Air carrier light transport on climbout loses part of dc power bus and complete failure of emergency dc bus #2. Light transport PIC elects to return and land.

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Attributes
ACN	148320
Time
Date	199006
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sli airport : lgb
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 300 flight time total : 4300 flight time type : 800
ASRS Report	148320
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 300 flight time total : 3000 flight time type : 600
ASRS Report	148725
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Flight lgb-smf. On normal climb from lgb experienced what appeared to be failure of the emergency dc bus 2. The systems operating off of this bus appeared to be lost (see attached list #1). It appeared other additional systems failed also (see attached list #2). At this time in my best judgement I felt this was an in-flight emergency. I declared an emergency and indicated the nature of said emergency with coast approach. I also indicated flight was going to land at lgb. I requested fire and crash trucks to be dispatched. The emergencys were evaluated and secured, including manual free-fall of the landing gear, per FARS, normal and abnormal checklists, company operations manual, emergency checklists per flight standards manual, aircraft flight manual and all rules and policies contained within these publications. The aircraft was safely landed back at lgb, with no harm to all 17 passenger on board. Supplemental information from acn 148725: upon landing we determined that we had a complete failure of emergency dc bus ii and a partial failure of dc bus ii.

Original NASA ASRS Text

Title: ACR LTT ON CLIMBOUT LOSES PART OF DC POWER BUS AND COMPLETE FAILURE OF EMERGENCY DC BUS #2. LTT PIC ELECTS TO RETURN AND LAND.

Narrative: FLT LGB-SMF. ON NORMAL CLB FROM LGB EXPERIENCED WHAT APPEARED TO BE FAILURE OF THE EMER DC BUS 2. THE SYSTEMS OPERATING OFF OF THIS BUS APPEARED TO BE LOST (SEE ATTACHED LIST #1). IT APPEARED OTHER ADDITIONAL SYSTEMS FAILED ALSO (SEE ATTACHED LIST #2). AT THIS TIME IN MY BEST JUDGEMENT I FELT THIS WAS AN INFLT EMER. I DECLARED AN EMER AND INDICATED THE NATURE OF SAID EMER WITH COAST APCH. I ALSO INDICATED FLT WAS GOING TO LAND AT LGB. I REQUESTED FIRE AND CRASH TRUCKS TO BE DISPATCHED. THE EMERS WERE EVALUATED AND SECURED, INCLUDING MANUAL FREE-FALL OF THE LNDG GEAR, PER FARS, NORMAL AND ABNORMAL CHKLISTS, COMPANY OPS MANUAL, EMER CHKLISTS PER FLT STANDARDS MANUAL, ACFT FLT MANUAL AND ALL RULES AND POLICIES CONTAINED WITHIN THESE PUBLICATIONS. THE ACFT WAS SAFELY LANDED BACK AT LGB, WITH NO HARM TO ALL 17 PAX ON BOARD. SUPPLEMENTAL INFO FROM ACN 148725: UPON LNDG WE DETERMINED THAT WE HAD A COMPLETE FAILURE OF EMER DC BUS II AND A PARTIAL FAILURE OF DC BUS II.

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.