What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) 12/15/1999, Midwest express flight 921 departed sfo direct mke. 2202Z, at 33,000 ft cruise altitude over central Nevada, the flight crew experienced a vibration in the flight controls and aircrame. The captain was alerted by one of the flight attendants that there was very pronounced vibration near the engines. The captain then walked to the rear of the aircraft to check. Finding the #1 engine was the cause of the vibration, he returned to the cockpit and immediately started the emergency engine shut-down procures. The flight crew then determined that the closest alternate available was Reno. They then declared their intensions to the Reno tower. The aircraft landed with no further incident at 2224Z on runway 16R. I inspected the aircraft and the engines. The left engine bullet and the #1 compressor blade assy had been struck with FOD, damaging the blades and the sound proofing area. One of the compressor blades had about a six inch outboard portion of the blade missing. There was a large amount of oil on cowling and leaking on the ground. 12/16/1999, the aircraft was moved to an adjacent work area where mechanics from midwest express removed the left engine. The starter/generator was loose and an oil line on top of the engine was broken at a fitting, letting all of the engine oil to be pumpted overboard. 12/19/1999 the midwest mechanics inspected the airframe and installed a servicable engine as per the work cards and an rii inspector. The engines were run and the aircraft was then flown back to milwaulkie, WI home base for midwest express. An m & d report is to follow the engine teardown and inspection.
As the FAA filed it
(-23) 12/15/1999, MIDWEST EXPRESS FLIGHT 921 DEPARTED SFO DIRECT MKE. 2202Z, AT 33,000 FT CRUISE ALTITUDE OVER CENTRAL NEVADA, THE FLIGHT CREW EXPERIENCED A VIBRATION IN THE FLIGHT CONTROLS AND AIRCRAME. THE CAPTAIN WAS ALERTED BY ONE OF THE FLIGHT ATTENDANTS THAT THERE WAS VERY PRONOUNCED VIBRATION NEAR THE ENGINES. THE CAPTAIN THEN WALKED TO THE REAR OF THE AIRCRAFT TO CHECK. FINDING THE #1 ENGINE WAS THE CAUSE OF THE VIBRATION, HE RETURNED TO THE COCKPIT AND IMMEDIATELY STARTED THE EMERGENCY ENGINE SHUT-DOWN PROCURES. THE FLIGHT CREW THEN DETERMINED THAT THE CLOSEST ALTERNATE AVAILABLE WAS RENO. THEY THEN DECLARED THEIR INTENSIONS TO THE RENO TOWER. THE AIRCRAFT LANDED WITH NO FURTHER INCIDENT AT 2224Z ON RUNWAY 16R. I INSPECTED THE AIRCRAFT AND THE ENGINES. THE LEFT ENGINE BULLET AND THE #1 COMPRESSOR BLADE ASSY HAD BEEN STRUCK WITH FOD, DAMAGING THE BLADES AND THE SOUND PROOFING AREA. ONE OF THE COMPRESSOR BLADES HAD ABOUT A SIX INCH OUTBOARD PORTION OF THE BLADE MISSING. THERE WAS A LARGE AMOUNT OF OIL ON COWLING AND LEAKING ON THE GROUND. 12/16/1999, THE AIRCRAFT WAS MOVED TO AN ADJACENT WORK AREA WHERE MECHANICS FROM MIDWEST EXPRESS REMOVED THE LEFT ENGINE. THE STARTER/GENERATOR WAS LOOSE AND AN OIL LINE ON TOP OF THE ENGINE WAS BROKEN AT A FITTING, LETTING ALL OF THE ENGINE OIL TO BE PUMPTED OVERBOARD. 12/19/1999 THE MIDWEST MECHANICS INSPECTED THE AIRFRAME AND INSTALLED A SERVICABLE ENGINE AS PER THE WORK CARDS AND AN RII INSPECTOR. THE ENGINES WERE RUN AND THE AIRCRAFT WAS THEN FLOWN BACK TO MILWAULKIE, WI HOME BASE FOR MIDWEST EXPRESS. AN M & D REPORT IS TO FOLLOW THE ENGINE TEARDOWN AND INSPECTION.