Incident · 1990-11-06

NTSB case MIA91IA022 · AEROSPATIALE ATR-42-300 · Part 121

What the record says

Event date: 1990-11-06
Event type: Incident
Highest injury level: No injuries
Aircraft: AEROSPATIALE ATR-42-300 (N972NA)
Operating rule: Part 121
Operator: Executive Air Charter LLC Operator named in NTSB report
Operated by (per NTSB report): EXECUTIVE AIR CHARTER, INC.

Probable cause

THE IMPROPER USE OF AILERON TRIM AND THE IMPROPER PREPARATION FOR AUTO PILOT DISCONNECT BY THE FLIGHT CREW COMBINED WITH EXCESSIVE FORCES APPLIED BY THE AILERON TRIM SYSTEM RESULTING IN A DEPARTURE FROM CONTROLLED FLIGHT. CONTRIBUTING FACTORS TO THE INCIDENT WERE INADEQUATE AND MISLEADING AUTOPILOT WARNINGS, LACK OF CONSPICUITY OF THE AILERON TRIM INDICATOR, LACK OF FAA REGULATION GOVERNING CONTROL AUTHORITY IN MISTRIM CONDITIONS, AUTOPILOT SYSTEM MASKING OF MISTRIM CONDITIONS, AND THE LACK OF FAA REQUIREMENT FOR RECURRENT PILOT TRAINING IN AUTOPILOT USE.

Source: NTSB case MIA91IA022

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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