Pilot follows confusing instructions ending up on an active runway at houston.

Attributes
ACN	476331
Time
Date	200006
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hou.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : hou&.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 70 flight time total : 4300 flight time type : 450
ASRS Report	476331
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : clearance other anomaly other
Independent Detector	other controllerb other flight crewa
Resolutory Action	none taken : insufficient time
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

I was cleared to taxi to runway 17 at G1 and hold short. Then tower requested me to taxi to runway 12R. I requested directions to runway 12R and was told to make a 'hard left.' the only 'hard left' was onto runway 17 and across it to runway 12R. This was done and resulted in tower canceling takeoff clearance given to the B737. The boeing was not yet on the roll. I was unclr whether tower wanted a 'hard left' back to the taxiway G or to proceed as I did. I should have asked for more specific instructions.

Original NASA ASRS Text

Title: PLT FOLLOWS CONFUSING INSTRUCTIONS ENDING UP ON AN ACTIVE RWY AT HOUSTON.

Narrative: I WAS CLRED TO TAXI TO RWY 17 AT G1 AND HOLD SHORT. THEN TWR REQUESTED ME TO TAXI TO RWY 12R. I REQUESTED DIRECTIONS TO RWY 12R AND WAS TOLD TO MAKE A 'HARD L.' THE ONLY 'HARD L' WAS ONTO RWY 17 AND ACROSS IT TO RWY 12R. THIS WAS DONE AND RESULTED IN TWR CANCELING TKOF CLRNC GIVEN TO THE B737. THE BOEING WAS NOT YET ON THE ROLL. I WAS UNCLR WHETHER TWR WANTED A 'HARD L' BACK TO THE TXWY G OR TO PROCEED AS I DID. I SHOULD HAVE ASKED FOR MORE SPECIFIC INSTRUCTIONS.

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.