MD80 flight crew experiences multiple right electrical system powered anomalies just prior to descen...

Attributes
ACN	788388
Time
Date	200805
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	788388
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	788623
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : warning systems other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Just prior to descent; we got a warning for flap overspeed and then numerous other warnings. The autoplt and autothrottles failed. The first officer's instruments failed and we could hear switching noises in the circuit breaker panel. A check of the electrical panel showed normal volts and frequencys for both generators and there was no steady warning light on. There were numerous warnings; both aural and visual; going off continuously. We declared an emergency and began our descent into ZZZ. The aircraft configured normally and we flew an ILS approach. After landing; we shut down the right engine and the warnings ended. Callback conversation with reporter revealed the following information: the captain advised the problem was diagnosed as a single phase (of three) failure of the right generator. Voltage and frequency remained normal because they are not sensed from the failed phase. Reporter advised they elected not to communicate with company maintenance because doing so would have required leaving ATC on the one working communication radio and because landing was imminent.

Original NASA ASRS Text

Title: MD80 FLT CREW EXPERIENCES MULTIPLE RIGHT ELECTRICAL SYSTEM POWERED ANOMALIES JUST PRIOR TO DESCENT. DECLARE EMERGENCY AND LAND AT DESTINATION IN VMC. ANOMALY WARNINGS CEASE WHEN RIGHT ENGINE IS SHUT DOWN.

Narrative: JUST PRIOR TO DSCNT; WE GOT A WARNING FOR FLAP OVERSPEED AND THEN NUMEROUS OTHER WARNINGS. THE AUTOPLT AND AUTOTHROTTLES FAILED. THE FO'S INSTS FAILED AND WE COULD HEAR SWITCHING NOISES IN THE CIRCUIT BREAKER PANEL. A CHK OF THE ELECTRICAL PANEL SHOWED NORMAL VOLTS AND FREQS FOR BOTH GENERATORS AND THERE WAS NO STEADY WARNING LIGHT ON. THERE WERE NUMEROUS WARNINGS; BOTH AURAL AND VISUAL; GOING OFF CONTINUOUSLY. WE DECLARED AN EMER AND BEGAN OUR DSCNT INTO ZZZ. THE ACFT CONFIGURED NORMALLY AND WE FLEW AN ILS APCH. AFTER LNDG; WE SHUT DOWN THE R ENG AND THE WARNINGS ENDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPTAIN ADVISED THE PROBLEM WAS DIAGNOSED AS A SINGLE PHASE (OF THREE) FAILURE OF THE RIGHT GENERATOR. VOLTAGE AND FREQUENCY REMAINED NORMAL BECAUSE THEY ARE NOT SENSED FROM THE FAILED PHASE. REPORTER ADVISED THEY ELECTED NOT TO COMMUNICATE WITH COMPANY MAINT BECAUSE DOING SO WOULD HAVE REQUIRED LEAVING ATC ON THE ONE WORKING COM RADIO AND BECAUSE LNDG WAS IMMINENT.

Data retrieved from NASA's ASRS site as of May 2009 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.

MD80 flight crew experiences multiple right electrical system powered anomalies just prior to descent. Declare emergency and land at destination in VMC. Anomaly warnings cease when right engine is shut down.