ARTCC trainee radar controller, receiving instruction during an apparent overtake situation, lost separation between 2 air carrier aircraft.

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Attributes
ACN	488842
Time
Date	200010
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mtu.vortac
State Reference	UT
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air taxi
Make Model Name	Learjet 24
Operating Under FAR Part	Part 135
Flight Phase	cruise : enroute altitude change descent : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : instructor
Qualification	controller : radar
Experience	controller limited radar : 2 controller non radar : 1 controller radar : 15 controller time certified in position1 : 16
ASRS Report	488842
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : radar
ASRS Report	489091
Events
Anomaly	conflict : airborne critical non adherence : published procedure
Independent Detector	other controllera other controllerb other other : ctlr 3
Resolutory Action	flight crew : took evasive action none taken : detected after the fact
Miss Distance	horizontal : 27600 vertical : 1100
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X at FL330 given descent to FL310, air carrier Y was turned out to a 270 degree heading at FL330 after air carrier X was given descent to FL310. Air carrier Y was turned direct mtu VOR air carrier X was handed off to sector 32 and frequency chang. Air carrier Y turned to mtu. Air carrier X did not descend and before he changed frequencys he reported out of FL330. Supplemental information from acn 489091: I was sequencing air carrier X and air carrier Y into slc. Air carrier X was given a clearance to FL310. Then I turned air carrier Y back to mtu with a clearance to descend to FL330. When I noticed air carrier X was not descending out of FL330 I turned air carrier Y to a 270 degree heading to separate it from air carrier X. Supplemental information from acn 489089: both aircraft were descending for arrival into slc. Air carrier Y was turned out for spacing and turned back too soon. Lateral separation was lost. Training was being done on right side. The trainee was definitely behind on keeping up with traffic.

Original NASA ASRS Text

Title: ARTCC TRAINEE RADAR CTLR, RECEIVING INSTRUCTION DURING AN APPARENT OVERTAKE SIT, LOST SEPARATION BTWN 2 ACR ACFT.

Narrative: ACR X AT FL330 GIVEN DSCNT TO FL310, ACR Y WAS TURNED OUT TO A 270 DEG HDG AT FL330 AFTER ACR X WAS GIVEN DSCNT TO FL310. ACR Y WAS TURNED DIRECT MTU VOR ACR X WAS HANDED OFF TO SECTOR 32 AND FREQ CHANG. ACR Y TURNED TO MTU. ACR X DID NOT DSND AND BEFORE HE CHANGED FREQS HE RPTED OUT OF FL330. SUPPLEMENTAL INFO FROM ACN 489091: I WAS SEQUENCING ACR X AND ACR Y INTO SLC. ACR X WAS GIVEN A CLRNC TO FL310. THEN I TURNED ACR Y BACK TO MTU WITH A CLRNC TO DSND TO FL330. WHEN I NOTICED ACR X WAS NOT DSNDING OUT OF FL330 I TURNED ACR Y TO A 270 DEG HDG TO SEPARATE IT FROM ACR X. SUPPLEMENTAL INFO FROM ACN 489089: BOTH ACFT WERE DSNDING FOR ARR INTO SLC. ACR Y WAS TURNED OUT FOR SPACING AND TURNED BACK TOO SOON. LATERAL SEPARATION WAS LOST. TRAINING WAS BEING DONE ON R SIDE. THE TRAINEE WAS DEFINITELY BEHIND ON KEEPING UP WITH TFC.

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.