<< >> NASA ASRS Report 918188, November 2010

ZLA controller described a TCAS RA event when minimal separation was used between level traffic and traffic climbing underneath.

Attributes
ACN	918188
Time
Date	201011
Local Time Of Day	1801-2400
Place
Locale Reference	ZLA.ARTCC
State Reference	CA
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	P180 Avanti
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Person 1
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

A B737 climbing out of las on a vector for sequencing was issued FL270 for traffic at FL280; a P180. At about FL268; the B737 reported they were responding to an RA and descending to FL260. I called traffic and they responded they would need to follow the RA then climb back to FL270 as assigned. Separation was never lost and the P180 did not change altitude from FL280. Recommendation; I should have called traffic to the B737 to alert them of the traffic at FL280.

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Original NASA ASRS Text

Title: ZLA Controller described a TCAS RA event when minimal separation was used between level traffic and traffic climbing underneath.

Narrative: A B737 climbing out of LAS on a vector for sequencing was issued FL270 for traffic at FL280; a P180. At about FL268; the B737 reported they were responding to an RA and descending to FL260. I called traffic and they responded they would need to follow the RA then climb back to FL270 as assigned. Separation was never lost and the P180 did not change altitude from FL280. Recommendation; I should have called traffic to the B737 to alert them of the traffic at FL280.

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.