Narrative:

We took off from trm en route to sdl. While climbing through FL220 and at 300 KIAS, we heard a loud bang coming from the front section of the aircraft. I called our company on the flight phone and we were authority/authorized to divert to lgb where there is a maintenance facility. I was the PNF in the right seat, so I contacted ATC and asked for a diversion to lgb. They gave us a left turn initially just to get us in that direction while they worked on a route. As we turned around and received the rest of the route, the #4 display unit failed. Immediately after that, we began to smell electrical smoke and I saw a small amount coming from the right side of the center pedestal. I immediately notified ATC that we had smoke in the cockpit and declared an emergency while the PF started a dive. I reached over and shut off all avionics, EICAS and exterior lights. I then asked for vectors to the nearest airport and ATC started giving vectors to blh. We saw the airport off the nose and noticed that the smoke was gone and the smell had begun to dissipate. We discussed it and decided we had the problem isolated and made the decision to land at psp. We concluded that psp would be close to the same amount of time, considering the spiraling descent to blh and that psp was a much larger airport and better equipped to handle an emergency aircraft. We continued to psp and landed safely using normal landing procedures.

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Original NASA ASRS Text

Title: C750 CREW HAD A LOUD BANG FROM THE FRONT OF THE ACFT. THEY THEN HAD SMOKE IN THE COCKPIT.

Narrative: WE TOOK OFF FROM TRM ENRTE TO SDL. WHILE CLBING THROUGH FL220 AND AT 300 KIAS, WE HEARD A LOUD BANG COMING FROM THE FRONT SECTION OF THE ACFT. I CALLED OUR COMPANY ON THE FLT PHONE AND WE WERE AUTH TO DIVERT TO LGB WHERE THERE IS A MAINT FACILITY. I WAS THE PNF IN THE R SEAT, SO I CONTACTED ATC AND ASKED FOR A DIVERSION TO LGB. THEY GAVE US A L TURN INITIALLY JUST TO GET US IN THAT DIRECTION WHILE THEY WORKED ON A RTE. AS WE TURNED AROUND AND RECEIVED THE REST OF THE RTE, THE #4 DISPLAY UNIT FAILED. IMMEDIATELY AFTER THAT, WE BEGAN TO SMELL ELECTRICAL SMOKE AND I SAW A SMALL AMOUNT COMING FROM THE R SIDE OF THE CTR PEDESTAL. I IMMEDIATELY NOTIFIED ATC THAT WE HAD SMOKE IN THE COCKPIT AND DECLARED AN EMER WHILE THE PF STARTED A DIVE. I REACHED OVER AND SHUT OFF ALL AVIONICS, EICAS AND EXTERIOR LIGHTS. I THEN ASKED FOR VECTORS TO THE NEAREST ARPT AND ATC STARTED GIVING VECTORS TO BLH. WE SAW THE ARPT OFF THE NOSE AND NOTICED THAT THE SMOKE WAS GONE AND THE SMELL HAD BEGUN TO DISSIPATE. WE DISCUSSED IT AND DECIDED WE HAD THE PROB ISOLATED AND MADE THE DECISION TO LAND AT PSP. WE CONCLUDED THAT PSP WOULD BE CLOSE TO THE SAME AMOUNT OF TIME, CONSIDERING THE SPIRALING DSCNT TO BLH AND THAT PSP WAS A MUCH LARGER ARPT AND BETTER EQUIPPED TO HANDLE AN EMER ACFT. WE CONTINUED TO PSP AND LANDED SAFELY USING NORMAL LNDG PROCS.

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.