Narrative:

I was not actually in the aircraft. I was observing from the FBO parking area approximately 300 yards from the incident. My information comes from: 1) visual observation, 2) talking with my student (who was soloing at the time), and 3) talking to a controller after the incident. Student and I flew from eul to boi to allow student to practice solo takeoff and lndgs at a controled field. Student and I had flown into boi on 2 prior occasions and performed takeoff/landing operations while dual, and the student had done well. Student flew us in to boi and dropped me off at the FBO. Student then performed 2 takeoff/lndgs on runway 28R with no trouble. On the 3RD landing, tower asked him to land on runway 28L, which he did. Student exited runway 28L at taxiway D, and held short of runway 28R. At this point a 'stuck microphone' situation occurred with another aircraft and student was having trouble communicating with the tower. Tower then showed student a flashing green light and as student started to taxi, he could see a B737 on final for runway 28R, he could not accurately judge its distance and became concerned that maybe the light signal was not for him and that he was going to cause an accident. So, he (wisely in my opinion) stopped and held short of runway 28R. Tower then (also wisely in my opinion, due to lack of 2-WAY communications) was not sure of student's intentions so they issued a go around to the B737. Communications were then restored, and tower ('sternly' according to student) told student to cross runway 28R and proceed to parking. Student was quite apprehensive at this point, and turned right onto runway 28R thinking that it was the taxiway. He realized his mistake as soon as he was lined up on the runway, and decided it would take more time to turn around and taxi off at taxiway D. So, he continued and exited at taxiway C. By this time tower was quite upset, and student apologized and repeated that he was a student pilot. When student parked, he explained the situation to me and I called the tower to talk over what had happened with them. I feel that contributing factors were: student pilot inexperience, stuck microphone situation on airport, light signals, proximity of landing traffic. Corrective actions will include additional instruction on unusual sits (light signals, stuck microphone) and operations at busy, controled airports.

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Original NASA ASRS Text

Title: A CFI, MONITORING HIS SOLO STUDENT DOING TOUCH AND GOES AT BOI, WATCHED HELPLESSLY AS HIS STUDENT ENTERED RWY 28R WITHOUT PERMISSION, AFTER BECOMING FLUSTERED BY ANOTHER ACFT'S STUCK MIKE AND THE STERNNESS OF BOI TWR'S INSTRUCTIONS.

Narrative: I WAS NOT ACTUALLY IN THE ACFT. I WAS OBSERVING FROM THE FBO PARKING AREA APPROX 300 YARDS FROM THE INCIDENT. MY INFO COMES FROM: 1) VISUAL OBSERVATION, 2) TALKING WITH MY STUDENT (WHO WAS SOLOING AT THE TIME), AND 3) TALKING TO A CTLR AFTER THE INCIDENT. STUDENT AND I FLEW FROM EUL TO BOI TO ALLOW STUDENT TO PRACTICE SOLO TKOF AND LNDGS AT A CTLED FIELD. STUDENT AND I HAD FLOWN INTO BOI ON 2 PRIOR OCCASIONS AND PERFORMED TKOF/LNDG OPS WHILE DUAL, AND THE STUDENT HAD DONE WELL. STUDENT FLEW US IN TO BOI AND DROPPED ME OFF AT THE FBO. STUDENT THEN PERFORMED 2 TKOF/LNDGS ON RWY 28R WITH NO TROUBLE. ON THE 3RD LNDG, TWR ASKED HIM TO LAND ON RWY 28L, WHICH HE DID. STUDENT EXITED RWY 28L AT TXWY D, AND HELD SHORT OF RWY 28R. AT THIS POINT A 'STUCK MIKE' SIT OCCURRED WITH ANOTHER ACFT AND STUDENT WAS HAVING TROUBLE COMMUNICATING WITH THE TWR. TWR THEN SHOWED STUDENT A FLASHING GREEN LIGHT AND AS STUDENT STARTED TO TAXI, HE COULD SEE A B737 ON FINAL FOR RWY 28R, HE COULD NOT ACCURATELY JUDGE ITS DISTANCE AND BECAME CONCERNED THAT MAYBE THE LIGHT SIGNAL WAS NOT FOR HIM AND THAT HE WAS GOING TO CAUSE AN ACCIDENT. SO, HE (WISELY IN MY OPINION) STOPPED AND HELD SHORT OF RWY 28R. TWR THEN (ALSO WISELY IN MY OPINION, DUE TO LACK OF 2-WAY COMS) WAS NOT SURE OF STUDENT'S INTENTIONS SO THEY ISSUED A GAR TO THE B737. COMS WERE THEN RESTORED, AND TWR ('STERNLY' ACCORDING TO STUDENT) TOLD STUDENT TO CROSS RWY 28R AND PROCEED TO PARKING. STUDENT WAS QUITE APPREHENSIVE AT THIS POINT, AND TURNED R ONTO RWY 28R THINKING THAT IT WAS THE TXWY. HE REALIZED HIS MISTAKE AS SOON AS HE WAS LINED UP ON THE RWY, AND DECIDED IT WOULD TAKE MORE TIME TO TURN AROUND AND TAXI OFF AT TXWY D. SO, HE CONTINUED AND EXITED AT TXWY C. BY THIS TIME TWR WAS QUITE UPSET, AND STUDENT APOLOGIZED AND REPEATED THAT HE WAS A STUDENT PLT. WHEN STUDENT PARKED, HE EXPLAINED THE SIT TO ME AND I CALLED THE TWR TO TALK OVER WHAT HAD HAPPENED WITH THEM. I FEEL THAT CONTRIBUTING FACTORS WERE: STUDENT PLT INEXPERIENCE, STUCK MIKE SIT ON ARPT, LIGHT SIGNALS, PROX OF LNDG TFC. CORRECTIVE ACTIONS WILL INCLUDE ADDITIONAL INSTRUCTION ON UNUSUAL SITS (LIGHT SIGNALS, STUCK MIKE) AND OPS AT BUSY, CTLED ARPTS.

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.