Possible less than standard separation between air carrier X and air carrier Y. Possible system error. Air carrier X altitude overshot on climb. Pilot deviation.

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Attributes
ACN	176543
Time
Date	199104
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mem
State Reference	TN
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mem
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 15000
ASRS Report	176543
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7500 flight time type : 3000
ASRS Report	176545
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew faa : investigated
Miss Distance	horizontal : 1200 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Air carrier X same inbound to mem VOR on assigned heading of 300 degree and 210 KTS. Approach gave us a turn to 270 degree, almost immediately thereafter told us to climb immediately to 7000'. We complied and overshot altitude to 7200'. A later turn to 360 degree was assigned and remainder of vectors and lndgs were normal. During a telephone conversation with an approach control supervisor he told me that this incident was being investigated for a possible loss of sep with air carrier Y at our same altitude (6000'). At no time did I or my first officer see any other aircraft. Supplemental information from acn 176545. Air carrier X on approach to mem at 6000' and 300 degree heading, approach control said: 'air carrier X turn left heading 270 now, climb to 7000' now.' after turn was made nd level at 7000' we were advised traffic no longer in conflict.

Original NASA ASRS Text

Title: POSSIBLE LESS THAN STANDARD SEPARATION BETWEEN ACR X AND ACR Y. POSSIBLE SYSTEM ERROR. ACR X ALT OVERSHOT ON CLIMB. PLTDEV.

Narrative: ACR X SAME INBND TO MEM VOR ON ASSIGNED HDG OF 300 DEG AND 210 KTS. APCH GAVE US A TURN TO 270 DEG, ALMOST IMMEDIATELY THEREAFTER TOLD US TO CLB IMMEDIATELY TO 7000'. WE COMPLIED AND OVERSHOT ALT TO 7200'. A LATER TURN TO 360 DEG WAS ASSIGNED AND REMAINDER OF VECTORS AND LNDGS WERE NORMAL. DURING A TELEPHONE CONVERSATION WITH AN APCH CTL SUPVR HE TOLD ME THAT THIS INCIDENT WAS BEING INVESTIGATED FOR A POSSIBLE LOSS OF SEP WITH ACR Y AT OUR SAME ALT (6000'). AT NO TIME DID I OR MY F/O SEE ANY OTHER ACFT. SUPPLEMENTAL INFO FROM ACN 176545. ACR X ON APCH TO MEM AT 6000' AND 300 DEG HDG, APCH CTL SAID: 'ACR X TURN L HDG 270 NOW, CLB TO 7000' NOW.' AFTER TURN WAS MADE ND LEVEL AT 7000' WE WERE ADVISED TFC NO LONGER IN CONFLICT.

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.