Narrative:

Flight conditions and terrain were ideal for VFR-on-top on IFR flight plan from twin falls, identification, to greely, co. ZDV gave me instructions and route V-4 to be responsible for my own terrain clearance. I was deviating south of the airway V-4 to do this. Center gave me another center controller approaching laramie who told me over the air how dangerous and fool hardy I was. The center was very busy at the time so communications or lack of was a factor. I think the second ZDV controller is not familiar with VFR on top operation. Granted given the terrain and oxygen required at the MEA, this procedure sometimes upsets the controller. I was on oxygen IFR on top. There was no conflict of traffic.

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Original NASA ASRS Text

Title: BEECH B95 PLT FILED AND FLEW IFR ON TOP OVER RUGGED MOUNTAINOUS TERRAIN CAUSING HDOF ARTCC RADAR CTLR TO CRITICIZE PLT OF THE DANGERS OF THIS TYPE OF OP.

Narrative: FLT CONDITIONS AND TERRAIN WERE IDEAL FOR VFR-ON-TOP ON IFR FLT PLAN FROM TWIN FALLS, ID, TO GREELY, CO. ZDV GAVE ME INSTRUCTIONS AND RTE V-4 TO BE RESPONSIBLE FOR MY OWN TERRAIN CLRNC. I WAS DEVIATING S OF THE AIRWAY V-4 TO DO THIS. CTR GAVE ME ANOTHER CTR CTLR APCHING LARAMIE WHO TOLD ME OVER THE AIR HOW DANGEROUS AND FOOL HARDY I WAS. THE CTR WAS VERY BUSY AT THE TIME SO COMS OR LACK OF WAS A FACTOR. I THINK THE SECOND ZDV CTLR IS NOT FAMILIAR WITH VFR ON TOP OP. GRANTED GIVEN THE TERRAIN AND OXYGEN REQUIRED AT THE MEA, THIS PROC SOMETIMES UPSETS THE CTLR. I WAS ON OXYGEN IFR ON TOP. THERE WAS NO CONFLICT OF TFC.

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.