An small aircraft pilot, while being observed by his instructor who was on the ground, taxied across a hold short line without a clearance, then took off in a direction opposite to his clearance.

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Attributes
ACN	543099
Time
Date	200203
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : takeoff roll ground : taxi
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 16600 flight time type : 160
ASRS Report	543099
Person 2
Affiliation	other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : student
Events
Anomaly	incursion : runway non adherence : clearance non adherence : far other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My student thought he was cleared to taxi to runway 31R at intersection A9, but was actually cleared to taxi to runway 13R at intersection A9. When he pulled up to the hold short line at intersection A9, he crossed the hold short line without a clearance. When he was cleared for takeoff, he turned onto runway 31L and took off. There was no traffic at the time and tower asked him to make a left 180 degree turn and leave class D airspace to the southeast.

Original NASA ASRS Text

Title: AN SMA PLT, WHILE BEING OBSERVED BY HIS INSTRUCTOR WHO WAS ON THE GND, TAXIED ACROSS A HOLD SHORT LINE WITHOUT A CLRNC, THEN TOOK OFF IN A DIRECTION OPPOSITE TO HIS CLRNC.

Narrative: MY STUDENT THOUGHT HE WAS CLRED TO TAXI TO RWY 31R AT INTXN A9, BUT WAS ACTUALLY CLRED TO TAXI TO RWY 13R AT INTXN A9. WHEN HE PULLED UP TO THE HOLD SHORT LINE AT INTXN A9, HE CROSSED THE HOLD SHORT LINE WITHOUT A CLRNC. WHEN HE WAS CLRED FOR TKOF, HE TURNED ONTO RWY 31L AND TOOK OFF. THERE WAS NO TFC AT THE TIME AND TWR ASKED HIM TO MAKE A L 180 DEG TURN AND LEAVE CLASS D AIRSPACE TO THE SE.

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.