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A C172 pilot had an aircraft equipment problem alternator failure which did not let him transmit in the roc traffic pattern. Training in progress. Unable to establish radio contact.
| Attributes | |
| ACN | 347221 |
| Time | |
| Date | 199608 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : roc |
| State Reference | NY |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : roc |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 56 flight time total : 348 flight time type : 10 |
| ASRS Report | 347221 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : provided flight assist other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Flying back in from our practice area, I contacted roc approach prior to entering the class C airspace. I stated my intentions and position. I was given a squawk code. Approximately 5 mi from airport, I tried communicating with approach, with no reply. The indicator light on the transponder was very, very weak. I flew in 1000 ft above tpa, flew to airport, and circled north of the field. I could still hear communications on radio but could not transmit. I heard tower declare an emergency and cleared the field of all aircraft. I saw the emergency trucks and end of runway 4/22. I was waiting for light gun signal, but never received it. After one 360 degree turn at standard rate, I decided to land so as not to hold up other aircraft. At this point, other aircraft were reporting my position to tower. I landed without incident on runway 25. It was determined afterward that the alternator had failed.
Original NASA ASRS Text
Title: A C172 PLT HAD AN ACFT EQUIP PROB ALTERNATOR FAILURE WHICH DID NOT LET HIM XMIT IN THE ROC TFC PATTERN. TRAINING IN PROGRESS. UNABLE TO ESTABLISH RADIO CONTACT.
Narrative: FLYING BACK IN FROM OUR PRACTICE AREA, I CONTACTED ROC APCH PRIOR TO ENTERING THE CLASS C AIRSPACE. I STATED MY INTENTIONS AND POS. I WAS GIVEN A SQUAWK CODE. APPROX 5 MI FROM ARPT, I TRIED COMMUNICATING WITH APCH, WITH NO REPLY. THE INDICATOR LIGHT ON THE XPONDER WAS VERY, VERY WEAK. I FLEW IN 1000 FT ABOVE TPA, FLEW TO ARPT, AND CIRCLED N OF THE FIELD. I COULD STILL HEAR COMS ON RADIO BUT COULD NOT XMIT. I HEARD TWR DECLARE AN EMER AND CLRED THE FIELD OF ALL ACFT. I SAW THE EMER TRUCKS AND END OF RWY 4/22. I WAS WAITING FOR LIGHT GUN SIGNAL, BUT NEVER RECEIVED IT. AFTER ONE 360 DEG TURN AT STANDARD RATE, I DECIDED TO LAND SO AS NOT TO HOLD UP OTHER ACFT. AT THIS POINT, OTHER ACFT WERE RPTING MY POS TO TWR. I LANDED WITHOUT INCIDENT ON RWY 25. IT WAS DETERMINED AFTERWARD THAT THE ALTERNATOR HAD FAILED.
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.