Possible traffic conflict because of ARTCC conducting training.

Attributes
ACN	277950
Time
Date	199407
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tnv
State Reference	TX
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	descent other
Route In Use	arrival star : star enroute airway : zhu
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	cruise other descent other
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time total : 13000
ASRS Report	277950
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 60 flight time total : 7600 flight time type : 800
ASRS Report	277957
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

En route from dal to hou on jul/xx/94 we were cleared to descend so as to cross 5 DME north of tnv VOR at and maintain 9000 and cleared for the struk 8 arrival to hou. Descending through 10400 ft we were told to maintain 10000 ft. Leveling at 10000 ft we were told to turn right 30 degrees which we did. As that turn was completed we were told to turn further right another 30 degrees. Just as we rolled out of that turn on the new heading, a different voice said 'nxx climb immediately to 11000 ft, climb now.' because of the urgent tone of voice, I immediately pulled back on the yoke and executed about a 2G pullup, climbing to 11000 ft within 15-20 seconds. We also heard the new controller talking to another aircraft directing him to 9000 ft. After determining that we were level at 11000 ft, the controller cleared us direct to tnv. Later, when we asked what that was all about, the controller said 'there is some training in progress, sorry about that' and later when he handed us off, 'thanks for your help.'

Original NASA ASRS Text

Title: POSSIBLE TFC CONFLICT BECAUSE OF ARTCC CONDUCTING TRAINING.

Narrative: ENRTE FROM DAL TO HOU ON JUL/XX/94 WE WERE CLRED TO DSND SO AS TO CROSS 5 DME N OF TNV VOR AT AND MAINTAIN 9000 AND CLRED FOR THE STRUK 8 ARR TO HOU. DSNDING THROUGH 10400 FT WE WERE TOLD TO MAINTAIN 10000 FT. LEVELING AT 10000 FT WE WERE TOLD TO TURN R 30 DEGS WHICH WE DID. AS THAT TURN WAS COMPLETED WE WERE TOLD TO TURN FURTHER R ANOTHER 30 DEGS. JUST AS WE ROLLED OUT OF THAT TURN ON THE NEW HDG, A DIFFERENT VOICE SAID 'NXX CLB IMMEDIATELY TO 11000 FT, CLB NOW.' BECAUSE OF THE URGENT TONE OF VOICE, I IMMEDIATELY PULLED BACK ON THE YOKE AND EXECUTED ABOUT A 2G PULLUP, CLBING TO 11000 FT WITHIN 15-20 SECONDS. WE ALSO HEARD THE NEW CTLR TALKING TO ANOTHER ACFT DIRECTING HIM TO 9000 FT. AFTER DETERMINING THAT WE WERE LEVEL AT 11000 FT, THE CTLR CLRED US DIRECT TO TNV. LATER, WHEN WE ASKED WHAT THAT WAS ALL ABOUT, THE CTLR SAID 'THERE IS SOME TRAINING IN PROGRESS, SORRY ABOUT THAT' AND LATER WHEN HE HANDED US OFF, 'THANKS FOR YOUR HELP.'

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.