Altitude deviation altitude excursion occurs after air carrier medium large transport receives a TCASII RA on opposite direction climbing departure traffic.

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Attributes
ACN	182088
Time
Date	199106
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : scy
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other cruise other
Route In Use	arrival other arrival star : star enroute airway : dfw
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7000
ASRS Report	182088
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 : 16600 flight time type : 1610
ASRS Report	182302
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Approaching dfw on scurry 1 arrival on scy 296 degree right, 32 mi outbnd received call from approach control re: traffic at 10 O'clock, several mi away, climbing to 10000'. We responded that we were looking for traffic. We then got a TA on our TCAS, which several seconds later, went to an right/a. This required us to climb (we climbed to approximately 11500' which we did, until TCAS issued 'clear of traffic.' then we promptly returned to the assigned altitude of 11000'. Approach control was notified. Supplemental information from acn 182302: while responding to climb RA I told first officer to advise ATC we were climbing to a climb RA. We were then cleared to 120000' and advised the traffic was level at 10000'. We were asked why we were climbing and again we advised ATC because of a climb RA. TCAS then issued a clear of conflict. Were then reclred 11000' to which we complied. No further incident. My personal feeling is the other aircraft climb rate was interpreted by TCAS and projected to a be a conflict when in reality because the other aircraft did level at 10000' was really no conflict at all.

Original NASA ASRS Text

Title: ALT DEVIATION ALT EXCURSION OCCURS AFTER ACR MLG RECEIVES A TCASII RA ON OPPOSITE DIRECTION CLIMBING DEP TRAFFIC.

Narrative: APCHING DFW ON SCURRY 1 ARR ON SCY 296 DEG R, 32 MI OUTBND RECEIVED CALL FROM APCH CTL RE: TFC AT 10 O'CLOCK, SEVERAL MI AWAY, CLBING TO 10000'. WE RESPONDED THAT WE WERE LOOKING FOR TFC. WE THEN GOT A TA ON OUR TCAS, WHICH SEVERAL SECS LATER, WENT TO AN R/A. THIS REQUIRED US TO CLB (WE CLBED TO APPROX 11500' WHICH WE DID, UNTIL TCAS ISSUED 'CLR OF TFC.' THEN WE PROMPTLY RETURNED TO THE ASSIGNED ALT OF 11000'. APCH CTL WAS NOTIFIED. SUPPLEMENTAL INFO FROM ACN 182302: WHILE RESPONDING TO CLB RA I TOLD F/O TO ADVISE ATC WE WERE CLBING TO A CLB RA. WE WERE THEN CLRED TO 120000' AND ADVISED THE TFC WAS LEVEL AT 10000'. WE WERE ASKED WHY WE WERE CLBING AND AGAIN WE ADVISED ATC BECAUSE OF A CLB RA. TCAS THEN ISSUED A CLR OF CONFLICT. WERE THEN RECLRED 11000' TO WHICH WE COMPLIED. NO FURTHER INCIDENT. MY PERSONAL FEELING IS THE OTHER ACFT CLB RATE WAS INTERPRETED BY TCAS AND PROJECTED TO A BE A CONFLICT WHEN IN REALITY BECAUSE THE OTHER ACFT DID LEVEL AT 10000' WAS REALLY NO CONFLICT AT ALL.

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.