Incident · 1989-05-02

NTSB case CHI89IA083 · MCDONNELL DOUGLAS DC-9-82 · Part 121

What the record says

Event date: 1989-05-02
Event type: Incident
Highest injury level: No injuries
Aircraft: MCDONNELL DOUGLAS DC-9-82 (N434AA)
Operating rule: Part 121
Operator: operator not named in the NTSB record

Probable cause

FAILURE OF THE HYDRAULIC POWER TRANSFER UNIT SHUT-OFF (PTU S/O) VALVE DUE TO FAILED (FATIGUED) VALVE BODY ATTACH SCREWS.

Source: NTSB case CHI89IA083

Flight crew

Flight-crew details for this event aren't in the NTSB database extract we hold (its coverage starts with 2008 events) — a gap in our data, not an absence of crew.

Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.

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