Fokker 100 flight crew took without IFR route clearance. Departure controller requested that they squawk their assigned transponder code which they believed that they had done for takeoff.

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Attributes
ACN	500815
Time
Date	200102
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit.airport
State Reference	PA
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : pit.tracon
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : intermediate altitude climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : cfi pilot : flight engineer pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 4200
ASRS Report	500815
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 15600
ASRS Report	5009604000
Events
Anomaly	non adherence : far non adherence other
Independent Detector	other controllera
Resolutory Action	controller : issued alert other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight pit-ind. Took off without a clearance. Essentially, captain thought I had gotten clearance via pre departure clearance, and I thought he had gotten it. There was a crew change in pit, and the existing pre departure clearance on ACARS had the same initial routing as we had going to ind. On departure, the controller asked us to squawk the appropriate code. We replied we were squawking XXXX, thinking it was correct. It was not. Pulled up our clearance via pre departure clearance in-flight. Nothing further said.

Original NASA ASRS Text

Title: FOKKER 100 FLC TOOK WITHOUT IFR RTE CLRNC. DEP CTLR REQUESTED THAT THEY SQUAWK THEIR ASSIGNED XPONDER CODE WHICH THEY BELIEVED THAT THEY HAD DONE FOR TKOF.

Narrative: FLT PIT-IND. TOOK OFF WITHOUT A CLRNC. ESSENTIALLY, CAPT THOUGHT I HAD GOTTEN CLRNC VIA PDC, AND I THOUGHT HE HAD GOTTEN IT. THERE WAS A CREW CHANGE IN PIT, AND THE EXISTING PDC ON ACARS HAD THE SAME INITIAL ROUTING AS WE HAD GOING TO IND. ON DEP, THE CTLR ASKED US TO SQUAWK THE APPROPRIATE CODE. WE REPLIED WE WERE SQUAWKING XXXX, THINKING IT WAS CORRECT. IT WAS NOT. PULLED UP OUR CLRNC VIA PDC INFLT. NOTHING FURTHER SAID.

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.