Narrative:

While performing touch and go lndgs in left traffic, runway 6, at isp, on the takeoff leg, I noticed and realized that I was hearing no radio communications. I spoke to the student through the aircraft's intercom, which was also not working. I then realized that all radio lights were off and nothing electrical was working. The ammeter was reading discharge. This was a complete and sudden failure. While the student continued to fly the aircraft, I accomplished the checklist for electrical failure, including trying to reset the alternator. All electrical equipment was shut off and the student was instructed to fly the traffic pattern at traffic pattern altitude, and watch for other traffic. Remaining at traffic pattern altitude, I watched for visual signals from the tower. The student performed the electrical failure checklist again and one communication radio lights appeared on, although very dim. I called to the tower in the blind telling him we had an electrical failure and would like to land. The tower cleared us to land, which was acknowledge, although it was not known if we were received. The landing was uneventful. After shutdown, examination of the alternator belt appeared satisfactory. No smoke or odors were observed in the cowling, cockpit, or near the battery. The aircraft was later ferried to frg airport after receiving an auxiliary jump start, and turned over to the operator for maintenance. Conversations with the controllers at isp tower indicated that this incident caused no problems. They, in my opinion, handled the situation very professionally. At this time, I do not know the results of the maintenance findings. Thank you. This is a great program.

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Original NASA ASRS Text

Title: PRIMARY ELECTRICAL PWR SUPPLY PROB.

Narrative: WHILE PERFORMING TOUCH AND GO LNDGS IN L TFC, RWY 6, AT ISP, ON THE TKOF LEG, I NOTICED AND REALIZED THAT I WAS HEARING NO RADIO COMS. I SPOKE TO THE STUDENT THROUGH THE ACFT'S INTERCOM, WHICH WAS ALSO NOT WORKING. I THEN REALIZED THAT ALL RADIO LIGHTS WERE OFF AND NOTHING ELECTRICAL WAS WORKING. THE AMMETER WAS READING DISCHARGE. THIS WAS A COMPLETE AND SUDDEN FAILURE. WHILE THE STUDENT CONTINUED TO FLY THE ACFT, I ACCOMPLISHED THE CHKLIST FOR ELECTRICAL FAILURE, INCLUDING TRYING TO RESET THE ALTERNATOR. ALL ELECTRICAL EQUIP WAS SHUT OFF AND THE STUDENT WAS INSTRUCTED TO FLY THE TFC PATTERN AT TFC PATTERN ALT, AND WATCH FOR OTHER TFC. REMAINING AT TFC PATTERN ALT, I WATCHED FOR VISUAL SIGNALS FROM THE TWR. THE STUDENT PERFORMED THE ELECTRICAL FAILURE CHKLIST AGAIN AND ONE COM RADIO LIGHTS APPEARED ON, ALTHOUGH VERY DIM. I CALLED TO THE TWR IN THE BLIND TELLING HIM WE HAD AN ELECTRICAL FAILURE AND WOULD LIKE TO LAND. THE TWR CLRED US TO LAND, WHICH WAS ACKNOWLEDGE, ALTHOUGH IT WAS NOT KNOWN IF WE WERE RECEIVED. THE LNDG WAS UNEVENTFUL. AFTER SHUTDOWN, EXAMINATION OF THE ALTERNATOR BELT APPEARED SATISFACTORY. NO SMOKE OR ODORS WERE OBSERVED IN THE COWLING, COCKPIT, OR NEAR THE BATTERY. THE ACFT WAS LATER FERRIED TO FRG ARPT AFTER RECEIVING AN AUX JUMP START, AND TURNED OVER TO THE OPERATOR FOR MAINT. CONVERSATIONS WITH THE CTLRS AT ISP TWR INDICATED THAT THIS INCIDENT CAUSED NO PROBS. THEY, IN MY OPINION, HANDLED THE SIT VERY PROFESSIONALLY. AT THIS TIME, I DO NOT KNOW THE RESULTS OF THE MAINT FINDINGS. THANK YOU. THIS IS A GREAT PROGRAM.

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.