IFR DEP FROM DTW EXPERIENCED CONFUSION WITH ATC CLRNC AND IS DIRECTED TO EXIT RWY.

Narrative

WE WERE GIVEN AN XA53 LCL WHEELS UP TIME FOR DEP. WE WERE SITTING #1 AT RWY 3L/TXWY M INTXN AT XA52 LCL. AT THIS TIME THERE WAS A RADIO XMISSION FROM TWR WHICH ALL I HEARD WAS 'POS AND HOLD RWY 3L.' I DID NOT RESPOND TO THIS CALL. THE CAPT SAID; 'THAT WAS FOR US.' I THEN RESPONDED; 'ACR X POS AND HOLD.' I CANNOT REMEMBER IF I INCLUDED RWY 3L IN THE XMISSION. WE CHKED FINAL AND SAW THERE WAS AN ACFT ON FINAL AT AN EXTENDED DISTANCE; (NORMAL SPACING FOR A TKOF). THE CAPT TAXIED INTO POS AND WAS HOLDING WHILE I FINISHED THE BEFORE TKOF CHKLISTS. AFTER A FEW SECONDS SITTING ON THE RWY; (WHICH I REMEMBER AS A FEW SECONDS); THE TWR TOLD US TO EXIT THE RWY; R TURN TO CLR AT TXWY PP1. DURING THE INITIAL CLRING OF THE TXWY; TWR SAID WE HAD A NEW EFC TIME OF XA58 LCL. WHEN WE WERE MAKING THE 180 DEG TURN AT PP1 TWR THEN CAME BACK AND SAID; 'CALL US WHEN YOU GET TO YOUR DEST AT TELEPHONE NUMBER XXX (DTW TWR NUMBER) FOR A POSSIBLE PLTDEV VIOLATION.' NEEDLESS TO SAY THE LEG BACK TO ZZZ WAS NOT A HAPPY ONE. WHEN WE LANDED AT ZZZ; THE CAPT CALLED DTW TWR. THEY HAD LISTENED TO THE TAPES WITH THE FOLLOWING RESULTS. THE TWR CTLR HAD CLRED THE ACFT ON FINAL TO LAND RWY 3L; BUT IN THE SAME XMISSION ALSO CLRED HIM TO TAXI INTO POS AND HOLD RWY 3L. SOMETHING TO THE EFFECT; 'ACR Y CLRED TO LAND RWY 3L; TAXI INTO POS AND HOLD RWY 3L.' THE CAPT HAD HEARD THIS TAXI INTO POS AND HOLD RWY 3L AND SINCE I DID NOT RESPOND TO THIS CALL; THAT'S WHY HE SAID 'THAT WAS FOR US.' WHEN I READ BACK THE POS AND HOLD CALL; THE CTLR DID NOT RESPOND IMMEDIATELY TO US BECAUSE HE MAY HAVE THOUGHT HE HAD CLRED US INTO POS AND HOLD. WITHIN A FEW SECONDS THE ERROR WAS DISCOVERED AND WE WERE INSTRUCTED TO CLR THE RWY WITH THE ACFT ON FINAL; LNDG UNEVENTFUL. THE TWR SAID NO FURTHER PLTDEV/VIOLATION WOULD BE TAKEN SINCE TWR HAD MADE THE INITIAL ERROR WITHOUT CORRECTING IT. WE; AS THE PLTS; ALSO COMPOUNDED THIS ERROR. WE COULD HAVE ALSO CORRECTED IT. LESSONS LEARNED: (WHICH I ALREADY KNEW; BUT DID NOT FOLLOW). 1) BE SURE BOTH PLTS FULLY UNDERSTAND THE RADIO XMISSIONS. IF BOTH PLTS ARE NOT 100% CLR AND SURE OF THE CONTENT THEN ASK THE CTLR AGAIN. 2) THIS WAS ALSO A GREAT SET UP. WE WERE SITTING #1 WITH 1 MIN TO GO FOR OUR DEP TIME AND HEARD POS AND HOLD. BE SURE THE RADIO XMISSION IS FOR YOU. HEAR WHAT IS ACTUALLY SAID AND NOT WHAT YOU WANT TO HEAR TO FULFILL YOUR EXPECTATIONS.