NTSB Identification: MKC89IA048.
The docket is stored on NTSB microfiche number 38629.
Nonscheduled 14 CFR
Incident occurred Thursday, December 29, 1988 in ST. PAUL, MN
Probable Cause Approval Date: 01/24/1990
Aircraft: GULFSTREAM COMMANDER 690A, registration: N690MF
Injuries: 1 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 PIC HAD PREFLTD HIS COMMANDER TURBOPROP AND PREPARED FOR TAKEOFF FM THE ST. PAUL ARPT. DURING THE TAKEOFF ROLL JUST AS THE ACFT WAS ROTATED TO TAKEOFF ATTITUDE, THE RT ENG FAILED. THE PIC EASED THE ACFT BACK TO THE RWY, REDUCED PWR AND CAME TO A STOP ON THE REMAINING RWY. WITH THE REMAINING ENG THE PIC TAXIED BACK TO THE RAMP AREA. INSP OF THE ENG REVEALED A FAILED PLENUM CHAMBER, WITH A LARGE TEAR IN THE INCONEL 718 SHEET METAL. METALLURGICAL EXAM OF THE PLENUM REVEALED MULTIPLE FATIGUE FRACTURE AREAS IN THE WELDED SEAMS. THE ENG WAS SUBSEQUENTLY INSPCTD, A SERVICEABLE PLENUM WAS USED AS A REPLACEMENT AND THE ENGINE WAS RETURNED TO SERVICE.

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

COMBUSTION ASSEMBLY..RUPTURED

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

COMBUSTION ASSEMBLY..FATIGUE

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