RWY INCURSION; FLC TOOK THE RWY WITHOUT CLRNC.

Narrative

PREFLT WAS UNEVENTFUL AND CARGO LOADING WAS ON TIME. THE CAPT; 55 YRS OLD; BEGAN TO COMPLAIN ABOUT THE IRUS NOT ALIGNING RIGHT. THIS WAS OUR LAST FLT OF THE MONTH TOGETHER FOR MAY AND HE GENERALLY COMPLAINED ABOUT SOMETHING IN EACH OF OUR PREVIOUS FLTS. I HAVE HAD SEVERAL HRS OF COCKPIT RESOURCE MGMNT TRAINING AND FELT COMFORTABLE ASSERTING PROFESSIONAL REMARKS/ADVICE WHEN NEEDED. MY MOTTO IS 'WHEN IN DOUBT; SHOUT.' THE CAPT; PRIOR TO MAY'S SCHEDULE; HAD BEEN OFF FOR 3.5 MONTHS FOR SOME MEDICAL CARE. I HAVE BEEN IN THIS TYPE ACFT FOR 10 FULL MONTHS. WE HAD CLRNC TO PUSH BACK FROM ACR RAMP/TWR. WE TAXIED TO OUR EXIT POINT WHERE WE CONTACTED MEM GND. ALL APPROPRIATE CHKLISTS WERE CALLED FOR AND COMPLETED UP TO THE FINAL PORTION OF THE TKOF CHKLIST. IT WAS MY LEG TO FLY FROM MEM-ONT. NORMALLY RWY 27 IS NOT ALWAYS AVAILABLE AND WE USE RWY 18R. I ASKED GND CTL IF WE COULD EXPECT RWY 27; AND THE REPLY WAS 'YES; TAXI TO RWY 27; I HAVE AN ACFT ON FINAL FOR RWY 18L.' SINCE IT WAS MY LEG; I LOOKED DOWN TO SEE IF THE FMS; FLAP; DEP FREQ; XPONDER CODE WERE RIGHT. WHEN I LOOKED UP; THE CAPT HAD ALREADY BEGUN TO TAKE RWY 27. I TOLD HIM I DON'T BELIEVE WE HAVE CLRNC TO POS AND HOLD. I IMMEDIATELY CALLED TWR AND THEY REPLIED WE WERE NOT GIVEN POS AND HOLD. AT THIS POINT; NOT SURE MYSELF; I SAID I THOUGHT WE WERE. UPSET AT WHAT HAPPENED; I COLLECTED MYSELF TO ENSURE ALL CHKLISTS WERE IN FACT COMPLETED. WE WERE THEN GIVEN CLRNC TO TKOF. I KNOW NOW NOT TO GET SO INVOLVED WITH THE FMS UNTIL ARRIVING AT THE NEXT HOLD SHORT POINT. ONCE AIRBORNE; I ADMINISTERED SOME COCKPIT RESOURCE MGMNT AND ASKED IF HE THOUGHT WE MIGHT GET A VIOLATION. HE SAID NO; 'BECAUSE OTHER PLTS HAVE DONE WORSE AND NEVER RECEIVED ONE.' I PERSONALLY FIND THAT NOT TRUE. MEM CTLRS HAVE ALWAYS BEEN PROFESSIONAL AND; YES WE ALL MAKE MISTAKES. I FEEL MY ACR HAS A GREAT RAPPORT WITH MEM AND THE ENTIRE INDUSTRY. WHAT I DON'T LIKE IS THE CAPT'S ATTITUDE. NO; I AM NOT RPTING THIS BECAUSE OF HIM; I AM JUST AS RESPONSIBLE AND FEEL BAD I ALLOWED HIM TO TAKE THE RWY. I STILL REMEMBER THE ACCIDENT IN LAX. I HAVE RPTED THIS TO MY FLT MGR AND SAFETY DEPT.