Narrative:

Captain was flying his first trip out of miami. I had been in miami approximately 3 months. Captain got clearance from ground control to taxi to runway 27L. I didn't hear taxi instructions as I was busy with company on the other frequency figuring weight and balance. Captain taxied south on taxiway Y. As he approached runway 30, I asked him if we were 'cleared to cross.' he said we were and taxied across. Runways in use were runway 27L, 27R and runway 39. After we crossed runway 30, the ground controller asked us where we were. Captain replied 'just crossed runway 30.' the controller then told us to 'hold short of runway 30.' contributing factors were: 1) captain's unfamiliarity with miami airport. 2) my being busy with company, and not being able to show him the correct taxi route. (I had never taxied to runway 27L by crossing runway 30 before, so it felt strange.) 3) mia has the most poorly labeled txwys and runways of any air carrier airport I have operated out of. To correct the problem: 1) captain should have held the taxi out until I was completed with my paper work so I could assist him. 2) signs and markings at mia could be improved. Callback conversation with reporter revealed the following information: the reporter is a first officer flying the ATR-42 and - 72 for a regional air carrier. He was called on a special study. He was unable to add anything to his statement.

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Original NASA ASRS Text

Title: RWY INCURSION WHILE TAXIING OUT FOR TKOF.

Narrative: CAPT WAS FLYING HIS FIRST TRIP OUT OF MIAMI. I HAD BEEN IN MIAMI APPROX 3 MONTHS. CAPT GOT CLRNC FROM GND CTL TO TAXI TO RWY 27L. I DIDN'T HEAR TAXI INSTRUCTIONS AS I WAS BUSY WITH COMPANY ON THE OTHER FREQ FIGURING WT AND BAL. CAPT TAXIED S ON TXWY Y. AS HE APCHED RWY 30, I ASKED HIM IF WE WERE 'CLRED TO CROSS.' HE SAID WE WERE AND TAXIED ACROSS. RWYS IN USE WERE RWY 27L, 27R AND RWY 39. AFTER WE CROSSED RWY 30, THE GND CTLR ASKED US WHERE WE WERE. CAPT REPLIED 'JUST CROSSED RWY 30.' THE CTLR THEN TOLD US TO 'HOLD SHORT OF RWY 30.' CONTRIBUTING FACTORS WERE: 1) CAPT'S UNFAMILIARITY WITH MIAMI ARPT. 2) MY BEING BUSY WITH COMPANY, AND NOT BEING ABLE TO SHOW HIM THE CORRECT TAXI RTE. (I HAD NEVER TAXIED TO RWY 27L BY XING RWY 30 BEFORE, SO IT FELT STRANGE.) 3) MIA HAS THE MOST POORLY LABELED TXWYS AND RWYS OF ANY ACR ARPT I HAVE OPERATED OUT OF. TO CORRECT THE PROB: 1) CAPT SHOULD HAVE HELD THE TAXI OUT UNTIL I WAS COMPLETED WITH MY PAPER WORK SO I COULD ASSIST HIM. 2) SIGNS AND MARKINGS AT MIA COULD BE IMPROVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS A FO FLYING THE ATR-42 AND - 72 FOR A REGIONAL ACR. HE WAS CALLED ON A SPECIAL STUDY. HE WAS UNABLE TO ADD ANYTHING TO HIS STATEMENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.