Altitude deviation.

Attributes
ACN	206593
Time
Date	199204
Day	Fri
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
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute : direct
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 : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500
ASRS Report	206593
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 other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While flying towards dfw on scy 296 degree radial at 11000 ft our TCASII displayed traffic at 11 O'clock 1800 ft below and climbing, a white diamond. Within seconds, the TCASII issued a yellow traffic, then within 2-3 seconds issued an RA of 'climb climb.' we had the aircraft visually after the 'traffic traffic' advisory. Shortly after the RA, I was about to lose sight of the intruding aircraft under the nose of our aircraft. I then directed my copilot to climb and follow the RA. We climbed to 11500. Just as we started climb, I advised ATC we were climbing in accordance with TCASII. ATC verified that our traffic had leveled at 10000 ft and we immediately returned to 11000 ft and slowed to 210 KTS.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: WHILE FLYING TOWARDS DFW ON SCY 296 DEG RADIAL AT 11000 FT OUR TCASII DISPLAYED TFC AT 11 O'CLOCK 1800 FT BELOW AND CLBING, A WHITE DIAMOND. WITHIN SECONDS, THE TCASII ISSUED A YELLOW TFC, THEN WITHIN 2-3 SECONDS ISSUED AN RA OF 'CLB CLB.' WE HAD THE ACFT VISUALLY AFTER THE 'TFC TFC' ADVISORY. SHORTLY AFTER THE RA, I WAS ABOUT TO LOSE SIGHT OF THE INTRUDING ACFT UNDER THE NOSE OF OUR ACFT. I THEN DIRECTED MY COPLT TO CLB AND FOLLOW THE RA. WE CLBED TO 11500. JUST AS WE STARTED CLB, I ADVISED ATC WE WERE CLBING IN ACCORDANCE WITH TCASII. ATC VERIFIED THAT OUR TFC HAD LEVELED AT 10000 FT AND WE IMMEDIATELY RETURNED TO 11000 FT AND SLOWED TO 210 KTS.

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.