Narrative:

We were given a clearance to runway 34 via runway 21, even though we had just landed a few mins earlier on runway 3. I acknowledged clearance and instructed copilot to begin taxi. Runway 34 intersects runway 3/21 at approximately its midlength position. There is no taxiway to this runway's approach end. It requires a back taxi. We taxied down runway 21 and approached the intersection of 34/21. My copilot began to cross runway 34 thinking we were taxiing to runway 3 for departure. Upon realizing this, I stopped him and instructed him to turn onto runway 34 to begin our back taxi to the approach end. At this point the tower controller called us to inform us that we had not been cleared onto the runway. Neither one of us remembered the clearance indicating anything about holding short, but assumed we were cleared to the approach end of the runway (although the copilot had apparently misunderstood which runway we were to use). As stated previously this was a very low traffic area with a non federal tower. The lack of a taxiway to this runway making a long back taxi necessary is especially unusual. Pilots should be especially diligent when operating in this type of situation. In addition, tower personnel should add additional 'hold short' instructions for use of this runway.

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Original NASA ASRS Text

Title: TWO MAN FLT CREW ATX INVOLVED IN TRAINING ON A FERRY FLT FROM HLG TAXIED ONTO ACTIVE RWY WITHOUT AUTH.

Narrative: WE WERE GIVEN A CLRNC TO RWY 34 VIA RWY 21, EVEN THOUGH WE HAD JUST LANDED A FEW MINS EARLIER ON RWY 3. I ACKNOWLEDGED CLRNC AND INSTRUCTED COPLT TO BEGIN TAXI. RWY 34 INTERSECTS RWY 3/21 AT APPROX ITS MIDLENGTH POS. THERE IS NO TXWY TO THIS RWY'S APCH END. IT REQUIRES A BACK TAXI. WE TAXIED DOWN RWY 21 AND APCHED THE INTXN OF 34/21. MY COPLT BEGAN TO CROSS RWY 34 THINKING WE WERE TAXIING TO RWY 3 FOR DEP. UPON REALIZING THIS, I STOPPED HIM AND INSTRUCTED HIM TO TURN ONTO RWY 34 TO BEGIN OUR BACK TAXI TO THE APCH END. AT THIS POINT THE TWR CTLR CALLED US TO INFORM US THAT WE HAD NOT BEEN CLRED ONTO THE RWY. NEITHER ONE OF US REMEMBERED THE CLRNC INDICATING ANYTHING ABOUT HOLDING SHORT, BUT ASSUMED WE WERE CLRED TO THE APCH END OF THE RWY (ALTHOUGH THE COPLT HAD APPARENTLY MISUNDERSTOOD WHICH RWY WE WERE TO USE). AS STATED PREVIOUSLY THIS WAS A VERY LOW TFC AREA WITH A NON FEDERAL TWR. THE LACK OF A TXWY TO THIS RWY MAKING A LONG BACK TAXI NECESSARY IS ESPECIALLY UNUSUAL. PLTS SHOULD BE ESPECIALLY DILIGENT WHEN OPERATING IN THIS TYPE OF SITUATION. IN ADDITION, TWR PERSONNEL SHOULD ADD ADDITIONAL 'HOLD SHORT' INSTRUCTIONS FOR USE OF THIS RWY.

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.