Narrative:

Cma control tower claims that I deviated from a hold short instruction by rolling over a hold short bar. I believe there might have been a similar call sign on frequency. I have been based at vny for over 12 yrs and I am trained to listen very carefully to the controllers. Van nuys is the busiest GA airport in the world and I am very accustomed to high traffic areas and fast radio communications. In this occurrence I thought I was given a takeoff clearance so I proceeded past the hold short bars. As PIC I took the action to stop my aircraft clear of the active runway just past the hold short bars as I observed traffic on close final, even though I was given a clearance by ATC. I have had similar problems in the past at camarillo airport such as plane spacing problems and unreadable controllers who often get call signs mixed up. I will use this as a learning experience to pay greater attention in sits such as this. This is what I recall on the radio 'after completing my pre-takeoff check and run-up.' cma ground: grumman abl can you say your complete call sign? Me: camarillo ground, grumman abbll. Cma ground: thank you grumman abbll. Beach bonanza Y camarillo ground, bonanza Y we do not need the run-up area, request taxi to runway 26. Bonanza coming from my right to the run-up area. Cma ground: grumman abl are you ready to taxi to runway 26? Abbll: yes we are ready to taxi to runway 26 grumman abl. Cma ground: abl taxi to runway 26 and contact tower, have a good flight. Taxi to runway 26 and contact the tower thank you, grumman abbll. Abbll: camarillo tower this is grumman holding short of runway 26 at taxiway B ready for takeoff, we would like a right downwind departure. Cma tower: unreadable. Abbll: please repeat grumman abl. Cma tower: grumman abl, positi (static static) 26. Me: did you say taxi into position grumman abl? Cma tower: no hold short of runway 26. Hold short of runway 26 and can we make that a left downwind departure grumman abl. Cma tower left downwind approved hold short of runway 26. Abbll: hold short of runway 26, abl. Cma tower: abl clear for takeoff, no delay, traffic on short final. Abll: clear for takeoff on runway 26 traffic on short final. At this moment I looked to my upper right to check for landing traffic and observed a C172 on short final so I stopped the plane just as I crossed over the hold short line. I was stopping the plane clear of the active runway just over the hold short line when the tower called. Cma tower: 'grumman stop, stop you are not cleared for takeoff.' abbll: grumman holding short of runway 26. Cma tower: cessna Z go around. Cessna Z: camarillo tower can we still land? Traffic is not a factor. Cma tower: negative cessna Z I cannot legally let you land, a plane has crossed over the hold short line. Other radio chatter that I do not recall other C172 goes around. Bonanza Y: camarillo tower bonanza xxyy, we heard you give him a takeoff clearance. Cma tower: I would never give a clearance when there was traffic on short final. Bonanza Y: we heard you give him a clearance. I suggest you review your tape. Other radio chatter that I do not recall. Cma tower: grumman abl taxi into position and hold. Me: taxi into position and hold grumman abl. I taxi in position on runway 26. Cma tower: grumman abl cleared for takeoff. Me: camarillo tower, are we cleared for takeoff? Cma tower: grumman abl, cleared for takeoff.

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Original NASA ASRS Text

Title: GRUMMAN AA1 PVT PLT ACCUSED OF A RWY INCURSION BY LCL CTLR IN A CLRNC DISPUTED SIT AT CMA.

