<< >> NASA ASRS Report 364314, March 1997

Reported less than standard separation when reporter failed to notice the navigation turn of an AJ25 which conflicted with a C560 at the same altitude.

Attributes
ACN	364314
Time
Date	199703
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gri
State Reference	NE
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	IAI1125 (Astra)
Operating Under FAR Part	Part 91
Flight Phase	cruise other cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 16
ASRS Report	364314
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #2 was a test flight off lincoln. Aircraft #1 was oma departure wbound both at FL350. Aircraft #2 made a left turn at gri and was in conflict with aircraft #1. Aircraft #2 was given descent clearance to FL330 twice, but no response from pilot. Aircraft #1 was then given descent clearance to FL330. He responded. At that point I noticed aircraft #2 was also in a descent. Aircraft #2 was then told twice to climb to and maintain FL350, but no response from pilot. Aircraft #2 was now below aircraft #1 so I issued climb to aircraft #1 to FL350. I then noticed aircraft #2 was also in a climb. I then issued descent to aircraft #1 and maintain FL350 to aircraft #2. Aircraft #2 responded and reported level at FL350. Aircraft #1 was given further descent to FL310. Separation was lost. The situation could have been avoided if I had noticed aircraft #2 would be making a south turn at gri. And if aircraft #2 had responded to my initial descent clrncs.

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Original NASA ASRS Text

Title: RPTED LTSS WHEN RPTR FAILED TO NOTICE THE NAV TURN OF AN AJ25 WHICH CONFLICTED WITH A C560 AT THE SAME ALT.

Narrative: ACFT #2 WAS A TEST FLT OFF LINCOLN. ACFT #1 WAS OMA DEP WBOUND BOTH AT FL350. ACFT #2 MADE A L TURN AT GRI AND WAS IN CONFLICT WITH ACFT #1. ACFT #2 WAS GIVEN DSCNT CLRNC TO FL330 TWICE, BUT NO RESPONSE FROM PLT. ACFT #1 WAS THEN GIVEN DSCNT CLRNC TO FL330. HE RESPONDED. AT THAT POINT I NOTICED ACFT #2 WAS ALSO IN A DSCNT. ACFT #2 WAS THEN TOLD TWICE TO CLB TO AND MAINTAIN FL350, BUT NO RESPONSE FROM PLT. ACFT #2 WAS NOW BELOW ACFT #1 SO I ISSUED CLB TO ACFT #1 TO FL350. I THEN NOTICED ACFT #2 WAS ALSO IN A CLB. I THEN ISSUED DSCNT TO ACFT #1 AND MAINTAIN FL350 TO ACFT #2. ACFT #2 RESPONDED AND RPTED LEVEL AT FL350. ACFT #1 WAS GIVEN FURTHER DSCNT TO FL310. SEPARATION WAS LOST. THE SIT COULD HAVE BEEN AVOIDED IF I HAD NOTICED ACFT #2 WOULD BE MAKING A S TURN AT GRI. AND IF ACFT #2 HAD RESPONDED TO MY INITIAL DSCNT CLRNCS.

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.