Flight crew of air carrier large transport aircraft deviated from assigned altitude in response to a...

Attributes
ACN	232703
Time
Date	199301
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : buj
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	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : dfw
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 170 flight time total : 18000 flight time type : 10500
ASRS Report	232703
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 5500 flight time type : 1500
ASRS Report	232301
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
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	vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the dfw blue ridge 3 arrival, 2 mi northeast of hamak intersection at 11000 ft, we received a TCASII alert. We first had a yellow TA followed by a red RA accompanied by an aural climb command. With the sun in our eyes we couldn't visually identify the traffic. Unable to contact ATC due to the saturation of radio xmissions, we climbed to 11500 ft. At this time we received an aural 'monitor vertical speed.' we leveled at 11500 ft, notified ATC of what happened and since the conflict no longer existed we descended back to 11000 ft. We concluded the climbing aircraft was climbing at such a high rate of climb it set off the warning. The normal initial climb altitude on the dfw departure is 10000 ft. We don't know if he climbed above that altitude! I have talked to a TCASII manufacturer representative who helped design the TCASII and he said this is called the dfw bump. He told me they have just received approval from the FAA to reprogram TCASII to eliminate this type of situation.

Original NASA ASRS Text

Title: FLC OF ACR LGT ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: ON THE DFW BLUE RIDGE 3 ARR, 2 MI NE OF HAMAK INTXN AT 11000 FT, WE RECEIVED A TCASII ALERT. WE FIRST HAD A YELLOW TA FOLLOWED BY A RED RA ACCOMPANIED BY AN AURAL CLB COMMAND. WITH THE SUN IN OUR EYES WE COULDN'T VISUALLY IDENT THE TFC. UNABLE TO CONTACT ATC DUE TO THE SATURATION OF RADIO XMISSIONS, WE CLBED TO 11500 FT. AT THIS TIME WE RECEIVED AN AURAL 'MONITOR VERT SPD.' WE LEVELED AT 11500 FT, NOTIFIED ATC OF WHAT HAPPENED AND SINCE THE CONFLICT NO LONGER EXISTED WE DSNDED BACK TO 11000 FT. WE CONCLUDED THE CLBING ACFT WAS CLBING AT SUCH A HIGH RATE OF CLB IT SET OFF THE WARNING. THE NORMAL INITIAL CLB ALT ON THE DFW DEP IS 10000 FT. WE DON'T KNOW IF HE CLBED ABOVE THAT ALT! I HAVE TALKED TO A TCASII MANUFACTURER REPRESENTATIVE WHO HELPED DESIGN THE TCASII AND HE SAID THIS IS CALLED THE DFW BUMP. HE TOLD ME THEY HAVE JUST RECEIVED APPROVAL FROM THE FAA TO REPROGRAM TCASII TO ELIMINATE THIS TYPE OF SIT.

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.

Flight crew of air carrier large transport aircraft deviated from assigned altitude in response to a TCASII RA.