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ANC89FA034

1989-01-13 · FORT YUKON, Alaska, United States · None · 1 aircraft · Status: Completed

Aircraft involved

Probable cause & findings

THE SEPARATION OF A SINGLE PROPELLER BLADE WHICH CAUSED THE DOWNWARD AND REARWARD DISPLACEMENT OF THE NUMBER TWO ENGINE.

Factual narrative

DURING CRUISE FLIGHT AT 8000 FEET ABOVE MEAN SEA LEVEL THE CO-PILOT NOTICED A 100 POUND TORQUE INCREASE ON THE NUMBER TWO ENGINE. DURING HIS ATTEMPT TO REDUCE THE TORQUE HE HEARD AN EXPLOSION, SAW SPARKS COME FROM THE NUMBER TWO ENGINE EXHAUST STACKS AND OBSERVED A SLOW TURNING PROPELLER AS THE ENTIRE ENGINE NACELLE DISAPPEARED BENEATH THE AIRPLANE. FULL POWER ON THE NUMBER ONE ENGINE ALLOWED THE CREW TO REDUCE THE RATE OF DESCENT TO 1,500 FOOT PER MINUTE AND THEY CRASH LANDED ON THE FROZEN RIVER. ON SITE EXAMINATION REVEALED ONE PROPELLER BLADE FROM THE NUMBER TWO ENGINE WAS MISSING AND THAT THE NUMBER TWO ENGINE HAD SEPARATED DURING THE IMPACT SEQUENCE. SUBSEQUENT METALLURGICAL EXAMINATION SHOWED A FATIGUE FRACTURE ON THE REMAINING STUB OF THE MISSING BLADE. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1989_ANC89FA034.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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