NTSB Identification: CHI83LA025
14 CFR Part 91: General Aviation
Accident occurred Sunday, October 24, 1982 in LANSING, IL
Probable Cause Approval Date: 10/24/1983
Aircraft: CESSNA 172, registration: N23388
Injuries: 3 Minor,1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE ACFT HAD A COMPLETE ELECTRICAL FAILURE & THE PLT MADE AN EMERGENCY LANDING AT LANSING. THE PLT WAS UNABLE TO LOWER THE FLAP, & AFTER ENCOUNTERING GROUND FOG LANDED LONG, BOUNCED, & GROUND LOOPED TO AVOID RUNNING OFF THE END OF THE RWY.INVEST OF THE ELECT SYSTEM REVEALED THAT AN UNIDENTIFIABLE NOISE FILTER HAD BEEN INSTALLED IN THE LINE OF THE OUTPUT SIDE OF THE ALTERNATOR. TESTING REVEALED THAT THE NOISE FILTER DEVELOPED VOLTAGE SPIKES THAT COULD INCREASE LINE VOLTAGEMOMENTARILY TO 16 VOLTS. THE OVERVOLTAGE SENSOR WAS INOPERATIVE. THE SENSOR WAS PROBABLY TRIPPED BY EXCESSIVE SPIKING ON THE LINE VOLTAGE WHICH WOULD TURN OFF THE ALTERNATOR SYSTEM ILLUMINATING THE OVERVOLTAGE WARNING LIGHT. HOWEVER, THE BULB WAS FOUND BURNED OUT. THIS CONDITION CAN USUALLY BE CORRECTED BY RECYCLING THE MASTER SWITCH TO RESUME NORMAL ALTERNATING CHARGING.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ELECTRICAL SYSTEM..IMPROPER

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,MODIFICATION..IMPROPER..OTHER MAINTENANCE PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ELECTRICAL SYSTEM,VOLTAGE REGULATOR..POPPED/TRIPPED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ELECTRICAL SYSTEM..FAILURE,TOTAL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

GROUND LOOP/SWERVE..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

ANNUNCIATOR PANEL LIGHT(S)..INOPERATIVE


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

PRECAUTIONARY LANDING..PERFORMED..PILOT IN COMMAND


Contributing Factors

LOWERING OF FLAPS..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..FOG

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