Incident Overview

Date: Wednesday 18 June 2003
Aircraft Type: Antonov An-124-100
Owner/operator: Antonov Design Bureau
Registration Number: UR-82029
Location: Roma-Fiumicino Airport (FCO/LIRF) – ÿ Italy
Phase of Flight: Taxi
Status: Substantial, repaired
Casualties: Fatalities: 0 / