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CHI89IA083

1989-05-02 · MINNEAPOLIS, Minnesota, United States · None · 1 aircraft · Status: Completed

Airport MSP

N434AA has since been reassigned. It is now registered to a different aircraft (ANDURIL INDUSTRIES INC ROADRUNNER), which was not involved in this event.

Aircraft involved

Probable cause & findings

FAILURE OF THE HYDRAULIC POWER TRANSFER UNIT SHUT-OFF (PTU S/O) VALVE DUE TO FAILED (FATIGUED) VALVE BODY ATTACH SCREWS. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1989_CHI89IA083.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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