Pilot suffered loss of all electric including radios. Pilot landed on green light from tower.

Attributes
ACN	278709
Time
Date	199407
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bed
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bed
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 40000 flight time type : 5000
ASRS Report	278709
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other controllera other other : unspecified cockpit
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On flight to hanscom field, ma (VFR) in a cessna 172, my alternator was inoperative with all radios, lights, strobes, etc. My battery weakened. Upon reaching hanscom field, I circled and rocked my wings and received a green light to land. The FBO pulled my battery for charging, indicating that I had an alternator problem. Next morning I took off for home base at frc, long island, arriving safely. However, the alternator seemed to operate intermittently. Alternator was removed and a broken wire was repaired.

Original NASA ASRS Text

Title: PLT SUFFERED LOSS OF ALL ELECTRIC INCLUDING RADIOS. PLT LANDED ON GREEN LIGHT FROM TWR.

Narrative: ON FLT TO HANSCOM FIELD, MA (VFR) IN A CESSNA 172, MY ALTERNATOR WAS INOP WITH ALL RADIOS, LIGHTS, STROBES, ETC. MY BATTERY WEAKENED. UPON REACHING HANSCOM FIELD, I CIRCLED AND ROCKED MY WINGS AND RECEIVED A GREEN LIGHT TO LAND. THE FBO PULLED MY BATTERY FOR CHARGING, INDICATING THAT I HAD AN ALTERNATOR PROB. NEXT MORNING I TOOK OFF FOR HOME BASE AT FRC, LONG ISLAND, ARRIVING SAFELY. HOWEVER, THE ALTERNATOR SEEMED TO OPERATE INTERMITTENTLY. ALTERNATOR WAS REMOVED AND A BROKEN WIRE WAS REPAIRED.

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.