Aircraft climbed above assigned altitude, resulting in less than standard separation with opposite d...

Attributes
ACN	130359
Time
Date	198912
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : psk
State Reference	VA
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Operator	other
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 45 flight time total : 3200 flight time type : 20
ASRS Report	130359
Person 2
Affiliation	government other
Function	flight crew : first officer
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 17800 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On an IFR flight from lewisburg, wv to atlanta, GA, I received a climb limit to 12000' for traffic in the opp direction. Shortly after ward I called the traffic in sight, and asked about a climb clearance to higher altitude. Then I was advised that my altitude showed 300' higher than cleared. I was then handed off to the next controller at FL170. This controller informed me that I was 300' altitude off and also asked to stop mode C. Prior to conclusion of flight, mode C was tested and showed correct.

Original NASA ASRS Text

Title: ACFT CLIMBED ABOVE ASSIGNED ALT, RESULTING IN LESS THAN STANDARD SEPARATION WITH OPPOSITE DIRECTION TRAFFIC.

Narrative: ON AN IFR FLT FROM LEWISBURG, WV TO ATLANTA, GA, I RECEIVED A CLB LIMIT TO 12000' FOR TFC IN THE OPP DIRECTION. SHORTLY AFTER WARD I CALLED THE TFC IN SIGHT, AND ASKED ABOUT A CLB CLRNC TO HIGHER ALT. THEN I WAS ADVISED THAT MY ALT SHOWED 300' HIGHER THAN CLRED. I WAS THEN HANDED OFF TO THE NEXT CTLR AT FL170. THIS CTLR INFORMED ME THAT I WAS 300' ALT OFF AND ALSO ASKED TO STOP MODE C. PRIOR TO CONCLUSION OF FLT, MODE C WAS TESTED AND SHOWED CORRECT.

Data retrieved from NASA's ASRS site as of August 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.

Aircraft climbed above assigned altitude, resulting in less than standard separation with opposite direction traffic.