Narrative:

Air carrier X, iah to dfw. Dfw landing south. 1) X vectored into approximately 8-10 mi final to runway 18R, handed over to dfw tower. (Approach had told us to maintain 170 KIAS until marker.) 2) turn advised us of WX (heavy thunderstorm) moving across field, south to north, rain was about halfway down runway moving north, we had been cleared to land. 3) tower then advised us an air carrier Y, 757 had been turned in front of us for the same runway. 4) the TCASII showed the 757 to be 2 1/2 to 3 mi in front of us. I got a visual on the 757, it was about 3 mi ahead. 5) I requested runway 18L and was cleared to land on runway 18L. The 757 continued for runway 18R. 6) the 'wall of rain' had moved to about the 1000 ft marker on both runways. The landing was uneventful (visibility was lost on the rollout due to heavy rain). Dfw controllers - it is common knowledge, give preferential treatment to air carrier. This preferential treatment compromised the safety of my flight by placing a B-757 2 1/2 mi in front of my aircraft while conducting an approach into rapidly deteriorating WX conditions. If runway 18L had not been available, or if the incident had happened a min or 2 later, I would have had to consider going around, into adverse WX, to avoid the wake turbulence associated with B-757 operations. FAA directs controllers to provide a minimum of 4 mi separation from B-757 aircraft. This was not done.

Related reports:

Google
 

Original NASA ASRS Text

Title: ACR X HAD LTSS FROM B757 ON APCH. SYS ERROR.

Narrative: ACR X, IAH TO DFW. DFW LNDG S. 1) X VECTORED INTO APPROX 8-10 MI FINAL TO RWY 18R, HANDED OVER TO DFW TWR. (APCH HAD TOLD US TO MAINTAIN 170 KIAS UNTIL MARKER.) 2) TURN ADVISED US OF WX (HVY TSTM) MOVING ACROSS FIELD, S TO N, RAIN WAS ABOUT HALFWAY DOWN RWY MOVING N, WE HAD BEEN CLRED TO LAND. 3) TWR THEN ADVISED US AN ACR Y, 757 HAD BEEN TURNED IN FRONT OF US FOR THE SAME RWY. 4) THE TCASII SHOWED THE 757 TO BE 2 1/2 TO 3 MI IN FRONT OF US. I GOT A VISUAL ON THE 757, IT WAS ABOUT 3 MI AHEAD. 5) I REQUESTED RWY 18L AND WAS CLRED TO LAND ON RWY 18L. THE 757 CONTINUED FOR RWY 18R. 6) THE 'WALL OF RAIN' HAD MOVED TO ABOUT THE 1000 FT MARKER ON BOTH RWYS. THE LNDG WAS UNEVENTFUL (VISIBILITY WAS LOST ON THE ROLLOUT DUE TO HVY RAIN). DFW CTLRS - IT IS COMMON KNOWLEDGE, GIVE PREFERENTIAL TREATMENT TO ACR. THIS PREFERENTIAL TREATMENT COMPROMISED THE SAFETY OF MY FLT BY PLACING A B-757 2 1/2 MI IN FRONT OF MY ACFT WHILE CONDUCTING AN APCH INTO RAPIDLY DETERIORATING WX CONDITIONS. IF RWY 18L HAD NOT BEEN AVAILABLE, OR IF THE INCIDENT HAD HAPPENED A MIN OR 2 LATER, I WOULD HAVE HAD TO CONSIDER GOING AROUND, INTO ADVERSE WX, TO AVOID THE WAKE TURB ASSOCIATED WITH B-757 OPS. FAA DIRECTS CTLRS TO PROVIDE A MINIMUM OF 4 MI SEPARATION FROM B-757 ACFT. THIS WAS NOT DONE.

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.