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A C172 on descent experienced a complete loss of electrical power due to a faulty voltage regulator requiring tower light signals to land.
| Attributes | |
| ACN | 375363 |
| Time | |
| Date | 199707 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : azo |
| State Reference | MI |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : azo |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach descent other landing other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Experience | flight time last 90 days : 15 flight time total : 240 flight time type : 240 |
| ASRS Report | 375363 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Loss of electrical system in C172 while northwest of kazo. Commenced troubleshooting while clear of class D airspace. Reset alternator: problem recurred. Communications never re- established. Squawked loss of communications on transponder. Tried to re-establish communications. Announced intentions to land. Overflew runway, made left traffic on downwind, received light gun signals (cleared to land) from kazo tower. Landed safely. Callback conversation with reporter revealed the following information: reporter states the loss of electrical power was caused by a defective voltage regulator which was just replaced. The reporter was advised by the FBO that they received several regulators from the manufacturer and all were bad. The FAA did not contact the reporter.
Original NASA ASRS Text
Title: A C172 ON DSCNT EXPERIENCED A COMPLETE LOSS OF ELECTRICAL PWR DUE TO A FAULTY VOLTAGE REGULATOR REQUIRING TWR LIGHT SIGNALS TO LAND.
Narrative: LOSS OF ELECTRICAL SYS IN C172 WHILE NW OF KAZO. COMMENCED TROUBLESHOOTING WHILE CLR OF CLASS D AIRSPACE. RESET ALTERNATOR: PROB RECURRED. COMS NEVER RE- ESTABLISHED. SQUAWKED LOSS OF COMS ON XPONDER. TRIED TO RE-ESTABLISH COMS. ANNOUNCED INTENTIONS TO LAND. OVERFLEW RWY, MADE L TFC ON DOWNWIND, RECEIVED LIGHT GUN SIGNALS (CLRED TO LAND) FROM KAZO TWR. LANDED SAFELY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE LOSS OF ELECTRICAL PWR WAS CAUSED BY A DEFECTIVE VOLTAGE REGULATOR WHICH WAS JUST REPLACED. THE RPTR WAS ADVISED BY THE FBO THAT THEY RECEIVED SEVERAL REGULATORS FROM THE MANUFACTURER AND ALL WERE BAD. THE FAA DID NOT CONTACT THE RPTR.
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.