Altitude deviation altitude excursion in flight crew response to TCASII TA.

Attributes
ACN	238506
Time
Date	199304
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bpr airport : dfw
State Reference	TX
Altitude	msl bound lower : 10200 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cos
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	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
Route In Use	departure other departure sid : sid enroute : on vectors
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 : 7000 flight time type : 3000
ASRS Report	238506
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 2000
ASRS Report	239058
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the boids arrival into dfw, established on the bpr 108/20, 11000 ft, 300 KTS, TCASII alerted traffic 12 O'clock low, climbing. Prior to the RA, we established visual contact and initiated a necessary climbing left turn away from traffic. TCASII then commanded an RA of 'descend'/green arc 1800-2000 FPM. We maintained visual separation and began a descent. During this maneuver, regional approach instructed us to climb and TCASII reversed its RA to 'climb immediately.' we followed instructions and climbed to 11500 ft before the conflict was resolved. Opposite direction traffic passed off our right 1-2 mi, approximately 200 ft low, climbing.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION IN FLC RESPONSE TO TCASII TA.

Narrative: ON THE BOIDS ARR INTO DFW, ESTABLISHED ON THE BPR 108/20, 11000 FT, 300 KTS, TCASII ALERTED TFC 12 O'CLOCK LOW, CLBING. PRIOR TO THE RA, WE ESTABLISHED VISUAL CONTACT AND INITIATED A NECESSARY CLBING L TURN AWAY FROM TFC. TCASII THEN COMMANDED AN RA OF 'DSND'/GREEN ARC 1800-2000 FPM. WE MAINTAINED VISUAL SEPARATION AND BEGAN A DSCNT. DURING THIS MANEUVER, REGIONAL APCH INSTRUCTED US TO CLB AND TCASII REVERSED ITS RA TO 'CLB IMMEDIATELY.' WE FOLLOWED INSTRUCTIONS AND CLBED TO 11500 FT BEFORE THE CONFLICT WAS RESOLVED. OPPOSITE DIRECTION TFC PASSED OFF OUR R 1-2 MI, APPROX 200 FT LOW, CLBING.

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.