Narrative: CMA CTL TWR CLAIMS THAT I DEVIATED FROM A HOLD SHORT INSTRUCTION BY ROLLING OVER A HOLD SHORT BAR. I BELIEVE THERE MIGHT HAVE BEEN A SIMILAR CALL SIGN ON FREQ. I HAVE BEEN BASED AT VNY FOR OVER 12 YRS AND I AM TRAINED TO LISTEN VERY CAREFULLY TO THE CTLRS. VAN NUYS IS THE BUSIEST GA ARPT IN THE WORLD AND I AM VERY ACCUSTOMED TO HIGH TFC AREAS AND FAST RADIO COMS. IN THIS OCCURRENCE I THOUGHT I WAS GIVEN A TKOF CLRNC SO I PROCEEDED PAST THE HOLD SHORT BARS. AS PIC I TOOK THE ACTION TO STOP MY ACFT CLR OF THE ACTIVE RWY JUST PAST THE HOLD SHORT BARS AS I OBSERVED TFC ON CLOSE FINAL, EVEN THOUGH I WAS GIVEN A CLRNC BY ATC. I HAVE HAD SIMILAR PROBS IN THE PAST AT CAMARILLO ARPT SUCH AS PLANE SPACING PROBS AND UNREADABLE CTLRS WHO OFTEN GET CALL SIGNS MIXED UP. I WILL USE THIS AS A LEARNING EXPERIENCE TO PAY GREATER ATTN IN SITS SUCH AS THIS. THIS IS WHAT I RECALL ON THE RADIO 'AFTER COMPLETING MY PRE-TKOF CHK AND RUN-UP.' CMA GND: GRUMMAN ABL CAN YOU SAY YOUR COMPLETE CALL SIGN? ME: CAMARILLO GND, GRUMMAN ABBLL. CMA GND: THANK YOU GRUMMAN ABBLL. BEACH BONANZA Y CAMARILLO GND, BONANZA Y WE DO NOT NEED THE RUN-UP AREA, REQUEST TAXI TO RWY 26. BONANZA COMING FROM MY R TO THE RUN-UP AREA. CMA GND: GRUMMAN ABL ARE YOU READY TO TAXI TO RWY 26? ABBLL: YES WE ARE READY TO TAXI TO RWY 26 GRUMMAN ABL. CMA GND: ABL TAXI TO RWY 26 AND CONTACT TWR, HAVE A GOOD FLT. TAXI TO RWY 26 AND CONTACT THE TWR THANK YOU, GRUMMAN ABBLL. ABBLL: CAMARILLO TWR THIS IS GRUMMAN HOLDING SHORT OF RWY 26 AT TXWY B READY FOR TKOF, WE WOULD LIKE A R DOWNWIND DEP. CMA TWR: UNREADABLE. ABBLL: PLEASE REPEAT GRUMMAN ABL. CMA TWR: GRUMMAN ABL, POSITI (STATIC STATIC) 26. ME: DID YOU SAY TAXI INTO POS GRUMMAN ABL? CMA TWR: NO HOLD SHORT OF RWY 26. HOLD SHORT OF RWY 26 AND CAN WE MAKE THAT A L DOWNWIND DEP GRUMMAN ABL. CMA TWR L DOWNWIND APPROVED HOLD SHORT OF RWY 26. ABBLL: HOLD SHORT OF RWY 26, ABL. CMA TWR: ABL CLR FOR TKOF, NO DELAY, TFC ON SHORT FINAL. ABLL: CLR FOR TKOF ON RWY 26 TFC ON SHORT FINAL. AT THIS MOMENT I LOOKED TO MY UPPER R TO CHK FOR LNDG TFC AND OBSERVED A C172 ON SHORT FINAL SO I STOPPED THE PLANE JUST AS I CROSSED OVER THE HOLD SHORT LINE. I WAS STOPPING THE PLANE CLR OF THE ACTIVE RWY JUST OVER THE HOLD SHORT LINE WHEN THE TWR CALLED. CMA TWR: 'GRUMMAN STOP, STOP YOU ARE NOT CLRED FOR TKOF.' ABBLL: GRUMMAN HOLDING SHORT OF RWY 26. CMA TWR: CESSNA Z GO AROUND. CESSNA Z: CAMARILLO TWR CAN WE STILL LAND? TFC IS NOT A FACTOR. CMA TWR: NEGATIVE CESSNA Z I CANNOT LEGALLY LET YOU LAND, A PLANE HAS CROSSED OVER THE HOLD SHORT LINE. OTHER RADIO CHATTER THAT I DO NOT RECALL OTHER C172 GOES AROUND. BONANZA Y: CAMARILLO TWR BONANZA XXYY, WE HEARD YOU GIVE HIM A TKOF CLRNC. CMA TWR: I WOULD NEVER GIVE A CLRNC WHEN THERE WAS TFC ON SHORT FINAL. BONANZA Y: WE HEARD YOU GIVE HIM A CLRNC. I SUGGEST YOU REVIEW YOUR TAPE. OTHER RADIO CHATTER THAT I DO NOT RECALL. CMA TWR: GRUMMAN ABL TAXI INTO POS AND HOLD. ME: TAXI INTO POS AND HOLD GRUMMAN ABL. I TAXI IN POS ON RWY 26. CMA TWR: GRUMMAN ABL CLRED FOR TKOF. ME: CAMARILLO TWR, ARE WE CLRED FOR TKOF? CMA TWR: GRUMMAN ABL, CLRED FOR TKOF.

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.