An medium large transport air carrier crew had a TCASII alert in the traffic pattern with an small transport that had been lost visually in the haze. Both aircraft landed safely on parallel runways after a new clearance was issued.

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Attributes
ACN	210151
Time
Date	199205
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 3500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other landing other
Route In Use	approach : visual arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach descent other landing other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 290 flight time total : 11000
ASRS Report	210151
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Having been cleared to follow an small transport on final, I slowed to 170 IAS. The TCASII gave us a TA along with loss of sight on the small transport who we were cleared to follow for a visual to 17L. Small transport descended into haze. We were instructed to square the final for interval. Our turn extended west of the final course, incurring an RA to climb. RA followed and a correction back to final executed. Our 170 speed never changed. However, the small transport slowed and when resighted, was low and approximately 1 1/2 NM ahead. Tower cleared the small transport to land 17R and we continued 17L. Contributing facts: loss of visual sight due to a haze layer at 3000 ft. Square turn to final interrupted by TCASII TA. Resulting RA to follow and correct appropriate action by crew was completed. When we broke below the haze layer, we were right of final and correcting back. Aircraft separation of 1 1/2 due to the small transport slowing to final approach speed early. Heavy aircraft loading with combined loss of visual contact with visual traffic to 17L. TCASII TA contributing factors.

Original NASA ASRS Text

Title: AN MLG ACR CREW HAD A TCASII ALERT IN THE TFC PATTERN WITH AN SMT THAT HAD BEEN LOST VISUALLY IN THE HAZE. BOTH ACFT LANDED SAFELY ON PARALLEL RWYS AFTER A NEW CLRNC WAS ISSUED.

Narrative: HAVING BEEN CLRED TO FOLLOW AN SMT ON FINAL, I SLOWED TO 170 IAS. THE TCASII GAVE US A TA ALONG WITH LOSS OF SIGHT ON THE SMT WHO WE WERE CLRED TO FOLLOW FOR A VISUAL TO 17L. SMT DSNDED INTO HAZE. WE WERE INSTRUCTED TO SQUARE THE FINAL FOR INTERVAL. OUR TURN EXTENDED W OF THE FINAL COURSE, INCURRING AN RA TO CLB. RA FOLLOWED AND A CORRECTION BACK TO FINAL EXECUTED. OUR 170 SPD NEVER CHANGED. HOWEVER, THE SMT SLOWED AND WHEN RESIGHTED, WAS LOW AND APPROX 1 1/2 NM AHEAD. TWR CLRED THE SMT TO LAND 17R AND WE CONTINUED 17L. CONTRIBUTING FACTS: LOSS OF VISUAL SIGHT DUE TO A HAZE LAYER AT 3000 FT. SQUARE TURN TO FINAL INTERRUPTED BY TCASII TA. RESULTING RA TO FOLLOW AND CORRECT APPROPRIATE ACTION BY CREW WAS COMPLETED. WHEN WE BROKE BELOW THE HAZE LAYER, WE WERE R OF FINAL AND CORRECTING BACK. ACFT SEPARATION OF 1 1/2 DUE TO THE SMT SLOWING TO FINAL APCH SPD EARLY. HVY ACFT LOADING WITH COMBINED LOSS OF VISUAL CONTACT WITH VISUAL TFC TO 17L. TCASII TA CONTRIBUTING FACTORS.

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.