Narrative:

On aug/sat/02, I conducted a 1 hour introductory training flight with a first time student out of oakland airport. I received clearance from ground to taxi to runway 33 at intersection left and under my instruction my student taxied to the intersection and I performed the engine run-up. I contacted oakland tower and was asked if I would accept an intersection departure. When I declined I was instructed to back taxi down the runway and hold in position. I read back the back taxi instructions but do not recall whether I read back the position and hold instructions. We proceeded to back taxi with myself at the controls, and turned 180 degrees at the departure end of the runway and lined up with the centerline. I reviewed the takeoff procedure with my student, completed the before takeoff checklist, and instructed the student to commence the takeoff. When climbing through approximately 200 ft the tower announced that we were in radar contact and had traffic above us and to the left. Tower then informed me that I had departed without a takeoff clearance. I saw the other aircraft, possibly a small cessna, approximately 500 ft above us at my 10 O'clock position on a heading perpendicular to ours. I determined that no evasive action was necessary and continued with the climb. The traffic passed safely above us and we were handed off to departure and continued the flight. The cause of the incident was my misunderstanding of the position and hold clearance. I am accustomed to being cleared for takeoff at the same time I am cleared to back taxi from that particular intersection and simply heard what I expected to hear rather than the controller's actual instructions. I am a low time CFI with only 8 hours of dual instruction given and I feel that I allowed myself to become distracted by explaining the takeoff procedures to my student before and during the taxi back which probably contributed to missing the position and hold instructions. In order to avoid a similar mistake in the future I believe I should avoid unnecessary cockpit conversation at times when communication with ATC is critical. Readback of all elements of taxi, and takeoff clrncs should also help prevent me from committing the same error again.

Related reports:

Google
 

Original NASA ASRS Text

Title: A C172 INSTRUCTOR AND STUDENT, DEPARTING OAK, MISINTERPRETED THE HOLD IN POS INSTRUCTIONS AS BEING CLRED FOR TKOF CLRNC.

Narrative: ON AUG/SAT/02, I CONDUCTED A 1 HR INTRODUCTORY TRAINING FLT WITH A FIRST TIME STUDENT OUT OF OAKLAND ARPT. I RECEIVED CLRNC FROM GND TO TAXI TO RWY 33 AT INTXN L AND UNDER MY INSTRUCTION MY STUDENT TAXIED TO THE INTXN AND I PERFORMED THE ENG RUN-UP. I CONTACTED OAKLAND TWR AND WAS ASKED IF I WOULD ACCEPT AN INTXN DEP. WHEN I DECLINED I WAS INSTRUCTED TO BACK TAXI DOWN THE RWY AND HOLD IN POS. I READ BACK THE BACK TAXI INSTRUCTIONS BUT DO NOT RECALL WHETHER I READ BACK THE POS AND HOLD INSTRUCTIONS. WE PROCEEDED TO BACK TAXI WITH MYSELF AT THE CTLS, AND TURNED 180 DEGS AT THE DEP END OF THE RWY AND LINED UP WITH THE CTRLINE. I REVIEWED THE TKOF PROC WITH MY STUDENT, COMPLETED THE BEFORE TKOF CHKLIST, AND INSTRUCTED THE STUDENT TO COMMENCE THE TKOF. WHEN CLBING THROUGH APPROX 200 FT THE TWR ANNOUNCED THAT WE WERE IN RADAR CONTACT AND HAD TFC ABOVE US AND TO THE L. TWR THEN INFORMED ME THAT I HAD DEPARTED WITHOUT A TKOF CLRNC. I SAW THE OTHER ACFT, POSSIBLY A SMALL CESSNA, APPROX 500 FT ABOVE US AT MY 10 O'CLOCK POS ON A HEADING PERPENDICULAR TO OURS. I DETERMINED THAT NO EVASIVE ACTION WAS NECESSARY AND CONTINUED WITH THE CLB. THE TFC PASSED SAFELY ABOVE US AND WE WERE HANDED OFF TO DEP AND CONTINUED THE FLT. THE CAUSE OF THE INCIDENT WAS MY MISUNDERSTANDING OF THE POS AND HOLD CLRNC. I AM ACCUSTOMED TO BEING CLRED FOR TKOF AT THE SAME TIME I AM CLRED TO BACK TAXI FROM THAT PARTICULAR INTXN AND SIMPLY HEARD WHAT I EXPECTED TO HEAR RATHER THAN THE CTLR'S ACTUAL INSTRUCTIONS. I AM A LOW TIME CFI WITH ONLY 8 HRS OF DUAL INSTRUCTION GIVEN AND I FEEL THAT I ALLOWED MYSELF TO BECOME DISTRACTED BY EXPLAINING THE TKOF PROCS TO MY STUDENT BEFORE AND DURING THE TAXI BACK WHICH PROBABLY CONTRIBUTED TO MISSING THE POS AND HOLD INSTRUCTIONS. IN ORDER TO AVOID A SIMILAR MISTAKE IN THE FUTURE I BELIEVE I SHOULD AVOID UNNECESSARY COCKPIT CONVERSATION AT TIMES WHEN COM WITH ATC IS CRITICAL. READBACK OF ALL ELEMENTS OF TAXI, AND TKOF CLRNCS SHOULD ALSO HELP PREVENT ME FROM COMMITTING THE SAME ERROR AGAIN.

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.