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DCA89IA066

1989-08-09 · DENVER, Colorado, United States · None · 1 aircraft · Status: Completed

Aircraft involved

Probable cause & findings

FATIGUE FAILURE AND SEPARATION OF A FIRST-STAGE COMPRESSOR FAN BLADE.

Factual narrative

WHILE CLIMBING THROUGH 38,000 FEET, THE AIRCRAFT EXPERIENCED AN UNCONTAINED FAN BLADE SEPARATION IN THE NO. 2 ENGINE. INVESTIGATION REVEALED THAT ONE OF THE FIRST-STAGE COMPRESSOR FAN BLADES (S/N EB2506) HAD SEPARATED ABOUT 8 INCHES ABOVE THE BLADE PLATFORM. FRAGMENTS FROM THE BLADE (#8) HAD EXITED THROUGH THE LEFT FAN COWL IN THREE PLACES AND HAD PENETRATED THE VERTICAL STABILIZER. THE BLADE SEPARATION STEMMED FROM A 0.34-INCH LONG FATIGUE CRACK THAT BEGAN IN A WELD ADJACENT TO A PATCH. THE FAN BLADE HAD BEEN PATCH-REPAIRED EARLIER, AND SUBJECTED TO FOUR NON-DESTRUCTIVE TESTS: X-RAY, FLUORESCENT PENETRANT, ULTRASONIC, AND EDDY CURRENT. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1989_DCA89IA066.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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