Air carrier widebody transport altitude deviation excursion from clearance altitude in response to T...

Attributes
ACN	195768
Time
Date	199111
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : arr
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent 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 : 220 flight time total : 16900 flight time type : 4400
ASRS Report	195768
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory 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:

Flight was level at assigned altitude of 11000 ft. When approach control informed us of known opposite direction traffic at 2 O'clock climbing to 10000 ft, which we then had in visual contact. Although the other aircraft was only climbing to 10000 ft, and we were still at 11000 ft it triggered a short duration climb advisory on our TCASII. Apparently because it (TCASII) anticipated that the other aircraft would continue its climb rather than leveling off at 10000 ft we initiated a climb based on TCASII as per company policy. The RA was very short and thus the deviation was only slight. Approach control was advised, we returned to normal flight path and continued with normal approach and landing. Comment: although the RA was apparently unnecessary and that there was no violation and no known actual conflict or other problem, am submitting this report for your information anyway.

Original NASA ASRS Text

Title: ACR WDB ALTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA.

Narrative: FLT WAS LEVEL AT ASSIGNED ALT OF 11000 FT. WHEN APCH CTL INFORMED US OF KNOWN OPPOSITE DIRECTION TFC AT 2 O'CLOCK CLBING TO 10000 FT, WHICH WE THEN HAD IN VISUAL CONTACT. ALTHOUGH THE OTHER ACFT WAS ONLY CLBING TO 10000 FT, AND WE WERE STILL AT 11000 FT IT TRIGGERED A SHORT DURATION CLB ADVISORY ON OUR TCASII. APPARENTLY BECAUSE IT (TCASII) ANTICIPATED THAT THE OTHER ACFT WOULD CONTINUE ITS CLB RATHER THAN LEVELING OFF AT 10000 FT WE INITIATED A CLB BASED ON TCASII AS PER COMPANY POLICY. THE RA WAS VERY SHORT AND THUS THE DEV WAS ONLY SLIGHT. APCH CTL WAS ADVISED, WE RETURNED TO NORMAL FLT PATH AND CONTINUED WITH NORMAL APCH AND LNDG. COMMENT: ALTHOUGH THE RA WAS APPARENTLY UNNECESSARY AND THAT THERE WAS NO VIOLATION AND NO KNOWN ACTUAL CONFLICT OR OTHER PROBLEM, AM SUBMITTING THIS RPT FOR YOUR INFO ANYWAY.

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 widebody transport altitude deviation excursion from clearance altitude in response to TCASII RA.