Narrative:

Initial IFR clearance included northeast departure procedure. During taxi we requested a longer runway and were told to taxi to it. Prior to arriving at that runway, we got an amended northwest departure procedure. I reset the altitude alerter and changed the navigation radio frequency to dca 111.0 for the departure. The captain was familiar and set the outbound radial in his obs. After takeoff, tower said 'please turn transponder on, squawk XXXX.' my error. We complied and were then handed off to departure. Following contact with departure, we were told to turn left heading 290 degrees to avoid prohibited airspace. The captain turned immediately. Prior to the next handoff, we were given a phone number to call after landing. I later found out that ATC said we might have flown into P56 at the naval observatory. During a debriefing with the captain, he told me that he flew the 348 degree radial rather than the 328 degree radial in the departure procedure.

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Original NASA ASRS Text

Title: A CPR DA10 FLC DEPARTING FROM DCA RPTS A HASTY TKOF BRIEFING FOLLOWED BY AN INCURSION INTO P56.

Narrative: INITIAL IFR CLRNC INCLUDED NE DEP PROC. DURING TAXI WE REQUESTED A LONGER RWY AND WERE TOLD TO TAXI TO IT. PRIOR TO ARRIVING AT THAT RWY, WE GOT AN AMENDED NW DEP PROC. I RESET THE ALT ALERTER AND CHANGED THE NAV RADIO FREQ TO DCA 111.0 FOR THE DEP. THE CAPT WAS FAMILIAR AND SET THE OUTBOUND RADIAL IN HIS OBS. AFTER TKOF, TWR SAID 'PLEASE TURN XPONDER ON, SQUAWK XXXX.' MY ERROR. WE COMPLIED AND WERE THEN HANDED OFF TO DEP. FOLLOWING CONTACT WITH DEP, WE WERE TOLD TO TURN L HDG 290 DEGS TO AVOID PROHIBITED AIRSPACE. THE CAPT TURNED IMMEDIATELY. PRIOR TO THE NEXT HDOF, WE WERE GIVEN A PHONE NUMBER TO CALL AFTER LNDG. I LATER FOUND OUT THAT ATC SAID WE MIGHT HAVE FLOWN INTO P56 AT THE NAVAL OBSERVATORY. DURING A DEBRIEFING WITH THE CAPT, HE TOLD ME THAT HE FLEW THE 348 DEG RADIAL RATHER THAN THE 328 DEG RADIAL IN THE DEP PROC.

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.