Unauthorized uncoord penetration of class C airspace by a C172. Training in progress. Instructor pilot had declined approach controller's offer of radar monitoring flight following.

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Attributes
ACN	354390
Time
Date	199612
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	agl bound lower : 1100 agl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tower : ewr
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other cruise other
Route In Use	approach : visual enroute other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 5 flight time total : 600
ASRS Report	354390
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
Events
Anomaly	non adherence : far other anomaly other other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was maneuvering west of sna just outside the air traffic area class C and below the overlying class C airspace demonstrating ground reference maneuvers to a student pilot. I advised socal approach of my intentions, however, I declined flight following, confident that I would remain outside the class C airspace. After completion of our maneuvers I contacted socal approach for clearance back to sna airport. At that time the same controller responded and advised me that I inadvertently penetrated the class C airspace without clearance. I felt we were outside the class C airspace for this period. As you know, airspace in southern california is very congested, leaving few areas to perform this type of airwork. I suggest a more detailed chart when in close vicinities to airports (other than TCA) which may prevent inadvertent penetrations of this type. Also, charted practice areas may help. Most of all, however, encourage pilots to take advantage of our ATC system which will avoid this problem all together.

Original NASA ASRS Text

Title: UNAUTH UNCOORD PENETRATION OF CLASS C AIRSPACE BY A C172. TRAINING IN PROGRESS. INSTRUCTOR PLT HAD DECLINED APCH CTLR'S OFFER OF RADAR MONITORING FLT FOLLOWING.

Narrative: I WAS MANEUVERING W OF SNA JUST OUTSIDE THE ATA CLASS C AND BELOW THE OVERLYING CLASS C AIRSPACE DEMONSTRATING GND REF MANEUVERS TO A STUDENT PLT. I ADVISED SOCAL APCH OF MY INTENTIONS, HOWEVER, I DECLINED FLT FOLLOWING, CONFIDENT THAT I WOULD REMAIN OUTSIDE THE CLASS C AIRSPACE. AFTER COMPLETION OF OUR MANEUVERS I CONTACTED SOCAL APCH FOR CLRNC BACK TO SNA ARPT. AT THAT TIME THE SAME CTLR RESPONDED AND ADVISED ME THAT I INADVERTENTLY PENETRATED THE CLASS C AIRSPACE WITHOUT CLRNC. I FELT WE WERE OUTSIDE THE CLASS C AIRSPACE FOR THIS PERIOD. AS YOU KNOW, AIRSPACE IN SOUTHERN CALIFORNIA IS VERY CONGESTED, LEAVING FEW AREAS TO PERFORM THIS TYPE OF AIRWORK. I SUGGEST A MORE DETAILED CHART WHEN IN CLOSE VICINITIES TO ARPTS (OTHER THAN TCA) WHICH MAY PREVENT INADVERTENT PENETRATIONS OF THIS TYPE. ALSO, CHARTED PRACTICE AREAS MAY HELP. MOST OF ALL, HOWEVER, ENCOURAGE PLTS TO TAKE ADVANTAGE OF OUR ATC SYS WHICH WILL AVOID THIS PROB ALL TOGETHER.

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.