An air carrier medium large transport responded to a TCASII climb command in the traffic pattern at ...

Attributes
ACN	222482
Time
Date	199209
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : pub
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2500 flight time type : 600
ASRS Report	222482
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 8000 flight time type : 2500
ASRS Report	221902
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Miss Distance	horizontal : 1500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Vectors to final approach during heavy traffic left us too tight (2 NM) on an medium large transport inbound to 17L at dfw. To help the situation, we suggested to approach that we be allowed to maneuver away from our traffic in order to attain better separation. The controller authorized this as long as we would limit our altitude to no less than 4000 MSL. While maneuvering the vectors we were given drove us through the final approach for 17L. Meanwhile, a commuter aircraft on a different tower frequency was reassigned from runway 18 over to 17R. TCASII on our aircraft alerted us to this situation and demanded that we climb. As I did not have visual on this unexpected traffic, I initiated a climbing left turn back to our final using approximately 40 degree of bank. At no time did I observe our altitude to be below 4000 ft. Landing from this position uneventful.

Original NASA ASRS Text

Title: AN ACR MLG RESPONDED TO A TCASII CLB COMMAND IN THE TFC PATTERN AT DFW.

Narrative: VECTORS TO FINAL APCH DURING HVY TFC LEFT US TOO TIGHT (2 NM) ON AN MLG INBOUND TO 17L AT DFW. TO HELP THE SITUATION, WE SUGGESTED TO APCH THAT WE BE ALLOWED TO MANEUVER AWAY FROM OUR TFC IN ORDER TO ATTAIN BETTER SEPARATION. THE CTLR AUTHORIZED THIS AS LONG AS WE WOULD LIMIT OUR ALT TO NO LESS THAN 4000 MSL. WHILE MANEUVERING THE VECTORS WE WERE GIVEN DROVE US THROUGH THE FINAL APCH FOR 17L. MEANWHILE, A COMMUTER ACFT ON A DIFFERENT TWR FREQ WAS REASSIGNED FROM RWY 18 OVER TO 17R. TCASII ON OUR ACFT ALERTED US TO THIS SITUATION AND DEMANDED THAT WE CLB. AS I DID NOT HAVE VISUAL ON THIS UNEXPECTED TFC, I INITIATED A CLBING L TURN BACK TO OUR FINAL USING APPROX 40 DEG OF BANK. AT NO TIME DID I OBSERVE OUR ALT TO BE BELOW 4000 FT. LNDG FROM THIS POS UNEVENTFUL.

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.

An air carrier medium large transport responded to a TCASII climb command in the traffic pattern at dfw.