A taxiing PA31-350 pilot crosses runway 6R without clearance when he had read back cleared to runway...

Attributes
ACN	450104
Time
Date	199909
Day	Fri
Local Time Of Day	0601 To 1200
Place
State Reference	GU
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sbgl.tower
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 2200 flight time type : 500
ASRS Report	450104
Person 2
Affiliation	other
Function	controller : combined local
Qualification	controller : non radar
Events
Anomaly	incursion : runway 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	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I am very wary of taxi clrncs that clear you to one runway that requires the crossing of another en route. In this instance, the clearance I received was 'taxi to runway 6L via taxiway D.' this required me to cross runway 6R in the process and is not an uncommon clearance for me to receive. I read back the clearance as I heard it and set off. As I was clearing runway 6R and taxiway D en route to runway 6L, ground/tower (the controller was working both position) came on and said that I had only been cleared to runway 6R at taxiway D. I am positive heard runway 6L in the initial clearance. My concern is that, if I was incorrect in my readback, why was it not noticed? Is that not the reason we read clrncs back? By my recollection, I was the only traffic they were working at that moment, but maybe workload was a factor in the cabin attendant. On several previous occasions, when cleared to runway 6L, they corrected themselves after my readback. In the future, I will query them harder if I am suspicious and not just count on a readback to keep things clear. I will hate to continually question the intentions of controllers, but if pilots are held responsible for bad clrncs and uncaught bad readbacks, then we have to do it to protect ourselves. In addition, it would be wise for me to write down even the simplest taxi clearance, as after several days on duty, it becomes difficult to remember what you have heard.

Original NASA ASRS Text

Title: A TAXIING PA31-350 PLT CROSSES RWY 6R WITHOUT CLRNC WHEN HE HAD READ BACK CLRED TO RWY 6L WITHOUT ANY CORRECTION BY CONTRACT CTLR AT PGUM, GU.

Narrative: I AM VERY WARY OF TAXI CLRNCS THAT CLR YOU TO ONE RWY THAT REQUIRES THE XING OF ANOTHER ENRTE. IN THIS INSTANCE, THE CLRNC I RECEIVED WAS 'TAXI TO RWY 6L VIA TXWY D.' THIS REQUIRED ME TO CROSS RWY 6R IN THE PROCESS AND IS NOT AN UNCOMMON CLRNC FOR ME TO RECEIVE. I READ BACK THE CLRNC AS I HEARD IT AND SET OFF. AS I WAS CLRING RWY 6R AND TXWY D ENRTE TO RWY 6L, GND/TWR (THE CTLR WAS WORKING BOTH POS) CAME ON AND SAID THAT I HAD ONLY BEEN CLRED TO RWY 6R AT TXWY D. I AM POSITIVE HEARD RWY 6L IN THE INITIAL CLRNC. MY CONCERN IS THAT, IF I WAS INCORRECT IN MY READBACK, WHY WAS IT NOT NOTICED? IS THAT NOT THE REASON WE READ CLRNCS BACK? BY MY RECOLLECTION, I WAS THE ONLY TFC THEY WERE WORKING AT THAT MOMENT, BUT MAYBE WORKLOAD WAS A FACTOR IN THE CAB. ON SEVERAL PREVIOUS OCCASIONS, WHEN CLRED TO RWY 6L, THEY CORRECTED THEMSELVES AFTER MY READBACK. IN THE FUTURE, I WILL QUERY THEM HARDER IF I AM SUSPICIOUS AND NOT JUST COUNT ON A READBACK TO KEEP THINGS CLR. I WILL HATE TO CONTINUALLY QUESTION THE INTENTIONS OF CTLRS, BUT IF PLTS ARE HELD RESPONSIBLE FOR BAD CLRNCS AND UNCAUGHT BAD READBACKS, THEN WE HAVE TO DO IT TO PROTECT OURSELVES. IN ADDITION, IT WOULD BE WISE FOR ME TO WRITE DOWN EVEN THE SIMPLEST TAXI CLRNC, AS AFTER SEVERAL DAYS ON DUTY, IT BECOMES DIFFICULT TO REMEMBER WHAT YOU HAVE HEARD.

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.

A taxiing PA31-350 pilot crosses runway 6R without clearance when he had read back cleared to runway 6L without any correction by contract controller at pgum, gu.