Potential conflict in proximity of holding fix. System error.

Attributes
ACN	283446
Time
Date	199409
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : buj
State Reference	TX
Altitude	msl bound lower : 33000 msl bound upper : 33700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 11000 flight time type : 2400
ASRS Report	283446
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 4000
ASRS Report	283941
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 16200 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Proceeding outbound in holding pattern at 'conny' intersection. Got TCASII advisory 'traffic, traffic.' TCASII showed traffic 12 O'clock, 10 NM, same altitude. Then almost immediately, got TCASII RA 'climb, climb.' captain took control of aircraft , disengaged autoplt and initiated a climbing right turn. Simultaneously, ZFW directed us to 'turn right 45 degrees and descend to FL310 immediately!' by that time, however, we were already climbing and received a 'clear-of-conflict' aural from the TCASII (maximum altitude was to FL337). Later telephone conversation revealed that ZFW had reviewed their tapes and would accept fault. They also advised that we had separation of 800 ft vertically and 2.7 NM horizontally. Supplemental information from acn 283941: open arrival at dfw I contacted our company flight control. Company contacted atl whom had already reviewed the tapes.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT IN PROX OF HOLDING FIX. SYS ERROR.

Narrative: PROCEEDING OUTBOUND IN HOLDING PATTERN AT 'CONNY' INTXN. GOT TCASII ADVISORY 'TFC, TFC.' TCASII SHOWED TFC 12 O'CLOCK, 10 NM, SAME ALT. THEN ALMOST IMMEDIATELY, GOT TCASII RA 'CLB, CLB.' CAPT TOOK CTL OF ACFT , DISENGAGED AUTOPLT AND INITIATED A CLBING R TURN. SIMULTANEOUSLY, ZFW DIRECTED US TO 'TURN R 45 DEGS AND DSND TO FL310 IMMEDIATELY!' BY THAT TIME, HOWEVER, WE WERE ALREADY CLBING AND RECEIVED A 'CLR-OF-CONFLICT' AURAL FROM THE TCASII (MAX ALT WAS TO FL337). LATER TELEPHONE CONVERSATION REVEALED THAT ZFW HAD REVIEWED THEIR TAPES AND WOULD ACCEPT FAULT. THEY ALSO ADVISED THAT WE HAD SEPARATION OF 800 FT VERTLY AND 2.7 NM HORIZLY. SUPPLEMENTAL INFO FROM ACN 283941: OPEN ARR AT DFW I CONTACTED OUR COMPANY FLT CTL. COMPANY CONTACTED ATL WHOM HAD ALREADY REVIEWED THE TAPES.

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.