DRG TAKEOFF, THE ACFT (MIDWEST EXPRESS FLT 105) WAS CLIMBING THRU ABOUT 450' AGL WHEN THERE WAS A LOUD NOISE AS THE RGT ENG FAILED. SHORTLY THEREAFTER, THE ACFT ENTERED A STEEP DSCNT & CRASHED IN AN APRX 90 DEG, RGT WING LOW, ATTITUDE. AN INV REVEALED THAT THE 9TH TO 10TH STAGE, HI PRESSURE COMPRESSOR SPACER IN THE RGT ENG HAD FAILED. THERE WAS EVIDENCE THE FAILURE WAS PRECIPITATED BY A FATIGUE CRACK IN 1 OF THE 2 KNIFE EDGES ON THE SPACER. INITIALLY, CORRECT (LEFT) RUDDER RESPONSE WAS USED TO COMPENSATE FOR THE LOSS OF POWER IN THE RGT ENG, BUT ABOUT 4 TO 5 SEC LATER, RGT RUDDER DEFLECTION OCCURRED. APRX 10 SEC AFTER THE RGT ENG FAILED, THE ACFT STALLED & WENT OUT OF CONTROL. ALSO, ABOUT 1.5 SEC AFTER THE INITIAL RGT ENG FAILURE, THERE WAS A REDUCTION IN THE LEFT ENG'S RPM, & SUBSEQUENTLY, THE ENG COMPRESSOR STALLED AFTER THE ACFT WENT OUT OF CONTROL & WAS DSCNDG IN AN UNUSUAL ATTITUDE. HOWEVER, THE REDUCTION OF POWER IN THE LEFT ENG WAS NOT CONSIDERED SIGNIFICANT TO THE LOSS OF CONTROL. NEITHER PLT VERBALLY IDENTIFIED THE EMERG CONDITION DRG THE SEQUENCE.
Probable Cause
Flight controls..Improper use of..Pilot in command
Emergency procedure..Improper..no person specified
Stall..Inadvertent..Pilot in command
Contributing Factors
Compressor assembly..Fatigue
Crew/group coordination..Improper..no person specified