GA pilot descends through assigned altitude conflicting with BE90 opposite direction course.

Attributes
ACN	465962
Time
Date	200003
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : mol.vor
Altitude	msl bound lower : 16000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
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 taxi
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	465962
Person 2
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	flight crew : returned to assigned altitude
Miss Distance	vertical : 1900
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft #1 had descent clearance to 17000 ft. Aircraft #2 was at 16000 ft, traveling in opposite direction. Aircraft #1 descended through 16400 ft, leveling at 16000 ft prior to reclbing to 17000 ft.

Original NASA ASRS Text

Title: GA PLT DSNDS THROUGH ASSIGNED ALT CONFLICTING WITH BE90 OPPOSITE DIRECTION COURSE.

Narrative: ACFT #1 HAD DSCNT CLRNC TO 17000 FT. ACFT #2 WAS AT 16000 FT, TRAVELING IN OPPOSITE DIRECTION. ACFT #1 DSNDED THROUGH 16400 FT, LEVELING AT 16000 FT PRIOR TO RECLBING TO 17000 FT.

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.