Light transport readback the wrong altitude and ARTCC controller did not correct it. Controller working combined position with moderate traffic didn't see potential conflict until conflict alert activated when the light transport climbed through altitude of small aircraft.

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Attributes
ACN	88918
Time
Date	198806
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sbv
State Reference	VA
Altitude	msl bound lower : 9000 msl bound upper : 9200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sea
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Route In Use	enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 20 controller radar : 19
ASRS Report	88918
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 27000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Small aircraft X IFR at 9000' northbound on V39 south of sbv VORTAC. Light transport Y was cleared off dan climbed to 6000'. When he departed and was in radar contact he was climbed to 8000'. The pilot climbed to 10000'. He passed small aircraft X within 4.5 mi and was going through 9200'. The tape recording showed light transport Y was cleared to 8000'. The pilot read back 10000' the controller was working the sector by himself and was doing the right, left, D duties. Callback conversation with reporter revealed the following: types of aircraft were given by the reporter. Traffic vol was moderate and reporter was working a combined position operation. Traffic advisories were given when the C/a activated and traffic was sighted. Considered a minor infringement.

Original NASA ASRS Text

Title: LTT READBACK THE WRONG ALT AND ARTCC CTLR DID NOT CORRECT IT. CTLR WORKING COMBINED POSITION WITH MODERATE TRAFFIC DIDN'T SEE POTENTIAL CONFLICT UNTIL CONFLICT ALERT ACTIVATED WHEN THE LTT CLIMBED THROUGH ALT OF SMA.

Narrative: SMA X IFR AT 9000' NBOUND ON V39 S OF SBV VORTAC. LTT Y WAS CLRED OFF DAN CLBED TO 6000'. WHEN HE DEPARTED AND WAS IN RADAR CONTACT HE WAS CLBED TO 8000'. THE PLT CLBED TO 10000'. HE PASSED SMA X WITHIN 4.5 MI AND WAS GOING THROUGH 9200'. THE TAPE RECORDING SHOWED LTT Y WAS CLRED TO 8000'. THE PLT READ BACK 10000' THE CTLR WAS WORKING THE SECTOR BY HIMSELF AND WAS DOING THE R, L, D DUTIES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: TYPES OF ACFT WERE GIVEN BY THE RPTR. TFC VOL WAS MODERATE AND RPTR WAS WORKING A COMBINED POS OPERATION. TFC ADVISORIES WERE GIVEN WHEN THE C/A ACTIVATED AND TFC WAS SIGHTED. CONSIDERED A MINOR INFRINGEMENT.

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.