LJ35 crew lost both essential busses.

Attributes
ACN	445506
Time
Date	199908
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iah.airport
State Reference	TX
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : i90.tracon
Operator	common carrier : charter
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 6000 flight time type : 1200
ASRS Report	445506
Person 2
Affiliation	company : charter
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance Company
Primary Problem	Aircraft

Narrative:

After departing hou airport for a repositioning flight for maintenance to iah airport, we leveled off at 2000 ft MSL and were assigned a heading for vectors to ILS runway 27 at iah. We then experienced a loss of electrical power on the left and right essential busses. The bus tie did not pop. We lost both communications and navs. I was able to reset the left bus for about 1 min to let approach know the situation. We lost the left bus again about 4 mi from the airport. We landed with no other problems. Maintenance found the circuit breakers (bus tie, l-hand ess, and r-hand ess) to be worn and were replaced. Aircraft was returned to service.

Original NASA ASRS Text

Title: LJ35 CREW LOST BOTH ESSENTIAL BUSSES.

Narrative: AFTER DEPARTING HOU ARPT FOR A REPOSITIONING FLT FOR MAINT TO IAH ARPT, WE LEVELED OFF AT 2000 FT MSL AND WERE ASSIGNED A HDG FOR VECTORS TO ILS RWY 27 AT IAH. WE THEN EXPERIENCED A LOSS OF ELECTRICAL PWR ON THE L AND R ESSENTIAL BUSSES. THE BUS TIE DID NOT POP. WE LOST BOTH COMS AND NAVS. I WAS ABLE TO RESET THE L BUS FOR ABOUT 1 MIN TO LET APCH KNOW THE SIT. WE LOST THE L BUS AGAIN ABOUT 4 MI FROM THE ARPT. WE LANDED WITH NO OTHER PROBS. MAINT FOUND THE CIRCUIT BREAKERS (BUS TIE, L-HAND ESS, AND R-HAND ESS) TO BE WORN AND WERE REPLACED. ACFT WAS RETURNED TO SVC.

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.