AN LTT LANDED WITHOUT TWR CLRNC DURING AN ERRATIC CHK RIDE IN BAD WX.

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MY COMPANY'S POLICY IS TO HAVE CHK AIRMAN INSTRUCTOR PLTS FLY WITH FO'S AFTER THEY ARE TRAINED AND CHKED OUT; ON LINE OPS PRIOR TO THEM BEING RELEASED TO REGULAR LINE CAPT'S. I AM A CHK AIRMAN AND WAS ON THE LAST LEG OF A 2 DAY TRIP WITH A NEW FO. HE HADN'T BEEN DOING TOO WELL BUT WAS MAKING PROGRESS. IT WAS HIS LEG AND HE WAS THE PF. WE HAD BEEN VECTORED FOR A TIGHT APCH AROUND NUMEROUS RAIN SHOWERS IN THE AREA. WE WERE CLRED TO INTERCEPT THE FINAL APCH COURSE; CLRED FOR THE APCH AND TO CONTACT TWR. DUE TO MY FO'S INEXPERIENCE; I WAS TALKING HIM THROUGH THE APCH WHILE COMPLETING THE APPROPRIATE CHKLISTS. WX WAS STARTING TO MOVE ONTO THE FIELD. I FOCUSED MY ATTN ON THE RADAR FOR A FEW SECONDS; THEN NOTICED MY FO HAD ADDED A LOT OF PWR AND WAS STARTING TO EXCEED FLAP SPDS. I TOOK THE ACFT AND THE PWR; STABILIZED IT AND HANDED CTL BACK OVER TO THE FO FOR LNDG. AFTER THE LNDG; I REALIZED WE WERE STILL ON APCH CTL FREQ. AFTER I CONTACTED TWR; HE ISSUED RWY XING INSTRUCTIONS AND VOLUNTEERED. 'BY THE WAY YOU WERE CLRED TO LAND'. UNFORTUNATELY; EVENTS LIKE THIS MAY HAPPEN; BUT IF IT INCREASES OUR OVERALL DILIGENCE; THEN WE ARE BETTER OFF. AVIATION IS A HUMBLING FIELD.