Small aircraft twin taxied without clearance after landing ack. He assumed he was cleared to taxi.

Attributes
ACN	366050
Time
Date	199704
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ack
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	general aviation : personal
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	ground other : taxi
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 20 flight time total : 2075 flight time type : 1000
ASRS Report	366050
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Landed, tower said do a 180 degree turn and taxi back. At the time I assumed I was cleared to taxi to tie-down, which is near where I exited runway. I should have doublechked when I cleared the runway. There was no other radio communication. No other aircraft were moving or on txwys. I was distraction by noise and talking by passenger. It was an error on my part, I should have checked with ground.

Original NASA ASRS Text

Title: SMA TWIN TAXIED WITHOUT CLRNC AFTER LNDG ACK. HE ASSUMED HE WAS CLRED TO TAXI.

Narrative: LANDED, TWR SAID DO A 180 DEG TURN AND TAXI BACK. AT THE TIME I ASSUMED I WAS CLRED TO TAXI TO TIE-DOWN, WHICH IS NEAR WHERE I EXITED RWY. I SHOULD HAVE DOUBLECHKED WHEN I CLRED THE RWY. THERE WAS NO OTHER RADIO COM. NO OTHER ACFT WERE MOVING OR ON TXWYS. I WAS DISTR BY NOISE AND TALKING BY PAX. IT WAS AN ERROR ON MY PART, I SHOULD HAVE CHKED WITH GND.

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.