Commuter light transport unauthorized runway entry.

Attributes
ACN	160810
Time
Date	199010
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 3700 flight time type : 130
ASRS Report	160891
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

This event occurred when mia tower instructed us to taxi into position and hold runway 12. However our call sign was blocked by another aircraft. Since we were first in line I assumed it was for us and we proceeded to taxi to runway 12. My first officer also read back the instructions to mia tower. Before we were on runway 12 the tower called again an told us to taxi to runway 9L. We responded and stated that we were instructed to taxi to runway 12. The tower replied and said that instruction was for the aircraft behind us. This particular event was not dangerous because we were not on the runway, however we very well could have been. I see the problem areas in this event. One is that it is very important for ATC to listen to readbacks. Had ATC listened to my first officer's readback this would have been prevented. The second problem is for pilots not to assume anything, like I did, in this particular case.

Original NASA ASRS Text

Title: COMMUTER LTT UNAUTH RWY ENTRY.

Narrative: THIS EVENT OCCURRED WHEN MIA TWR INSTRUCTED US TO TAXI INTO POS AND HOLD RWY 12. HOWEVER OUR CALL SIGN WAS BLOCKED BY ANOTHER ACFT. SINCE WE WERE FIRST IN LINE I ASSUMED IT WAS FOR US AND WE PROCEEDED TO TAXI TO RWY 12. MY F/O ALSO READ BACK THE INSTRUCTIONS TO MIA TWR. BEFORE WE WERE ON RWY 12 THE TWR CALLED AGAIN AN TOLD US TO TAXI TO RWY 9L. WE RESPONDED AND STATED THAT WE WERE INSTRUCTED TO TAXI TO RWY 12. THE TWR REPLIED AND SAID THAT INSTRUCTION WAS FOR THE ACFT BEHIND US. THIS PARTICULAR EVENT WAS NOT DANGEROUS BECAUSE WE WERE NOT ON THE RWY, HOWEVER WE VERY WELL COULD HAVE BEEN. I SEE THE PROB AREAS IN THIS EVENT. ONE IS THAT IT IS VERY IMPORTANT FOR ATC TO LISTEN TO READBACKS. HAD ATC LISTENED TO MY F/O'S READBACK THIS WOULD HAVE BEEN PREVENTED. THE SECOND PROB IS FOR PLTS NOT TO ASSUME ANYTHING, LIKE I DID, IN THIS PARTICULAR CASE.

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.