Air carrier medium large transport altitude deviation excursion from clearance altitude in response ...

Attributes
ACN	169887
Time
Date	199102
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : hln
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other landing other
Route In Use	approach : visual arrival star : star
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other landing other
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 7000 flight time type : 1250
ASRS Report	169887
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe
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
Consequence	Other
Miss Distance	horizontal : 4000 vertical : 500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were cleared to proceed inbound on the 31R localizer at dfw for a stadium visibility approach to 31R. We were cleared to maintain 3000' and were doing it when our TCAS ii gave us a TA, followed by an RA telling us to 'climb' at 2000 FPM. It showed the traffic at 12 O'clock level at our altitude. We climbed to 3500', got a 'clear of traffic' advisory from TCAS ii and then returned to 3000', advising approach control what we were doing. We did this altitude deviation in accordance with TCAS ii procedures and never saw the traffic that approach advised us was VFR at 2500' after we had made our deviation.

Original NASA ASRS Text

Title: ACR MLG ALT DEVIATION EXCURSION FROM CLRNC ALT IN RESPONSE TO TCAS II RA.

Narrative: WE WERE CLRED TO PROCEED INBND ON THE 31R LOC AT DFW FOR A STADIUM VIS APCH TO 31R. WE WERE CLRED TO MAINTAIN 3000' AND WERE DOING IT WHEN OUR TCAS II GAVE US A TA, FOLLOWED BY AN RA TELLING US TO 'CLB' AT 2000 FPM. IT SHOWED THE TFC AT 12 O'CLOCK LEVEL AT OUR ALT. WE CLBED TO 3500', GOT A 'CLR OF TFC' ADVISORY FROM TCAS II AND THEN RETURNED TO 3000', ADVISING APCH CTL WHAT WE WERE DOING. WE DID THIS ALT DEVIATION IN ACCORDANCE WITH TCAS II PROCS AND NEVER SAW THE TFC THAT APCH ADVISED US WAS VFR AT 2500' AFTER WE HAD MADE OUR DEVIATION.

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.

Air carrier medium large transport altitude deviation excursion from clearance altitude in response to TCAS ii RA.