<< >> NASA ASRS Report 192280, October 1991

Flight crew of large transport at 11000 ft on approach to dfw had TCASII RA. Climbed 300 ft to clear. Traffic not sighted had leveled 1000 ft below.

Attributes
ACN	192280
Time
Date	199110
Day	Sat
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
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other arrival star : star enroute airway : dfw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7500 flight time type : 200
ASRS Report	192280
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at 11000 ft on the arrival to dfw approaching pivot intersection. TCASII suddenly gave a TA advisory and we looked for the corresponding traffic outside as well as the TCASII. A few seconds later we received a TCASII RA advisory to climb 2000 FPM. The first officer responding to the RA began the climb as per TCASII instruction and I simultaneously called ATC and told of our TCASII RA and that we were climbing. We climbed 300 ft when TCASII gave a stop climb advisory and then clear of conflict. We then advised ATC and then returned to our assigned altitude. To our knowledge there was no conflict and ATC advised that we had proper separation and no conflict. We suspect the corresponding aircraft had a high rate of climb and TCASII picked up on it to give us a TA and RA without knowing it would level off 1000 ft lower than out altitude.

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Original NASA ASRS Text

Title: FLC OF LGT AT 11000 FT ON APCH TO DFW HAD TCASII RA. CLBED 300 FT TO CLR. TFC NOT SIGHTED HAD LEVELED 1000 FT BELOW.

Narrative: WE WERE LEVEL AT 11000 FT ON THE ARR TO DFW APCHING PIVOT INTXN. TCASII SUDDENLY GAVE A TA ADVISORY AND WE LOOKED FOR THE CORRESPONDING TFC OUTSIDE AS WELL AS THE TCASII. A FEW SECONDS LATER WE RECEIVED A TCASII RA ADVISORY TO CLB 2000 FPM. THE FO RESPONDING TO THE RA BEGAN THE CLB AS PER TCASII INSTRUCTION AND I SIMULTANEOUSLY CALLED ATC AND TOLD OF OUR TCASII RA AND THAT WE WERE CLBING. WE CLBED 300 FT WHEN TCASII GAVE A STOP CLB ADVISORY AND THEN CLR OF CONFLICT. WE THEN ADVISED ATC AND THEN RETURNED TO OUR ASSIGNED ALT. TO OUR KNOWLEDGE THERE WAS NO CONFLICT AND ATC ADVISED THAT WE HAD PROPER SEPARATION AND NO CONFLICT. WE SUSPECT THE CORRESPONDING ACFT HAD A HIGH RATE OF CLB AND TCASII PICKED UP ON IT TO GIVE US A TA AND RA WITHOUT KNOWING IT WOULD LEVEL OFF 1000 FT LOWER THAN OUT ALT.

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.