Pilot of a mooney M28K (MO2K) overshot assigned altitude on climb causing less than standard separation with another aircraft that was cleared to descend the altitude above.

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Attributes
ACN	412170
Time
Date	199808
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ubg airport : uao
State Reference	OR
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	M-20 K (231)
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute airway : pdx
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 39 flight time total : 2328 flight time type : 1500
ASRS Report	412170
Person 2
Function	flight crew : single pilot
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was on an IFR flight plan uao to sun river (S21) on the eastern side of the cascades. I filed IFR because of a marine fog layer west of the cascades that extended from 3000 ft to 5000 ft. I planned to cancel IFR and use flight following after clearing the fog layer. On climb out I was given multiple assigned altitudes, the last one being 9000 ft. At this time the WX was VMC above the marine layer and I was about to cancel IFR. Before this was accomplished I inadvertently let my plane continue its climb to 9500 ft. Pdx approach had cleared another plane in the general area to descend to 10000 ft. I and my passenger did not ever see this other plane, despite clear conditions. The other plane did not note us either according to radio communications. The controller, however, stated we had produced a possible conflict in altitude separation. The problem would have been avoided if I had been more diligent and attentive to the assigned altitude. I let myself be sidetracked by the clear skies, by my intent to switch from IFR to VFR, and my overreliance on ATC.

Original NASA ASRS Text

Title: PLT OF A MOONEY M28K (MO2K) OVERSHOT ASSIGNED ALT ON CLB CAUSING LTSS WITH ANOTHER ACFT THAT WAS CLRED TO DSND THE ALT ABOVE.

Narrative: I WAS ON AN IFR FLT PLAN UAO TO SUN RIVER (S21) ON THE EASTERN SIDE OF THE CASCADES. I FILED IFR BECAUSE OF A MARINE FOG LAYER W OF THE CASCADES THAT EXTENDED FROM 3000 FT TO 5000 FT. I PLANNED TO CANCEL IFR AND USE FLT FOLLOWING AFTER CLRING THE FOG LAYER. ON CLBOUT I WAS GIVEN MULTIPLE ASSIGNED ALTS, THE LAST ONE BEING 9000 FT. AT THIS TIME THE WX WAS VMC ABOVE THE MARINE LAYER AND I WAS ABOUT TO CANCEL IFR. BEFORE THIS WAS ACCOMPLISHED I INADVERTENTLY LET MY PLANE CONTINUE ITS CLB TO 9500 FT. PDX APCH HAD CLRED ANOTHER PLANE IN THE GENERAL AREA TO DSND TO 10000 FT. I AND MY PAX DID NOT EVER SEE THIS OTHER PLANE, DESPITE CLR CONDITIONS. THE OTHER PLANE DID NOT NOTE US EITHER ACCORDING TO RADIO COMS. THE CTLR, HOWEVER, STATED WE HAD PRODUCED A POSSIBLE CONFLICT IN ALT SEPARATION. THE PROB WOULD HAVE BEEN AVOIDED IF I HAD BEEN MORE DILIGENT AND ATTENTIVE TO THE ASSIGNED ALT. I LET MYSELF BE SIDETRACKED BY THE CLR SKIES, BY MY INTENT TO SWITCH FROM IFR TO VFR, AND MY OVERRELIANCE ON ATC.

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.