EMB135 FLT CREW RPT CHRONIC ELECTRICAL POWER LOSS PROB DURING SINGLE ENG TAXI WITH THE APU RUNNING; WHEN ONE ENG IS SHUT DOWN; THE ACFT LOSES ALL ELECTRICAL POWER TO INCLUDE NOSEWHEEL STEERING.

Narrative

TAXIING IN AT ZZZ AFTER TURNING THE #2 ENG OFF WITH THE APU STARTED AND RUNNING THEN SELECTING THE SHED BUSSES KNOB TO OVERRIDE; THE #2 ENG BLEED DESELECTED; AND TURNING THE CROSSBLEED KNOB TO OPEN; WE LOST THE CAPT'S MFD; FO'S PFD; FO'S MFD HAD A REX X DISPLAYED. ALSO ALL BLEED SYSTEMS AND PACKS WERE LOST AS WELL AS THE NOSEWHEEL STEERING. UPON LOSS OF THE NOSEWHEEL STEERING; I STOPPED THE ACFT ON TXWY. WE NOTIFIED GND CTL THAT WE HAD STOPPED BECAUSE WE LOST OUR NOSEWHEEL STEERING AND ALSO WE ONLY HAD COM1 WORKING WITH COM2 INOP DUE TO THE ELECTRICAL PROB. GND CTL ASKED US IF WE WOULD LIKE THEM TO CALL OUR COMPANY OPS. WE ASKED GND IF WE COULD TALK TO THEM; AND IF WE COULD LEAVE THE FREQ WHILE WE CONTACTED COMPANY. THEY SAID IT WAS OK. AFTER TALKING TO OPS AND MAINT TELLING THEM THE PROB; THEY SENT OUT MAINT AND RAMP PERSONNEL. AFTER TALKING TO MAINT; WE ASKED IF WE SHOULD SHUT DOWN THE #1 ENG. THEY ADVISED US TO KEEP IT RUNNING UNTIL THEY SHOWED UP AT THE ACFT. WHEN MAINT AND RAMP PERSONNEL SHOWED UP; WE GAVE THEM THE GEAR PINS AND THEN SHUT DOWN THE #1 ENG. RAMP AND MAINT PERSONNEL THEN TOWED US IN TO THE GATE. WE DEPLANED UNDER NORMAL CONDITIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THIS LOSS OF POWER HAS BEEN EXPERIENCED BY THE RPTR SEVERAL TIMES AND MOST CREWS HAVE EXPERIENCED THIS TYPE OF INCIDENT ON THE EMBRAER 135 AND 145 ACFT. ON LNDG; THE AUXILIARY POWER UNIT IS STARTED AND THE R ENG IS SHUT DOWN FOR FUEL SAVINGS. THE PNEUMATIC CROSS BLEED IS OPENED AND THE SHEDDING BUSSES KNOB IS SWITCHED TO OVERRIDE AND AFTER A ONE MINUTE DELAY THE AUXILIARY POWER UNIT IS THEN SWITCHED ON TO POWER THE R BUS. AT THIS TIME ALL ELECTRICAL POWER THEN FAILS; LEAVING ONLY THE EMER BUS. COMPLETE LOSS OF COCKPIT DISPLAYS; R AND L PACKS AND NOSE STEERING IS LOST. MAINT ADVISES THERE IS NO KNOWN PROC FOR RESTORING POWER OTHER THAN SHUTTING EVERYTHING DOWN AND REPOWERING. THERE IS ALSO NO FLT OPS MANUAL PROC FOR RESTORING POWER AND FORTUNATELY THIS ANOMALY HAS ONLY HAPPENED ON THE GND; BUT CAN BE A SERIOUS PROB WHILE IN A TURN. MAINT BELIEVES THE PROB IS IN THE I C 600 COMPUTER WHICH CTLS ELECTRICAL BUS SWITCHING AND ELECTRICAL CTLS. CALLBACK CONVERSATION WITH RPTR ACN 658075: THE RPTR STATED THE LOSS OF POWER WHEN SWITCHING THE AUXILIARY POWER UNIT ON TO POWER THE MAIN BUSSES ON THE GND AFTER THE R ENG IS SHUT DOWN IS A KNOWN ANOMALY ON THE EMBRAER 134 AND 145 ACFT. THIS IS THE FIRST TIME THIS HAS HAPPENED TO THE RPTR; BUT THE CAPT HAS EXPERIENCED SEVERAL OF THESE INCIDENTS. MAINT BELIEVES THE PROB IS IN THE I C COMPUTER; WHICH CTLS THE ELECTRICAL POWER SWITCHING.