NTSB Identification: MKC88IA046.
The docket is stored on NTSB microfiche number 37976.
Scheduled 14 CFR
Incident occurred Tuesday, February 02, 1988 in FAYETTEVILLE, AR
Probable Cause Approval Date: 07/29/1992
Aircraft: SAAB-FAIRCHILD SF-340A, registration: N322PX
Injuries: 3 Minor,20 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE CAPT RPRTD THAT DRG THE LNDG ROLL, THERE WAS A LOUD NOISE FROM THE LEFT ENG FOLLOWED BY HVY SMOKE & AN ENG FIRE WARNING BELL. HE STOPPED THE ACFT ON A TWY & ORDERED AN EVACUATION. THE FLT ATTENDANT HAD DIFFICULTY OPENING THE FLOOR-LEVEL EMERG EXIT. NO SLIDE OR ROPE WAS AVAILABLE FOR EXITING THE ACFT; 3 PSGRS RCVD MINOR INJURIES WHEN THEY DROPPED ABT 5-1/2 FT TO THE ICY TWY. AN EXAM REVEALED THE LEFT ENG POWER TURBINE (PT) HAD AN UNCONTAINED FAILURE. A TEARDOWN INSPN OF THE ENG REVEALED THAT A 'B' NUT ON THE STAGE 4 COMPRESSOR BLEED TUBE COUPLING HAD BECOME DISCONNECTED. THIS RESULTED IN A LOSS OF COOLING AIR TO THE PT ROTOR CAVITY & OVERHEATING OF THE STAGE 4 TURBING DISK. MEASUREMENT OF THE STAGE 3 & 4 DISKS SHOWED RADIAL (CREEP) GROWTH OF .006' & .150', RESPECTIVELY. THERE WAS EVIDENCE OF HVY BLADE TIP RUBS INTO THE STATOR TIP SHROUD BACKING MATERIAL (DRG APPLICATION OF REVERSE THRUST), THEN FAILURE OF THE STAGE 4 TURBINE BLADES & THE PT MODULE.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

BLEED AIR SYSTEM,FITTINGS..LOOSE

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MAINTENANCE,INSTALLATION..IMPROPER..COMPANY MAINTENANCE PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

TURBINE ASSEMBLY,TURBINE WHEEL..OVERTEMPERATURE

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

TURBINE ASSEMBLY..FAILURE,TOTAL







Contributing Factors

BLEED AIR SYSTEM,FITTINGS..LEAK

Index for Feb1988 | Index of months