B737-300 FLC PERFORMS AN UNAUTH LNDG AT ORD. CLRNC LNDG NOT RECEIVED. ONCE ON TWR FREQ CLRING RWY THEY FAIL TO CONTACT GND CTL AT REQUIRED HOLDING POINT. 2 CASES OF NON ADHERENCE TO ATC CLRNC INSTRUCTION.

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DURING THE APCH TO RWY 22R AT ORD APCH CTL ASKED US TO MAINTAIN 250 KTS TO NOLEN AND CLRED US FOR THE APCH. INSIDE NOLEN ATC REQUESTED 210 KTS OR BETTER AND CONTACT TWR AT RIDGE. THEN ATC REQUESTED WE MAINTAIN 190 KTS OR GREATER. DUE TO THE GREATER THAN NORMAL AIRSPD AT RIDGE; I WAS CONCENTRATING ON CONFIGURING THE ACFT FOR LNDG. WE FORGOT TO SWITCH TO TWR; AND LANDED WITHOUT CLRNC. SOMETHING I WOULD LIKE TO SEE US DO THAT THEY ALREADY DO IN CANADA IS FOR APCH CTL TO HAND YOU OFF TO TWR WHEN HE IS FINISHED WITH YOU. IN THIS SIT WE WERE GIVEN 3 AIRSPD CHANGES AFTER WE WERE TOLD TO CHANGE FREQS. I THINK THIS CONTRIBUTED TO US FORGETTING TO SWITCH. ALSO; I WOULD LIKE TO SEE THE TWR ONLY ISSUE LNDG CLRNC WHEN #1 FOR THE RWY; NOT '#4 CLRED TO LAND.' SUPPLEMENTAL INFO FROM ACN 354813: THE ACFT MUST BE HANDLED IN A SPECIFIC WAY IN ORDER TO MAINTAIN THE GS AND BE STABILIZED AND CONFIGURED CORRECTLY. BECAUSE OF THIS; MY ATTN WAS DISTR FROM MY PNF DUTIES; AND I WAS TOO ENGROSSED IN MONITORING THE CAPT. WE PROCEEDED ON THE APCH. RIDGE CAME AND PASSED; AND WE DID NOT CONTACT THE TWR. OUR CARRIER HAS A STANDARD CALLOUT AT 1000 FT AGL: PNF '1000 FT; INSTS ARE XCHKED.' PF: 'RWY XX; CLRED TO LAND.' THIS CALLOUT OCCURRED INSIDE OF RIDGE; AND THE CAPT FALSELY CONFIRMED WITH HIS STATEMENT 'RWY 22R CLRED TO LAND' THAT WE WERE CLRED TO LAND ON RWY 22R. WE HADN'T EVEN SWITCHED TO TWR SO OBVIOUSLY WE WEREN'T CLRED TO LAND. BOTH OF US MISSED THIS FALSE CALLOUT. I FORGOT MY PNF DUTIES AT RIDGE TO CALL TWR AND THE CAPT MISSED HIS PF DUTY OF CONFIRMING THAT WE HAD BEEN CLRED TO LAND. WE LANDED WITHOUT A CLRNC AND PULLED OFF OF RWY 22R; SHORT OF RWY 27R AT TXWY C. AT THIS POINT I FOUND IT STRANGE THAT WE HADN'T BEEN GIVEN MORE INSTRUCTIONS BY TWR. THIS IS WHEN I REALIZED WE WEREN'T ON TWR FREQ. I IMMEDIATELY TRIED TO CONTACT TWR ON N COMPLEX FREQ 126.9 -- NO ANSWER. THEN ON S COMPLEX FREQ 120.75 HE SAID GO TO 127.92. WHEN WE FINALLY MADE CONTACT; THE TWR SAID 'CLRED TO LAND ON RWY 22R; CROSS RWY 27R; MAKE A R TURN ON TXWY B; CONTACT GND WHEN CLR OF RWY 27R.' THIS WAS AN APPARENT 'WE'LL LET YOU GO THIS TIME' BY TWR. HE HAD CLRED US TO LAND ON RWY 22R WHEN WE WERE ALREADY ON THE GND SHORT OF RWY 27R. THE NEXT PROB OCCURRED WHEN WE MADE A R TURN ON TXWY B AND GND WAS NEVER CONTACTED AND WE CONTINUED TO TAXI VIA TXWY B TO OUR GATE. I HAD BEEN TOO BUSY WITH MY PNF DUTIES AFTER LNDG -- CONTACTING RAMP CTL AND RECONFIGURING THE ACFT. BUT MOST OF ALL; I WAS VERY DISTURBED BY THE LNDG WITHOUT A CLRNC. IT SEEMS SO WAS THE CAPT BECAUSE NOT FOR ANOTHER APPROX 30 SECONDS DID WE FINALLY GO TO GND CTL. WHEN I CHKED IN WITH GND; HE WAS CURIOUS WHY WE HADN'T CHKED IN EARLIER; AS WE WERE SUPPOSED TO HAVE HELD SHORT OF A TXWY FOR A B727 TO PASS. HE THEN CLRED US TO THE GATE. CONTRIBUTING FACTORS: BOTH THE CAPT AND I WERE ON OUR FIRST TRIP FOR A WHILE. I WAS COMING OFF OF 5 WKS OFF WITH A BROKEN ANKLE; AND THE CAPT 2 1/2 WKS FROM VACATION. WE BOTH WERE A LITTLE RUSTY. WE SHOULDN'T HAVE ACCEPTED THE 3 SPDS FROM APCH -- SHOULD HAVE SLOWED UP MUCH EARLIER. WE LET APCH CTL FLY OUR AIRPLANE AND WE GOT BEHIND THE ACFT. AS FAR AS THE TAXI-IN INCIDENT; BOTH THE CAPT AND I WERE SO FRAZZLED AND DISTURBED BECAUSE OF OUR PREVIOUS MISTAKE THAT IT AFFECTED OUR DUTIES AT HAND. I TAKE MY JOB VERY SERIOUSLY AS MOST PLTS DO; AND THE LNDG WITHOUT A CLRNC REALLY BOTHERED ME. I HAD NEVER DONE ANYTHING LIKE THIS BEFORE. I REALIZE IN RETROSPECT THAT IF SOMETHING LIKE THIS HAPPENS; IT IS VERY IMPORTANT TO 'BREAK' THE CHAIN OF EVENTS AND CONTINUE TO OPERATE THE ACFT SAFELY. WORRY ABOUT THE DEV AT THE GATE; NOT WHEN YOUR FULL UNDIVIDED ATTN IS NEEDED WHEN OPERATING AN ACFT.