Narrative:

We had taxied from our ramp to intersection M which is approximately 100 yards. During this time we were running checklists. My first officer heard what he thought was a clearance for us to taxi into position and hold. All I really heard was his readback and thought I had missed a call. I released the brake, taxied across the line when I heard the controller tell us that the clearance was for a company aircraft at the end (full length). I apologized, made a 180 degree turn and left the intersection. I never actually taxied onto the runway. No traffic conflict. We acknowledged to the tower 'position and hold.' problem areas: company procedure to monitor company frequency which led to 'too much chatter in the cockpit.' at some areas at the sea airport there are 'holes' of reception. We have to hold the squelch button to hear them. If 2 airplanes acknowledged a clearance, tower should have ensured who read back. Although I had not aware of missing a clearance I should have had my first officer confirm the clearance since I did not hear it. Corrective actions: I am reducing 'radio listening load' during checklists and adjusting critical volumes as necessary and being extra careful to ensure what clrncs I have received or not received. Sea tower should look into the problems with reception of their transmitter(south) around the airport environment.

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Original NASA ASRS Text

Title: UNAUTH RWY ENTRY.

Narrative: WE HAD TAXIED FROM OUR RAMP TO INTXN M WHICH IS APPROX 100 YARDS. DURING THIS TIME WE WERE RUNNING CHKLISTS. MY FO HEARD WHAT HE THOUGHT WAS A CLRNC FOR US TO TAXI INTO POS AND HOLD. ALL I REALLY HEARD WAS HIS READBACK AND THOUGHT I HAD MISSED A CALL. I RELEASED THE BRAKE, TAXIED ACROSS THE LINE WHEN I HEARD THE CTLR TELL US THAT THE CLRNC WAS FOR A COMPANY ACFT AT THE END (FULL LENGTH). I APOLOGIZED, MADE A 180 DEG TURN AND LEFT THE INTXN. I NEVER ACTUALLY TAXIED ONTO THE RWY. NO TFC CONFLICT. WE ACKNOWLEDGED TO THE TWR 'POS AND HOLD.' PROB AREAS: COMPANY PROC TO MONITOR COMPANY FREQ WHICH LED TO 'TOO MUCH CHATTER IN THE COCKPIT.' AT SOME AREAS AT THE SEA ARPT THERE ARE 'HOLES' OF RECEPTION. WE HAVE TO HOLD THE SQUELCH BUTTON TO HEAR THEM. IF 2 AIRPLANES ACKNOWLEDGED A CLRNC, TWR SHOULD HAVE ENSURED WHO READ BACK. ALTHOUGH I HAD NOT AWARE OF MISSING A CLRNC I SHOULD HAVE HAD MY FO CONFIRM THE CLRNC SINCE I DID NOT HEAR IT. CORRECTIVE ACTIONS: I AM REDUCING 'RADIO LISTENING LOAD' DURING CHKLISTS AND ADJUSTING CRITICAL VOLUMES AS NECESSARY AND BEING EXTRA CAREFUL TO ENSURE WHAT CLRNCS I HAVE RECEIVED OR NOT RECEIVED. SEA TWR SHOULD LOOK INTO THE PROBS WITH RECEPTION OF THEIR XMITTER(S) AROUND THE ARPT ENVIRONMENT.

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.