Narrative:

Level FL350. Cabin began uncontrolled climb. Captain and first officer donned oxygen mask, did cabin pressurization loss check and attempted to declare emergency with ATC and began emergency descent. Unable to talk with ATC on communication #1 and #2, selected emergency power and regained communication #1. Declared emergency and squawked 7700. Began emergency descent check and regained control of cabin. Continued descent and began diversion. Advised flight attendant, ATC and company. Was advised by flight attendant some cabin lighting had gone out but standby lighting available through emergency power. We now had various annunciator lights illuminated but nothing to indicate any total bus failure or generator problems. While being vectored for ILS uncertain of navigation capabilities since we had not yet acquired ILS signal or identify, requested VFR reporting airports or possibility of PAR approach to diversion airport due to WX (700 ft taxi). Finally received good ILS signal. During descent and approach, captain's windshield iced over and did not have full ice protection capability of aircraft, accomplished descent, approach and landing checks, landed successfully. Was able to clear runway and requested arff to do exterior visual inspection of aircraft and received all clear. Requested aircraft to be towed to gate, passenger remained on board until parked at gate. Maintenance believes we had lost 2 of 3 phases on left AC bus, as all items inoperative were common to left AC bus.

Related reports:

Google
 

Original NASA ASRS Text

Title: DC9-10 CREW HAD VARIOUS ELECTRICAL FAILURES AND PRESSURIZATION PROBS IN ZOB CLASS A.

Narrative: LEVEL FL350. CABIN BEGAN UNCTLED CLB. CAPT AND FO DONNED OXYGEN MASK, DID CABIN PRESSURIZATION LOSS CHK AND ATTEMPTED TO DECLARE EMER WITH ATC AND BEGAN EMER DSCNT. UNABLE TO TALK WITH ATC ON COM #1 AND #2, SELECTED EMER PWR AND REGAINED COM #1. DECLARED EMER AND SQUAWKED 7700. BEGAN EMER DSCNT CHK AND REGAINED CTL OF CABIN. CONTINUED DSCNT AND BEGAN DIVERSION. ADVISED FLT ATTENDANT, ATC AND COMPANY. WAS ADVISED BY FLT ATTENDANT SOME CABIN LIGHTING HAD GONE OUT BUT STANDBY LIGHTING AVAILABLE THROUGH EMER PWR. WE NOW HAD VARIOUS ANNUNCIATOR LIGHTS ILLUMINATED BUT NOTHING TO INDICATE ANY TOTAL BUS FAILURE OR GENERATOR PROBS. WHILE BEING VECTORED FOR ILS UNCERTAIN OF NAV CAPABILITIES SINCE WE HAD NOT YET ACQUIRED ILS SIGNAL OR IDENT, REQUESTED VFR RPTING ARPTS OR POSSIBILITY OF PAR APCH TO DIVERSION ARPT DUE TO WX (700 FT TAXI). FINALLY RECEIVED GOOD ILS SIGNAL. DURING DSCNT AND APCH, CAPT'S WINDSHIELD ICED OVER AND DID NOT HAVE FULL ICE PROTECTION CAPABILITY OF ACFT, ACCOMPLISHED DSCNT, APCH AND LNDG CHKS, LANDED SUCCESSFULLY. WAS ABLE TO CLR RWY AND REQUESTED ARFF TO DO EXTERIOR VISUAL INSPECTION OF ACFT AND RECEIVED ALL CLR. REQUESTED ACFT TO BE TOWED TO GATE, PAX REMAINED ON BOARD UNTIL PARKED AT GATE. MAINT BELIEVES WE HAD LOST 2 OF 3 PHASES ON L AC BUS, AS ALL ITEMS INOP WERE COMMON TO L AC BUS.

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.