Accident · 1989-09-12

NTSB case CHI89FA183 · McDonnell Douglas MD-80 · Part 121

What the record says

Event date: 1989-09-12
Event type: Accident
Highest injury level: Minor injury
Aircraft: McDonnell Douglas MD-80 (N244AA)
Operating rule: Part 121
Operator: AMERICAN AIRLINES, INC. Operator named in NTSB report
Operated by (per NTSB report): AMERICAN AIRLINES

Probable cause

A LOSS OF HYDRAULIC SYSTEM PRESSURE DUE TO THE OPERATOR'S FAILURE TO REPLACE A SYSTEM COMPONENT THAT HAD A KNOWN HISTORY OF FAILURES, AND THE PILOT'S IMPROPER USE POWERPLANT CONTROLS RESULTING IN A DEGRADATION OF RUDDER EFFECTIVENESS. A CONTRIBUTING FACTOR WAS THE FAILURE OF THE POWER TRANSFER UNIT SHUTOFF VALVE.

Source: NTSB case CHI89FA183

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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