An emb 120 flight crew notes a loss of their emergency dc bus #2 which eventually resulted in 2 gars for gear extension and checklist compliance prior to landing at lax, ca.

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Attributes
ACN	476705
Time
Date	200006
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 119
Navigation In Use	ils localizer & glide slope : 24r
Flight Phase	descent : intermediate altitude landing : go around
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 4000
ASRS Report	476705
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 3025 flight time type : 1000
ASRS Report	477025
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : elec warning light other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : executed go around flight crew : landed in emergency condition
Consequence	other other
Supplementary
Problem Areas	Company Chart Or Publication Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Entering downwind to runway 24R at lax the emergency bus off light illuminated on overhead panel, electrical on map illuminated, and caution light was flashing. I noted the loss of many indications and immediately consulted the QRH. Ran emergency bus off light checklist, consulted afm 3-9, and determined loss of emergency dc bus #2. Needed more time to go over items and rerun QRH. Then took aircraft and had first officer run QRH. We elected to go around during these proceeding to take the time to run checks. Having not declared an emergency at this time, we got back in line to land at lax. WX was a high overcast good visibility. On ILS gear would not come down via gear handle. Asked to go around and head over pacific ocean to hold and work on gear problem. Called maintenance control via atlanta radio for extra help. Gear did not come down because of electrical loss, and we used electrical override switch with the QRH as our guide. Gear came down and we had 3 green lights. I elected to ask for emergency vehicles because of using an abnormal procedure to lower landing gear. Landed uneventfully. Passenger briefed honestly 4 times. 1) electrical problem, 2) problem ok, 3) gear problem, and 4) gear problem fixed.

Original NASA ASRS Text

Title: AN EMB 120 FLC NOTES A LOSS OF THEIR EMER DC BUS #2 WHICH EVENTUALLY RESULTED IN 2 GARS FOR GEAR EXTENSION AND CHKLIST COMPLIANCE PRIOR TO LNDG AT LAX, CA.

Narrative: ENTERING DOWNWIND TO RWY 24R AT LAX THE EMER BUS OFF LIGHT ILLUMINATED ON OVERHEAD PANEL, ELECTRICAL ON MAP ILLUMINATED, AND CAUTION LIGHT WAS FLASHING. I NOTED THE LOSS OF MANY INDICATIONS AND IMMEDIATELY CONSULTED THE QRH. RAN EMER BUS OFF LIGHT CHKLIST, CONSULTED AFM 3-9, AND DETERMINED LOSS OF EMER DC BUS #2. NEEDED MORE TIME TO GO OVER ITEMS AND RERUN QRH. THEN TOOK ACFT AND HAD FO RUN QRH. WE ELECTED TO GO AROUND DURING THESE PROCEEDING TO TAKE THE TIME TO RUN CHKS. HAVING NOT DECLARED AN EMER AT THIS TIME, WE GOT BACK IN LINE TO LAND AT LAX. WX WAS A HIGH OVCST GOOD VISIBILITY. ON ILS GEAR WOULD NOT COME DOWN VIA GEAR HANDLE. ASKED TO GO AROUND AND HEAD OVER PACIFIC OCEAN TO HOLD AND WORK ON GEAR PROB. CALLED MAINT CTL VIA ATLANTA RADIO FOR EXTRA HELP. GEAR DID NOT COME DOWN BECAUSE OF ELECTRICAL LOSS, AND WE USED ELECTRICAL OVERRIDE SWITCH WITH THE QRH AS OUR GUIDE. GEAR CAME DOWN AND WE HAD 3 GREEN LIGHTS. I ELECTED TO ASK FOR EMER VEHICLES BECAUSE OF USING AN ABNORMAL PROC TO LOWER LNDG GEAR. LANDED UNEVENTFULLY. PAX BRIEFED HONESTLY 4 TIMES. 1) ELECTRICAL PROB, 2) PROB OK, 3) GEAR PROB, AND 4) GEAR PROB FIXED.

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.