Small aircraft taxies into position on active runway without clearance.

Attributes
ACN	165329
Time
Date	199012
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gmu
State Reference	SC
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	ground : holding ground other : taxi
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 40 flight time total : 450 flight time type : 100
ASRS Report	165329
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	incursion : runway
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I entered the active runway for departure west/O contacting the tower. When I realized the error I stopped on the active and called the tower, announcing that I was ready to depart. The tower cleared me for takeoff. This incident is a human performance failure perhaps caused by cockpit confusion just prior to departure. At my request, ground control had altered my departure instruction. I had changed frequencys to request this route change and I believe this unusual procedure upset my normal pattern.

Original NASA ASRS Text

Title: SMA TAXIES INTO POSITION ON ACTIVE RWY WITHOUT CLRNC.

Narrative: I ENTERED THE ACTIVE RWY FOR DEP W/O CONTACTING THE TWR. WHEN I REALIZED THE ERROR I STOPPED ON THE ACTIVE AND CALLED THE TWR, ANNOUNCING THAT I WAS READY TO DEPART. THE TWR CLRED ME FOR TKOF. THIS INCIDENT IS A HUMAN PERFORMANCE FAILURE PERHAPS CAUSED BY COCKPIT CONFUSION JUST PRIOR TO DEP. AT MY REQUEST, GND CTL HAD ALTERED MY DEP INSTRUCTION. I HAD CHANGED FREQS TO REQUEST THIS RTE CHANGE AND I BELIEVE THIS UNUSUAL PROC UPSET MY NORMAL PATTERN.

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.