SCT CTLR EXPRESSED CONCERN REGARDING FLT CREW BEHAVIOR DURING RADIO EQUIP PROBS.

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THE PA44 WAS ENRTE ON HIS OWN NAV; APPROX 15 MI INTO AN IFR TRAINING FLT FROM LGB TO RAL WHEN I OBSERVED THE XPONDER CHANGE TO HIJACK. I ASKED THE PLT TO VERIFY SQUAWKING THE HIJACK CODE AND HE ONLY RESPONDED 'AFFIRMATIVE.' MY SUPVR IMMEDIATELY NOTIFIED THE OPS MGR AND THE APPROPRIATE AUTHS STARTED TO BE NOTIFIED. SHORTLY THEREAFTER; THE PLT STATED THAT HE HAD EXPERIENCED A COMPLETE ELECTRICAL FAILURE. WE CALLED OFF THE F18'S AND TRIED TO ASSIST THE PLT AND GET HIS INTENTIONS; BUT WERE UNABLE TO REESTABLISH RADIO CONTACT. THE MODE C FAILED; THE ACFT STARTED TO DEVIATE FROM HIS RTE OF FLT. THERE WAS SOME CONCERN AS THE ACFT WAS OVERFLYING THE TFR OVER DISNEYLAND; BUT WE FELT CERTAIN THAT THE PLT WAS MISTAKENLY SQUAWKING THE HIJACK CODE INSTEAD OF THE LOST RADIO CODE. THE ACFT WAS EVENTUALLY ABLE TO REGAIN RADIO COM AND CONTINUED TO HIS DEST ARPT. WHEN THE PLT (INSTRUCTOR) CALLED THE FACILITY; HE EXPLAINED THAT THE STUDENT HAD MISTAKENLY TURNED OFF THE ALTERNATOR PRIOR TO TKOF. WHEN HE LOST ELECTRICAL PWR; THE STUDENT THEN MISTAKENLY SQUAWKED THE WRONG XPONDER CODE. THE PLT WALKED AWAY WITH A HAND SLAP. I WALKED AWAY WITH A FEW MORE GREY HAIRS! I BELIEVE AN INCIDENT AS CRITICAL AS THIS NEEDS TO BE ADDRESSED MORE SERIOUSLY. HAD THE PLT NOT BEEN ABLE TO COMMUNICATE HIS ELECTRICAL PROB TO ATC; HE VERY WELL COULD HAVE BEEN INTERCEPTED DUE TO THE ERRONEOUS XPONDER CODE; TURN OFF RTE OF FLT; OUR LOSS OF MODE C; AND HIS PROX TO A TFR IN WAR TIME. THE INSTRUCTOR SHOULD HAVE; AT THE VERY LEAST; BEEN MADE TO FILL OUT HIS OWN NASA RPT!