An air carrier first officer reported that while he made FMC takeoff runway changes the captain incu...

Attributes
ACN	889659
Time
Date	201005
Local Time Of Day	1201-1800
Place
Locale Reference	MIA.Airport
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	Other taxi
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer
Experience	Flight Crew Total 19000
Events
Anomaly	Deviation - Procedural Clearance Ground Event / Encounter Other / Unknown Ground Incursion Runway

Narrative:

We were told to taxi to runway 12 in mia. We had planned on a 8L departure. After clearance was received from ground we re briefed a 12 via P taxi. When we were both clear of the instructions. We started our taxi on taxiway P. The captain stated he had taxi under control down P to 12. I then diverted my attention to the aircraft to changed the box to match 12 not 8L. I was heads down the captain drove aircraft onto runway 12 intersection south. Before I realized the situation; it was too late. We crossed onto an active runway. The captain stated a lack of proper signs in that area led to the mistake. I have been to that area of the airport and no one has ever made the mistake to veer off taxiway P. That is why I was changing the box early to be more heads up later in the taxi. Better signs in that area and never losing track of your position are the best solutions to this event.

Original NASA ASRS Text

Title: An Air Carrier First Officer reported that while he made FMC takeoff runway changes the Captain incurred MIA Runway 12/30 after being cleared to Runway 12 on Taxiway P.

Narrative: We were told to taxi to runway 12 in MIA. We had planned on a 8L departure. After clearance was received from ground we re briefed a 12 via P taxi. When we were both clear of the instructions. We started our taxi on taxiway P. The Captain stated he had taxi under control down P to 12. I then diverted my attention to the aircraft to changed the box to match 12 not 8L. I was heads down the Captain drove Aircraft onto runway 12 intersection S. Before I realized the situation; it was too late. We crossed onto an active runway. The Captain stated a lack of proper signs in that area led to the mistake. I have been to that area of the airport and no one has ever made the mistake to veer off taxiway P. That is why I was changing the box early to be more heads up later in the taxi. Better signs in that area and never losing track of your position are the best solutions to this event.

Data retrieved from NASA's ASRS site as of April 2012 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.

An air carrier first officer reported that while he made FMC takeoff runway changes the captain incurred mia runway 12/30 after being cleared to runway 12 on taxiway P.