An air carrier light transport reports an aircraft equipment problem massive electrical failure that caused all aural warnings to sound, the loss of the landing gear down indication and intercom as well as a temporary loss of radio communication. Emergency declared but probably not acknowledged due to communication failure.

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Attributes
ACN	345645
Time
Date	199608
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 700 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : cvg tower : cvg
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing : go around other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 260 flight time total : 3300 flight time type : 2300
ASRS Report	345645
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 11000 flight time type : 6000
ASRS Report	345631
Events
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 flight crew : declared emergency flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

A massive electrical failure caused activation of all aural warnings (terrain, too low, flaps, pull up ---) as well as loss of landing gear indications. We initiated a go around, but crew communication was interrupted due to loss of intercom. Upon climb out, gear selector lever was locked down, could not raise gear. We requested vectors for another approach and priority landing. Communication was limited to #1 radio and there was confusion with ATC due to another aircraft with similar call sign blocking and answering our calls. Captain declared emergency but evidently was not heard due to radio failure. We received priority to land and landed uneventfully. Our call sign was aacc, other aircraft's call sign was abcc. Supplemental information from acn 345631: we finally figured out that, with communication #1 selected, we were transmitting on communication #2 and at this point we regained communication with departure control.

Original NASA ASRS Text

Title: AN ACR LTT RPTS AN ACFT EQUIP PROB MASSIVE ELECTRICAL FAILURE THAT CAUSED ALL AURAL WARNINGS TO SOUND, THE LOSS OF THE LNDG GEAR DOWN INDICATION AND INTERCOM AS WELL AS A TEMPORARY LOSS OF RADIO COM. EMER DECLARED BUT PROBABLY NOT ACKNOWLEDGED DUE TO COM FAILURE.

Narrative: A MASSIVE ELECTRICAL FAILURE CAUSED ACTIVATION OF ALL AURAL WARNINGS (TERRAIN, TOO LOW, FLAPS, PULL UP ---) AS WELL AS LOSS OF LNDG GEAR INDICATIONS. WE INITIATED A GAR, BUT CREW COM WAS INTERRUPTED DUE TO LOSS OF INTERCOM. UPON CLB OUT, GEAR SELECTOR LEVER WAS LOCKED DOWN, COULD NOT RAISE GEAR. WE REQUESTED VECTORS FOR ANOTHER APCH AND PRIORITY LNDG. COM WAS LIMITED TO #1 RADIO AND THERE WAS CONFUSION WITH ATC DUE TO ANOTHER ACFT WITH SIMILAR CALL SIGN BLOCKING AND ANSWERING OUR CALLS. CAPT DECLARED EMER BUT EVIDENTLY WAS NOT HEARD DUE TO RADIO FAILURE. WE RECEIVED PRIORITY TO LAND AND LANDED UNEVENTFULLY. OUR CALL SIGN WAS AACC, OTHER ACFT'S CALL SIGN WAS ABCC. SUPPLEMENTAL INFO FROM ACN 345631: WE FINALLY FIGURED OUT THAT, WITH COM #1 SELECTED, WE WERE XMITTING ON COM #2 AND AT THIS POINT WE REGAINED COM WITH DEP CTL.

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.