UNAUTH UNCOORD LNDG AFTER A CLASS D AIRSPACE INCURSION BY A GRUMMAN TIGER TRAINING FLT INTO MRB; WV.

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I WAS SITTING R SEAT IN MY GRUMMAN TIGER OBSERVING THE FLYING SKILLS OF A NEW MEMBER IN MY FLYING CLUB. HE IS A 200 HR INST PLT WHO WAS CHKED OUT IN MY PLANE BY A CFI AND PUT ON OUR INSURANCE. WE FLEW TO MRB; WE CALLED TWR ON 124.3 ABOUT 8 MI S. THERE WAS NO ANSWER AND NO ONE TALKING ON THE RADIO. WHILE THE PLT WAS PRACTICING HIS DSCNT AND BEFORE LNDG CHKLIST; I PUT HIM ON A WIDE SIMULATED RADAR DOWNWIND OUTSIDE OF THE CLASS D; E; G AIRSPACE. THE WINDS WERE CALM; SO I DEMONSTRATED HOW TO HOOK THE AUTOPLT TO THE BACK COURSE RWY 8 APCH. WE HAD A 14 MI STRAIGHT-IN. THE PLT FLYING CALLED THE TWR AGAIN ON 124.3 AT 8 MI AND AGAIN NO ANSWER. WE ASSUMED THE TWR WASN'T IN OP. ALL OUR LIGHTS WERE ON! WE SAW NO LIGHT GUN SIGNALS FROM THE TWR. WE LANDED RWY 08; THEN XMITTED IN THE BLIND -- BACK TAXI RWY 17 -- TO GET ON THE TXWY FOR A RWY 8 TKOF. WE TOOK OFF RWY 8 AND UPON A 45 DEG (NE) TURN OUT OF THE PATTERN; GOT A RADIO CALL FROM TWR ON 124.3 TO 'CALL IMMEDIATELY.' WE TALKED ABOUT EVERYTHING. THE CTLR SAID THAT 'WE ARE HAVING A PROB WITH THIS; IT HAS HAPPENED 3 TIMES IN THE LAST WK! 'HE TOLD ME TO CHK MY RADIOS.' THERE WERE NO OTHER AIRPLANES AROUND FLYING. NO READINGS ON TCASII! WE HAD ALL OUR LIGHTS ON. IN THE FUTURE: CHK AND READ SECTIONAL CHART HRS OF OP; DON'T ASSUME CTAF IF NO ANSWER. BROADCAST ON GUARD IF NO RESPONSE ON RADIO. FACTORS: TRAINING NEW PLT IN CLUB; NOT ACTUALLY KNOWING HIS FLYING ABILITY (OR HIM) OR MENTAL ABILITY.