What was found
AFTER TAKE OFF THE CREW REPORTED AN ODOR OF SULFUR IN THE CABIN. AT 2,000 AGL THE EMERGENCY PRESSURIZATION SYSTEM ENGAGED, AND CREW DONNED THEIR OXYGEN MASKS. THE AIRCRAFT RETURNED TO KLEX AND AN EMERGENCY EVACUATION OF THE AIRCRAFT WAS PERFORMED ON THE TAXIWAY. MAINTENANCE ISSUED MEL 21-1 FOR THE AIR CYCLE MACHINE. THE AIRCRAFT IS TO BE OPERATED WITHOUT PRESSURIZATION UNDER THE MEL. ON 06 JUNE 2005, MAINTENANCE REPLACED THE ACM, HEAT EXCHANGER, AND COALESCER FILTER. THE AIRCRAFT WAS RETURNED TO SERVICE.