A C172 pilot at sua departs on runway 34 when takeoff clearance was for runway 30. Pilot cites clear...

Attributes
ACN	717574
Time
Date	200611
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sua.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 7600 flight time type : 2500
ASRS Report	717574
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	incursion : runway non adherence : far non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Received IFR clearance from ground controller; taxied to runway hold short line for what we thought was runway 30. Switched to tower; asked for takeoff clearance; told to hold short; return to ground controller for amended clearance. Contacted ground control and received amended clearance. Returned to tower; asked for takeoff clearance; told to position and hold runway 30. Acknowledged hold in position on runway 30. After a moment; tower cleared us for takeoff. After departure; tower informed us that we departed on runway 34; not runway 30. Examining the taxi diagram; it is confusing because the tower runways intersect at the hold short line. In fact runway 34 hold short is before runway 30 and you must cross runway 34 to get to runway 30. Tower controller did not say we were on the wrong runway while in position and hold. He shares responsibility for this incident. I am responsible as PIC to assure alignment with the proper runway. The confusion over the ground controller giving me the incorrect clearance initially also contributed to the incident.

Original NASA ASRS Text

Title: A C172 PLT AT SUA DEPARTS ON RWY 34 WHEN TKOF CLRNC WAS FOR RWY 30. PLT CITES CLRNC CHANGE; PLT; AND CTLR INATTN AS FACTORS.

Narrative: RECEIVED IFR CLRNC FROM GND CTLR; TAXIED TO RWY HOLD SHORT LINE FOR WHAT WE THOUGHT WAS RWY 30. SWITCHED TO TWR; ASKED FOR TKOF CLRNC; TOLD TO HOLD SHORT; RETURN TO GND CTLR FOR AMENDED CLRNC. CONTACTED GND CTL AND RECEIVED AMENDED CLRNC. RETURNED TO TWR; ASKED FOR TKOF CLRNC; TOLD TO POS AND HOLD RWY 30. ACKNOWLEDGED HOLD IN POS ON RWY 30. AFTER A MOMENT; TWR CLRED US FOR TKOF. AFTER DEP; TWR INFORMED US THAT WE DEPARTED ON RWY 34; NOT RWY 30. EXAMINING THE TAXI DIAGRAM; IT IS CONFUSING BECAUSE THE TWR RWYS INTERSECT AT THE HOLD SHORT LINE. IN FACT RWY 34 HOLD SHORT IS BEFORE RWY 30 AND YOU MUST CROSS RWY 34 TO GET TO RWY 30. TWR CTLR DID NOT SAY WE WERE ON THE WRONG RWY WHILE IN POS AND HOLD. HE SHARES RESPONSIBILITY FOR THIS INCIDENT. I AM RESPONSIBLE AS PIC TO ASSURE ALIGNMENT WITH THE PROPER RWY. THE CONFUSION OVER THE GND CTLR GIVING ME THE INCORRECT CLRNC INITIALLY ALSO CONTRIBUTED TO THE INCIDENT.

Data retrieved from NASA's ASRS site as of January 2009 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.

A C172 pilot at sua departs on runway 34 when takeoff clearance was for runway 30. Pilot cites clearance change; pilot; and controller inattn as factors.