C172 pilot had blocked frequency at sdl.

Attributes
ACN	481020
Time
Date	200008
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sdl.airport
State Reference	AZ
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : multi engine pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 225 flight time total : 21000 flight time type : 50
ASRS Report	481020
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : taxiway non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I had just landed on runway 21 (full stop). Local controller said exit at A7 and contact ground (121.6). I rogered and complied. I taxied so that my aircraft cleared the hold short line and switched to ground. Frequency was quiet, so I called and advised of my intended parking location. As soon as my transmission ended, the controller said simply, 'enter the ramp at A4.' this would have been a little out of the way, but not totally unreasonable, I thought. I then proceeded to the southwest on taxiway a. Controller then said, 'aircraft on taxiway a, say call sign.' I paused a moment to see if someone else responded. No one did, so I said my call sign and that I was proceeding sbound on taxiway a. Controller said 'enter the ramp.' I complied. At the time of the original 'enter the ramp at A4' by the controller, I felt that the controller was just sloppy in not using my call sign. In reality, I think what happened was as I called for taxi clearance to parking, controller simultaneously gave instructions to another aircraft, opposite direction down field. I assumed the instructions 'enter the ramp at A4' were for me. I've been flying long enough to never assume anything. I should have verified that the clearance was for me.

Original NASA ASRS Text

Title: C172 PLT HAD BLOCKED FREQ AT SDL.

Narrative: I HAD JUST LANDED ON RWY 21 (FULL STOP). LCL CTLR SAID EXIT AT A7 AND CONTACT GND (121.6). I ROGERED AND COMPLIED. I TAXIED SO THAT MY ACFT CLRED THE HOLD SHORT LINE AND SWITCHED TO GND. FREQ WAS QUIET, SO I CALLED AND ADVISED OF MY INTENDED PARKING LOCATION. AS SOON AS MY XMISSION ENDED, THE CTLR SAID SIMPLY, 'ENTER THE RAMP AT A4.' THIS WOULD HAVE BEEN A LITTLE OUT OF THE WAY, BUT NOT TOTALLY UNREASONABLE, I THOUGHT. I THEN PROCEEDED TO THE SW ON TXWY A. CTLR THEN SAID, 'ACFT ON TXWY A, SAY CALL SIGN.' I PAUSED A MOMENT TO SEE IF SOMEONE ELSE RESPONDED. NO ONE DID, SO I SAID MY CALL SIGN AND THAT I WAS PROCEEDING SBOUND ON TXWY A. CTLR SAID 'ENTER THE RAMP.' I COMPLIED. AT THE TIME OF THE ORIGINAL 'ENTER THE RAMP AT A4' BY THE CTLR, I FELT THAT THE CTLR WAS JUST SLOPPY IN NOT USING MY CALL SIGN. IN REALITY, I THINK WHAT HAPPENED WAS AS I CALLED FOR TAXI CLRNC TO PARKING, CTLR SIMULTANEOUSLY GAVE INSTRUCTIONS TO ANOTHER ACFT, OPPOSITE DIRECTION DOWN FIELD. I ASSUMED THE INSTRUCTIONS 'ENTER THE RAMP AT A4' WERE FOR ME. I'VE BEEN FLYING LONG ENOUGH TO NEVER ASSUME ANYTHING. I SHOULD HAVE VERIFIED THAT THE CLRNC WAS FOR ME.

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.