C172 INSTRUCTOR PLT AND STUDENT DELAYED SQUAWKING THE ASSIGNED CODE PRIOR TO ENTERING DC ADIZ.

Narrative

I WAS ON A VFR PVT PLT TRAINING FLT. I WAS THE CFI AND MY STUDENT WAS ON FLT #2 OF THE SYLLABUS. RETURNING TO QUANTICO (NYG) AFTER AN UNEVENTFUL LESSON; I INSTRUCTED THE STUDENT TO ESTABLISH COM WITH THE TWR. WE HAD AN ADIZ FLT PLAN ON FILE; AND THE CTLR GAVE US THE ARPT INFO AND WE WERE TOLD TO SQUAWK XXXX AND RPT 'SHIP'S GRAVEYARD;' A LCL RPTING POINT. I WROTE DOWN THE INFO; AND HAD MY STUDENT READ BACK. I THEN TOLD HIM TO DSND FROM 3000 FT TO REACH SHIP'S GRAVEYARD AT 1500 FT (MSL). I THEN POINTED OUT OUR HIGH GND SPD (147 KTS) ON THE GPS; DUE TO HIGH TAILWINDS. A COUPLE MI S OF SHIP'S GRAVEYARD; I RECOGNIZED THAT I HAD GOTTEN SIDE-TRACKED; AND HAD NOT YET SET IN THE CODE. I DID IMMEDIATELY. SHORTLY AFTER; TWR ASKED OUR POS AND SAID WE WERE SQUAWKING 1200. I TOLD HIM I HAD JUST RESET IT. THE PROB AROSE FROM MY INATTENTION (DUE TO INSTRUCTING); AND NOT COMPLETING THE TASK BEFORE GOING ON TO ANOTHER. A FACTOR WAS; THAT I WAS INSTRUCTING A NEW STUDENT ON SECOND FLT; AND TRYING TO GET HIM COMFORTABLE ON THE RADIO. ANOTHER FACTOR WAS HIGH TAILWIND RESULTING IN HIGHER THAN NORMAL GND SPD. I DON'T THINK THE SIT WOULD HAVE OCCURRED IF I WAS HANDLING THE RADIOS MYSELF. I WOULD HAVE SET THE CODE RIGHT AWAY INSTEAD OF WRITING IT DOWN FOR THE STUDENT TO READ BACK. CORRECTIVE ACTON: I WILL ENSURE; AND STRESS TO MY STUDENTS THAT THEY NEED TO HAVE THE 3 THINGS BEFORE ENTERING THE ADIZ: FLT PLAN ON FILE; COM WITH ATC; AND A SQUAWK CODE IN THE XPONDER.