FAA incident report · Lear 55LEAR · Tucson, AZ · November 26, 1986
From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
During test flight for autopilot maintenance,aircraft descended 400 feet. Altitude hold malfunctioned.
DURING TEST FLIGHT FOR AUTOPILOT MAINTENANCE,AIRCRAFT DESCENDED 400 FEET. ALTITUDE HOLD MALFUNCTIONED.