A C172 INSTRUCTOR AND STUDENT VIOLATED LAX CLASS B AIRSPACE WHILE PERFORMING TRAINING MANEUVERS.

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AT FIRST I WAS VERY VIGILANT ABOUT MAINTAINING OUR POS BELOW THE BOTTOM SHELF OF LOS ANGELES CLASS B AIRSPACE; WHICH WAS 5000 FT MSL. ALSO; WE WERE IN CONSTANT CONTACT WITH SOCAL APCH RECEIVING TA'S. NEARING THE END OF THE FLT; I HAD MY STUDENT CLOSE HIS EYES AND CONTINUE FLYING THE ACFT AS I CALLED OUT VARIOUS INSTRUCTIONS; IE; TURN L; TURN R; CLB; DSND. THE PURPOSE WAS TO ENSURE THE ONSET OF VERTIGO IN THE STUDENT. WE EVENTUALLY DEVELOPED A SIGNIFICANT CLBING AND TURNING UNUSUAL ATTITUDE AND JUST BEFORE THE ONSET OF A STALL; I INSTRUCTED THE STUDENT TO RECOVER. HE DID SO EFFECTIVELY; BUT A FEW SECONDS LATER SOCAL GAVE US A CALLOUT ASKING FOR OUR ALT. I KNEW IMMEDIATELY WE HAD BREACHED THE BOTTOM SHELF OF LAX CLASS B AIRSPACE. THE CTLR; ALTHOUGH QUICK TO ALERT US TO OUR TRANSGRESSION OF HIS AIRSPACE; WAS NOT OVERLY HARSH IN HIS RESPONSE. HE OFFERED TO COORD A CLASS B CLRNC FOR US AND ADMONISHED US TO BE CAREFUL OF THE CLASS B PARAMETERS IN THAT AREA. WE IMMEDIATELY DSNDED BELOW 5000 FT MSL AND RETURNED TO OUR HOME ARPT. I DISCUSSED THE INCIDENT WITH MY STUDENT UPON OUR RETURN TO HAWTHORNE ARPT AND TOLD HIM THAT I HAD ALLOWED MY AWARENESS OF OUR POS IN RELATION TO THE CLASS B AIRSPACE TO SLIP WHILE WE WERE EXECUTING THE FINAL SERIES OF UNUSUAL ATTITUDES. I TOLD HIM WHY I HAD HIM PERFORM THE UNUSUAL ATTITUDES OVER LAND RATHER THAN OVER THE WATER; WHICH WAS DUE TO MY CONCERN OF THE POSSIBILITY OF VERTIGO AT NIGHT OVER WATER. I USED THE INCIDENT TO EXPLAIN TO MY STUDENT THE NASA ASRS RPTING SYS AND THE PURPOSE BEHIND IT; AND TOLD HIM THAT I WOULD BE FILING A RPT AS A RESULT OF OUR EXPERIENCE.