Wingtip strike between 2 smas, departure taxiing traffic.

Attributes
ACN	347336
Time
Date	199609
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	ground : holding ground other : taxi
Flight Plan	None
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : holding ground other : taxi
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 600 flight time type : 90
ASRS Report	347336
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : ground less severe non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified
Airport	other physical facility

Narrative:

My beginning student and I were cleared by sna ground to taxi to runway 19L and hold short at taxiway K. Local procedure allows small aircraft taking off from the left runway to hold short on taxiway K with an offset to the left side of the taxiway centerline to allow traffic taxiing for the right runway to taxi on the right side of taxiway K and cross runway 19L to runway 19R. As we pulled up and held short of runway 19L I was lightly on the controls to assure that my student would not violate the hold short markings and to check that we would stop in a position with our right wingtip clearly to the left side of the taxiway centerline, and we did. I estimated the wing clearance to the taxiway line to be about 3-4 ft. As we were holding short we contacted sna tower on 119.9 and were instructed to hold short for landing traffic, so we acknowledged and held. While holding another aircraft, a C172 taxied up to hold short of runway 19L at taxiway K and offset to the right side of the taxiway centerline. We did not hear that aircraft on frequency and assumed they were talking to tower on 126.8. Tower then called us clear for takeoff on runway 19L. My student acknowledged the radio call first and then added power to straighten out parallel to the taxiway because we had purposely stopped at an angle to facilitate checking traffic on final approach. As we were rolling forward slowly I was looking out the right side continuously to check our right wingtip clearance with the C172, our wingtip remained on our side of the taxiway centerline at all times. I then observed the C172 begin to move forward and then turn to the left to parallel the taxiway. The C172 wingtip came from behind our wingtip and hit our wing and scraped along and I observed the pilot in the left seat of the C172 and his passenger both looking to the right to check for traffic on final. The other pilot never saw the collision and never acted as if he knew. No damage occurred to our airplane. Maybe the problem could be avoided by not having 2 airplanes side-by-side talking to 2 different controllers.

Original NASA ASRS Text

Title: WINGTIP STRIKE BTWN 2 SMAS, DEP TAXIING TFC.

Narrative: MY BEGINNING STUDENT AND I WERE CLRED BY SNA GND TO TAXI TO RWY 19L AND HOLD SHORT AT TXWY K. LCL PROC ALLOWS SMALL ACFT TAKING OFF FROM THE L RWY TO HOLD SHORT ON TXWY K WITH AN OFFSET TO THE L SIDE OF THE TXWY CTRLINE TO ALLOW TFC TAXIING FOR THE R RWY TO TAXI ON THE R SIDE OF TXWY K AND CROSS RWY 19L TO RWY 19R. AS WE PULLED UP AND HELD SHORT OF RWY 19L I WAS LIGHTLY ON THE CTLS TO ASSURE THAT MY STUDENT WOULD NOT VIOLATE THE HOLD SHORT MARKINGS AND TO CHK THAT WE WOULD STOP IN A POS WITH OUR R WINGTIP CLRLY TO THE L SIDE OF THE TXWY CTRLINE, AND WE DID. I ESTIMATED THE WING CLRNC TO THE TXWY LINE TO BE ABOUT 3-4 FT. AS WE WERE HOLDING SHORT WE CONTACTED SNA TWR ON 119.9 AND WERE INSTRUCTED TO HOLD SHORT FOR LNDG TFC, SO WE ACKNOWLEDGED AND HELD. WHILE HOLDING ANOTHER ACFT, A C172 TAXIED UP TO HOLD SHORT OF RWY 19L AT TXWY K AND OFFSET TO THE R SIDE OF THE TXWY CTRLINE. WE DID NOT HEAR THAT ACFT ON FREQ AND ASSUMED THEY WERE TALKING TO TWR ON 126.8. TWR THEN CALLED US CLR FOR TKOF ON RWY 19L. MY STUDENT ACKNOWLEDGED THE RADIO CALL FIRST AND THEN ADDED PWR TO STRAIGHTEN OUT PARALLEL TO THE TXWY BECAUSE WE HAD PURPOSELY STOPPED AT AN ANGLE TO FACILITATE CHKING TFC ON FINAL APCH. AS WE WERE ROLLING FORWARD SLOWLY I WAS LOOKING OUT THE R SIDE CONTINUOUSLY TO CHK OUR R WINGTIP CLRNC WITH THE C172, OUR WINGTIP REMAINED ON OUR SIDE OF THE TXWY CTRLINE AT ALL TIMES. I THEN OBSERVED THE C172 BEGIN TO MOVE FORWARD AND THEN TURN TO THE L TO PARALLEL THE TXWY. THE C172 WINGTIP CAME FROM BEHIND OUR WINGTIP AND HIT OUR WING AND SCRAPED ALONG AND I OBSERVED THE PLT IN THE L SEAT OF THE C172 AND HIS PAX BOTH LOOKING TO THE R TO CHK FOR TFC ON FINAL. THE OTHER PLT NEVER SAW THE COLLISION AND NEVER ACTED AS IF HE KNEW. NO DAMAGE OCCURRED TO OUR AIRPLANE. MAYBE THE PROB COULD BE AVOIDED BY NOT HAVING 2 AIRPLANES SIDE-BY-SIDE TALKING TO 2 DIFFERENT CTLRS.

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.