Casualties unknown

1991-07-24: Beech 76 (N6045M) — Altair Aviation Corp. — Sacramento, CA

Sacramento, CA, US

On July 24, 1991, a Beech 76 (registration N6045M) operated by Altair Aviation Corp. was involved in an aviation accident near Sacramento, CA. Investigators recorded the probable cause as: A FATIGUE FAILURE OF THE LANDING GEAR STRUT DUE TO AN INADEQUATE DESIGN BY THE MANUFACTURER. CONTRIBUTING TO THE ACCIDENT WAS MAINTENANCE PERSONNEL NOT HAVING COMPLETED AN INSPECTION OF THE GEAR STRUT, IN ACCORDANCE WITH THE MANUFACTURER'S SERVICE BULLETIN. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards
Aircraft registered N6045M
Aircraft registered N6045M. Photo: Bill Larkins / CC BY-SA 2.0, via Wikimedia Commons

During a single-engine landing demonstration, the airplane drifted right; corrective actions led to right wing settling. Both engines shut down, causing damage. Inspection revealed a broken gear strut at an inspection hole, subject to a service bulletin and airworthiness directive.

Accident Overview

The certificated airline pilot and flight instructor, serving as pilot-in-command (PIC), was demonstrating a single-engine landing to a certificated private pilot receiving dual instruction. The airplane sustained damage when the right wing settled during the landing roll, after the PIC attempted to correct a drift.

Sequence of Events

During the landing roll, the airplane began to drift to the right. The PIC responded by increasing power on the right engine and applying left rudder. Subsequently, the right wing began to settle toward the ground. The pilot then shut down both engines.

Damage and Inspection

The airplane received damage to the right main landing gear, flaps, and propeller. An inspection revealed that the right gear strut was broken at an inspection hole that had been provided by the manufacturer. The gear strut had been the subject of a manufacturer's service bulletin and a subsequent Federal Aviation Administration (FAA) airworthiness directive. Both documents required an inspection for cracks.

Maintenance Background

According to the investigation, maintenance personnel had received the service bulletin but had not scheduled the required inspection at the time of the accident.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17615. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.