A turbo commander ATP pilot taxies onto runway 36 for a back taxi operation when only cleared to the runway by tower at leb, nh.

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Attributes
ACN	460915
Time
Date	200001
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : leb.airport
State Reference	NH
Altitude	agl single value : 0
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Turbo Commander 690C
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 20 flight time total : 6000 flight time type : 40
ASRS Report	460915
Person 2
Affiliation	government : faa
Function	controller : combined local
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : far non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued advisory none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was cleared by ground control to 'taxi to runway 36,' but I mistakenly thought I was cleared to 'back taxi' on runway 36 prior to takeoff, and so I entered the runway without proper clearance. There was no other aircraft in the air in the control zone at the time, so there was no potential conflict. The tower operator advised me of my error as I was back-taxiing. How the problem arose: I taxied from the hangar ramp to taxiway a and stopped there to call ground control for my IFR clearance. This is my home base and I follow this procedure 1) to get away from the hangar offices because of my noisy aircraft, 2) I am then visible from the tower. In this instance there was a new (to me) voice working both ground and tower frequencys. I received my IFR clearance and was setting up my radios, transponder and having a little trouble getting the GPS waypoint when I heard (but misinterped) the taxi clearance. I am well aware that a clearance 'to a runway' does not mean you can cross it or enter it without another proper clearance. My perception and performance was wrong, and I think my mind was preoccupied by my avionics when I should have been listening. I do not think that I read back the taxi clearance.

Original NASA ASRS Text

Title: A TURBO COMMANDER ATP PLT TAXIES ONTO RWY 36 FOR A BACK TAXI OP WHEN ONLY CLRED TO THE RWY BY TWR AT LEB, NH.

Narrative: I WAS CLRED BY GND CTL TO 'TAXI TO RWY 36,' BUT I MISTAKENLY THOUGHT I WAS CLRED TO 'BACK TAXI' ON RWY 36 PRIOR TO TKOF, AND SO I ENTERED THE RWY WITHOUT PROPER CLRNC. THERE WAS NO OTHER ACFT IN THE AIR IN THE CTL ZONE AT THE TIME, SO THERE WAS NO POTENTIAL CONFLICT. THE TWR OPERATOR ADVISED ME OF MY ERROR AS I WAS BACK-TAXIING. HOW THE PROB AROSE: I TAXIED FROM THE HANGAR RAMP TO TXWY A AND STOPPED THERE TO CALL GND CTL FOR MY IFR CLRNC. THIS IS MY HOME BASE AND I FOLLOW THIS PROC 1) TO GET AWAY FROM THE HANGAR OFFICES BECAUSE OF MY NOISY ACFT, 2) I AM THEN VISIBLE FROM THE TWR. IN THIS INSTANCE THERE WAS A NEW (TO ME) VOICE WORKING BOTH GND AND TWR FREQS. I RECEIVED MY IFR CLRNC AND WAS SETTING UP MY RADIOS, XPONDER AND HAVING A LITTLE TROUBLE GETTING THE GPS WAYPOINT WHEN I HEARD (BUT MISINTERPED) THE TAXI CLRNC. I AM WELL AWARE THAT A CLRNC 'TO A RWY' DOES NOT MEAN YOU CAN CROSS IT OR ENTER IT WITHOUT ANOTHER PROPER CLRNC. MY PERCEPTION AND PERFORMANCE WAS WRONG, AND I THINK MY MIND WAS PREOCCUPIED BY MY AVIONICS WHEN I SHOULD HAVE BEEN LISTENING. I DO NOT THINK THAT I READ BACK THE TAXI CLRNC.

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.