday he too saw nothing at all wrong with Poussaint's participation in the program. "It's a celebratory event and I have no trouble with it whatsoever from a journalistic standpoint" ...

Poussaint and a number of community leaders were scheduled to serve as hosts during the rally, according to planners ...

Reichblum said the decision not to provide live coverage of the Mandela speech was made, in part, because of extensive coverage already by both the ABC network and the station of Mandela's visit to the United States, including live coverage of his historic appearance before a joint meeting of Congress yesterday ...

That two-hour sports special on ABC Monday night averaged a 7.0/13 from 9 to 11:04. And "Quantum Leap Week" was launched on NBC with a 10.5/20 for the "Quantum" rerun at 10 p.m. ...