|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : oak|
|Altitude||msl bound lower : 2000|
msl bound upper : 2000
|Controlling Facilities||tracon : oak|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : instrument|
pilot : cfi
pilot : commercial
|Experience||flight time last 90 days : 34|
flight time total : 400
flight time type : 30
|Affiliation||government : faa|
|Function||controller : approach|
|Qualification||controller : radar|
|Anomaly||aircraft equipment problem : critical|
other anomaly other
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
other flight crewa
|Resolutory Action||flight crew : overcame equipment problem|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
When I was on a traffic watch flight circling above toll plaza bay bridge at 2000 ft MSL, I lost my electrical power. The last thing I heard was the ATC announcing that he lost my transponder. When I tried to respond the radio totally died. At this point, I looked at the ammeter and saw that the needle was just a little bit off to the negative side. I touched the low voltage and it illuminates. During this time I decided to leave the class C airspace to the northeast because of lost radio communications with the ATC. While leaving the class C airspace I started to trouble-shoot. I turned off all electrical equipment and recycled the master switch. The ammeter showed a strong positive load and the low voltage light goes off. To be on the safe side I decided to fly back to hayward airport and land. I turned on the radios just outside the class D airspace and picked up the ATIS and talked with the tower and landed. What I missed on my runup was to recycle the alternator switch and to check the ammeter properly. So by following the checklist and not letting any private problems interfere with the flying, a problem like this should not occur again.
Original NASA ASRS Text
Title: TFC WATCH ACFT HAS ELECTRICAL PROB. LOST COM.
Narrative: WHEN I WAS ON A TFC WATCH FLT CIRCLING ABOVE TOLL PLAZA BAY BRIDGE AT 2000 FT MSL, I LOST MY ELECTRICAL PWR. THE LAST THING I HEARD WAS THE ATC ANNOUNCING THAT HE LOST MY XPONDER. WHEN I TRIED TO RESPOND THE RADIO TOTALLY DIED. AT THIS POINT, I LOOKED AT THE AMMETER AND SAW THAT THE NEEDLE WAS JUST A LITTLE BIT OFF TO THE NEGATIVE SIDE. I TOUCHED THE LOW VOLTAGE AND IT ILLUMINATES. DURING THIS TIME I DECIDED TO LEAVE THE CLASS C AIRSPACE TO THE NE BECAUSE OF LOST RADIO COMS WITH THE ATC. WHILE LEAVING THE CLASS C AIRSPACE I STARTED TO TROUBLE-SHOOT. I TURNED OFF ALL ELECTRICAL EQUIP AND RECYCLED THE MASTER SWITCH. THE AMMETER SHOWED A STRONG POSITIVE LOAD AND THE LOW VOLTAGE LIGHT GOES OFF. TO BE ON THE SAFE SIDE I DECIDED TO FLY BACK TO HAYWARD ARPT AND LAND. I TURNED ON THE RADIOS JUST OUTSIDE THE CLASS D AIRSPACE AND PICKED UP THE ATIS AND TALKED WITH THE TWR AND LANDED. WHAT I MISSED ON MY RUNUP WAS TO RECYCLE THE ALTERNATOR SWITCH AND TO CHK THE AMMETER PROPERLY. SO BY FOLLOWING THE CHKLIST AND NOT LETTING ANY PRIVATE PROBS INTERFERE WITH THE FLYING, A PROB LIKE THIS SHOULD NOT OCCUR AGAIN.
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.