An small transport crew taxied to take off runway at yip without a clearance.

Attributes
ACN	531058
Time
Date	200111
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : yip.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : charter
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 119
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 58 flight time total : 20000 flight time type : 2500
ASRS Report	531058
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	incursion : taxiway non adherence : published procedure non adherence : far non adherence : clearance other anomaly other
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 Airport ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My copilot was already in the cockpit. When I finished my preflight, I shut the load door. As I was doing so, I could hear him talking to ground control at yip. I heard him say 'cleared to runway 23R.' we ran the before and start checklists. I started both engines and started my taxi. Ground control always clears us the same way -- down the ramp to runway 9L to runway 23R. As we approached runway 23R, I told my first officer to let the tower know we were ready for takeoff, at which time the tower stated they didn't know we had taxied yet. They asked me to give the tower a call when we arrived at ptk. I did and told them I was very sorry, and what had happened. I had a fairly new first officer. Usually before I taxi, I ask if it's clear on the right and the first officer calls for taxi clearance. It was my fault, I assumed the first officer had already called and we had been cleared to runway 23R, as I had heard him say runway 23R, while closing the door. There was no other traffic moving on the ground or landing while we taxied. The key word is 'assume.' don't ever assume anything. If you're not sure, ask questions.

Original NASA ASRS Text

Title: AN SMT CREW TAXIED TO TAKE OFF RWY AT YIP WITHOUT A CLRNC.

Narrative: MY COPLT WAS ALREADY IN THE COCKPIT. WHEN I FINISHED MY PREFLT, I SHUT THE LOAD DOOR. AS I WAS DOING SO, I COULD HEAR HIM TALKING TO GND CTL AT YIP. I HEARD HIM SAY 'CLRED TO RWY 23R.' WE RAN THE BEFORE AND START CHKLISTS. I STARTED BOTH ENGS AND STARTED MY TAXI. GND CTL ALWAYS CLRS US THE SAME WAY -- DOWN THE RAMP TO RWY 9L TO RWY 23R. AS WE APCHED RWY 23R, I TOLD MY FO TO LET THE TWR KNOW WE WERE READY FOR TKOF, AT WHICH TIME THE TWR STATED THEY DIDN'T KNOW WE HAD TAXIED YET. THEY ASKED ME TO GIVE THE TWR A CALL WHEN WE ARRIVED AT PTK. I DID AND TOLD THEM I WAS VERY SORRY, AND WHAT HAD HAPPENED. I HAD A FAIRLY NEW FO. USUALLY BEFORE I TAXI, I ASK IF IT'S CLR ON THE R AND THE FO CALLS FOR TAXI CLRNC. IT WAS MY FAULT, I ASSUMED THE FO HAD ALREADY CALLED AND WE HAD BEEN CLRED TO RWY 23R, AS I HAD HEARD HIM SAY RWY 23R, WHILE CLOSING THE DOOR. THERE WAS NO OTHER TFC MOVING ON THE GND OR LNDG WHILE WE TAXIED. THE KEY WORD IS 'ASSUME.' DON'T EVER ASSUME ANYTHING. IF YOU'RE NOT SURE, ASK QUESTIONS.

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.