MO21 pilot interps 'roger' to mean 'cleared.'

Attributes
ACN	592521
Time
Date	200308
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	general aviation : personal
Make Model Name	M-20 J (201)
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 1650 flight time type : 300
ASRS Report	592521
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	non adherence : clearance
Independent Detector	atc equipment other atc equipment : radar other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on an instrument flight plan for ahh, wi, to microphone, I requested ATC permission to fly the GPS runway 14L on my own navigation. The controller responded 'roger.' I initiated a right turn to fly direct to the IAP, at which time the controller advised me that I had not been cleared to fly the GPS runway 14L (I no uncertain terms) and ordered me to turn left to 260 degree heading. My suggestion is that ATC use clrer language in this situation, such as 'stand by for clearance,' rather than a simple 'roger.' as far as I know, this deviation did not create a conflict with other traffic in the area.

Original NASA ASRS Text

Title: MO21 PLT INTERPS 'ROGER' TO MEAN 'CLRED.'

Narrative: WHILE ON AN INST FLT PLAN FOR AHH, WI, TO MIC, I REQUESTED ATC PERMISSION TO FLY THE GPS RWY 14L ON MY OWN NAV. THE CTLR RESPONDED 'ROGER.' I INITIATED A R TURN TO FLY DIRECT TO THE IAP, AT WHICH TIME THE CTLR ADVISED ME THAT I HAD NOT BEEN CLRED TO FLY THE GPS RWY 14L (I NO UNCERTAIN TERMS) AND ORDERED ME TO TURN L TO 260 DEG HDG. MY SUGGESTION IS THAT ATC USE CLRER LANGUAGE IN THIS SIT, SUCH AS 'STAND BY FOR CLRNC,' RATHER THAN A SIMPLE 'ROGER.' AS FAR AS I KNOW, THIS DEV DID NOT CREATE A CONFLICT WITH OTHER TFC IN THE AREA.

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.