AN MD-80 FLC RECEIVED AN APCH CLRNC WITH INSTRUCTIONS TO CONTACT THE TWR AT THE LOM. AT THE LOM; THE FLC WAS ABSORBED IN NUMEROUS TASKS; AND FORGOT TO CONTACT THE TWR. ACR LANDED WITHOUT A CLRNC.

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THE WX AT SEA WAS RAGGED BROKEN TO OVCST CEILING NECESSITATING THE REQUIREMENT FOR INST APCHS. WE WERE ON BASE LEG BEING VECTORED FOR THE FINAL APCH TO THE ILS RWY 16R AT SEA AND IN COMS WITH SEA APCH CTL. WE WERE GIVEN THE FOLLOWING CLRNC: 'TURN R HDG 130 DEGS; MAINTAIN 3200 FT UNTIL ESTABLISHED ON THE LOC; CLRED FOR THE ILS RWY 16R APCH; MAINTAIN 170 KTS TO PARKK (LOM); TWR AT PARKK (LOM.' WE WERE GIVEN THIS CLRNC AT APPROX 12-13 MI DME OUT ON THE APCH. APCHING AND PASSING OVER PARKK (LOM); LOCATED AT 5.8 MI DME WE WERE CONFIGURING THE ACFT TO THE LNDG CONFIGN; UTILIZING THE WX RADAR TO CONFIRM CLRNC FROM WX AND MAINTAINING ATTN TO ACFT TFC AT BOEING FIELD (PARKK LOM) BOTH VISUALLY AND VIA TCASII. WE CONTINUED THE APCH TO LNDG AND DIDN'T REALIZE WE HAD NOT SWITCHED TO TWR FOR LNDG CLRNC UNTIL WE HAD TAXIED OFF RWY 16R AND WERE HOLDING SHORT OF RWY 16L. THIS PARTICULAR EVENT COULD BE CLASSIFIED AS A CASE OF BEING OVERLOADED IN A FAMILIAR SURROUNDING. THE MULTIPLE CLRNC WE RECEIVED WAS NOT UNUSUAL NOR WAS THE ACFT TFC LOCATED AT BOEING FIELD WHICH IS LOCATED AT THE PARKK (LOM) FOR THE ILS RWY 16R BUT IN THIS CASE COUPLED WITH THE WX IN THE AREA REQUIRING THE ATTN TO THE WX RADAR WE BECAME DISTRACTED. ALTHOUGH GIVING THE PIC TO CONTACT TWR AT SOME FUTURE POINT HELPS TO UNLOAD THE APCH CTLR IT DOES SET UP THE POSSIBILITY OF WHAT OCCURRED TO US. A MORE AUTHORITATIVE TYPE CLRNC SUCH AS 'CONTACT TWR' MIGHT REDUCE THE POSSIBILITY OF A FLC MISSING A REQUIREMENT TO SWITCH LIKE WE DID. IT MIGHT BE MORE APPROPRIATE FOR APCH CTL NOT TO TELL THE AIR CREW TO SWITCH FREQS UNTIL IT IS DESIRED. ALSO IN OUR SIT WE DID NOT RECEIVE A CALL FROM SEA APCH CTL REMINDING US TO SWITCH TO TWR ONCE WE WERE INSIDE PARKK (LOM) WHICH LED US TO WONDER AFTERWARDS HOW ARE THE TWR AND APCH ABLE TO TALK WITH EACH OTHER; OR WERE THEY OVERLOADED AS WELL. THIS IS NOT TO SAY THAT THEY DIDN'T TRY TO CONTACT US ON THE APCH FREQ BUT BOTH THE FO AND I DID NOT HEAR A CALL FROM THEM TO SWITCH TO TWR. SUPPLEMENTAL INFO FROM ACN 304739: CHKLISTS WERE DELAYED DUE TO WX AND TCASII TARGETS BUT WERE COMPLETED ON SHORT FINAL. AFTER LNDG ROLLOUT; I DISCOVERED I WAS STILL ON APCH FREQ. I THEN CALLED TWR BOTH FROM THE ACFT AND LATER ON THE LANDLINE. THE CTLR IN CHARGE SAID THERE WAS NO CONFLICT WITH ANY OTHER ACFT AND WE WERE MONITORED ON RADAR. THIS WAS ALSO A 10.5 HR CREW DAY (NOT COUNTING GET UP AND HOTEL ROUTINE); SO FATIGUE PLAYED A FACTOR.