Unauthorized runway entry by air carrier.

Attributes
ACN	192454
Time
Date	199110
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 10500 flight time type : 270
ASRS Report	192454
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 5900 flight time type : 1500
ASRS Report	191697
Events
Anomaly	incursion : runway
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Dfw tower cleared us into position to hold on runway 36R. Shortly thereafter tower changed his instructions and told us to taxi past 36R to runway 36L. Both myself and my first officer believed we had been cleared into position on 36L. We taxied onto 36L and were told we did not have clearance onto that runway. We taxied immediately off 36L. Supplemental information from acn 191697: while I was making my announcement and the captain getting in position we were issued another clearance to cross runway 36R to 36L. At that time we were both busy and we understood that we were cleared in position and hold on 36L so we did. Callback conversation with reporter revealed the following information: reporter participated in structured callback for runway incursion study. Does not know why dfw tower made last min runway assignment change, but as they were going into position on 36R they were very busy with takeoff preparations, and it is likely that they may have missed ATC instruction to hold short of 36L. When controller saw them enter runway 36L he said that they should not be on the runway so flight crew immediately taxied back off runway. Did not see or hear about any conflicting traffic. They later were instructed to use 36R (the original runway) for takeoff. Thinks that when last min changes are made by ATC they should emphasize the critical instructions.

Original NASA ASRS Text

Title: UNAUTHORIZED RWY ENTRY BY ACR.

Narrative: DFW TWR CLRED US INTO POS TO HOLD ON RWY 36R. SHORTLY THEREAFTER TWR CHANGED HIS INSTRUCTIONS AND TOLD US TO TAXI PAST 36R TO RWY 36L. BOTH MYSELF AND MY FO BELIEVED WE HAD BEEN CLRED INTO POS ON 36L. WE TAXIED ONTO 36L AND WERE TOLD WE DID NOT HAVE CLRNC ONTO THAT RWY. WE TAXIED IMMEDIATELY OFF 36L. SUPPLEMENTAL INFO FROM ACN 191697: WHILE I WAS MAKING MY ANNOUNCEMENT AND THE CAPT GETTING IN POS WE WERE ISSUED ANOTHER CLRNC TO CROSS RWY 36R TO 36L. AT THAT TIME WE WERE BOTH BUSY AND WE UNDERSTOOD THAT WE WERE CLRED IN POS AND HOLD ON 36L SO WE DID. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN STRUCTURED CALLBACK FOR RWY INCURSION STUDY. DOES NOT KNOW WHY DFW TWR MADE LAST MIN RWY ASSIGNMENT CHANGE, BUT AS THEY WERE GOING INTO POS ON 36R THEY WERE VERY BUSY WITH TKOF PREPARATIONS, AND IT IS LIKELY THAT THEY MAY HAVE MISSED ATC INSTRUCTION TO HOLD SHORT OF 36L. WHEN CTLR SAW THEM ENTER RWY 36L HE SAID THAT THEY SHOULD NOT BE ON THE RWY SO FLC IMMEDIATELY TAXIED BACK OFF RWY. DID NOT SEE OR HEAR ABOUT ANY CONFLICTING TFC. THEY LATER WERE INSTRUCTED TO USE 36R (THE ORIGINAL RWY) FOR TKOF. THINKS THAT WHEN LAST MIN CHANGES ARE MADE BY ATC THEY SHOULD EMPHASIZE THE CRITICAL INSTRUCTIONS.

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.