LEAR 31 FLT CREW EXPERIENCES ALTITUDE DEVIATION WHILE DEALING WITH PRESSURIZATION EMERGENCY.

Narrative

DURING CLB TO FL220 AS ASSIGNED BY ATC (CTR); WE EXPERIENCED AURAL SIGN OF PRESSURIZATION FAIL MODE. ATTEMPTED TO CTL CABIN PRESSURIZATION IN AUTOMATIC; MANUAL; AND EMER MODE WITHOUT RESULTS. AS COPLT IS DEALING WITH THE EMER AND EMER CHKLIST; INCLUDING OXYGEN MASKS; CLBING THROUGH FL180; WE FAILED TO ADJUST THE ALTIMETER SETTING TO 29.92 AND; THEREFORE; WE HAD AN ALTDEV BY THE TIME THE ALTIMETER WAS RESET TO 29.92. THIS ACFT HAD JUST BEEN RELEASED FROM SCHEDULED ROUTINE MAINT. THE MAINT INCLUDED PHASE INSPECTIONS ALONG WITH DUAL ENG MAJOR PERIODIC INSPECTIONS; L WINDSHIELD CHANGE AND NUMEROUS DISCREPANCIES. MY OBSERVATIONS FROM THE CABIN IS THAT THE CABIN WOULD NOT PRESSURIZE AT 17000 FT; THE AURAL WARNING AND ANNUNCIATOR ILLUMINATED. THE PIC FOLLOWED THE EMER CHKLIST TO ALLEVIATE THE ISSUE; WITH THE CREW OXYGEN MASK DONNED THE PRESSURIZATION SYS WOULD NOT OPERATE IN ANY COMMAND MODE; NORMAL; MANUAL OR EMER. SUPPLEMENTAL INFO FROM ACN 773776: DURING CLB AS ASSIGNED BY ATC (CTR); WE EXPERIENCED PROBS WITH THE PRESSURIZATION SYS. AS COPLT; I WAS DEALING WITH THE EMER AND THE EMER ITEMS ON THE EMER CHKLIST. WHILE DEALING WITH THE EMER AT HAND; I DID NOT PUT THE 29.92 AS STANDARD ALTIMETER SETTING IN AND; THEREFORE; WE HAD AN ALTDEV.