ZFW hand off controller witnessed operational error when radar controller failed to recognize a spee...

Attributes
ACN	877865
Time
Date	201003
Local Time Of Day	1801-2400
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Aircraft 1
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Citation X (C750)
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Handoff / Assist
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

We were coming out of holding due to cross winds. High switched aircraft Y to us landing dal; the right side descended him to FL230 because of a dfw lander at FL220. High 237 switched air carrier X to us at FL240 with control for lower; r-side descended him to FL190 not noticing the 200 knot over take. When the r-side noticed it and tried to fix it he turned aircraft Y 30 left and tried to stop air carrier X at FL240. Air carrier X said he would have to go back up and got as low as fl 237 before starting back up. I don't know if air carrier X was assigned a speed or not; but he was 200 knots slower then aircraft Y. Recommendation; I use leader length to gauge speed and distance on this sector; the r-side was using the 6 mile stick.

Original NASA ASRS Text

Title: ZFW hand off controller witnessed operational error when RADAR controller failed to recognize a speed overtake situation in time to issue corrective actions.

Narrative: We were coming out of holding due to cross winds. High switched Aircraft Y to us landing DAL; the R side descended him to FL230 because of a DFW lander at FL220. High 237 switched Air Carrier X to us at FL240 with control for lower; R-side descended him to FL190 not noticing the 200 knot over take. When the R-side noticed it and tried to fix it he turned Aircraft Y 30 left and tried to stop Air Carrier X at FL240. Air Carrier X said he would have to go back up and got as low as FL 237 before starting back up. I don't know if Air Carrier X was assigned a speed or not; but he was 200 knots slower then Aircraft Y. Recommendation; I use leader length to gauge speed and distance on this sector; the R-side was using the 6 mile stick.

Data retrieved from NASA's ASRS site as of April 2012 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.

ZFW hand off controller witnessed operational error when radar controller failed to recognize a speed overtake situation in time to issue corrective actions.