<< >> NASA ASRS Report 446987, August 1999

Aircraft X was climbed to the same altitude that was occupied by aircraft Y, resulting in loss of standard separation.

Attributes
ACN	446987
Time
Date	199908
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : ekn.vortac
State Reference	WV
Altitude	msl bound lower : 31000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 12 controller radar : 4
ASRS Report	446987
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : error detection other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to original clearance flight crew : took evasive action none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 19308 vertical : 1500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X requested FL350, was level at FL310. Climbed aircraft X to FL350, did not have horizontal separation established. Conflict alert activated. Descended aircraft X back to FL310 with an expedite clearance.

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Original NASA ASRS Text

Title: ACFT X WAS CLBED TO THE SAME ALT THAT WAS OCCUPIED BY ACFT Y, RESULTING IN LOSS OF STANDARD SEPARATION.

Narrative: ACFT X REQUESTED FL350, WAS LEVEL AT FL310. CLBED ACFT X TO FL350, DID NOT HAVE HORIZ SEPARATION ESTABLISHED. CONFLICT ALERT ACTIVATED. DSNDED ACFT X BACK TO FL310 WITH AN EXPEDITE CLRNC.

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.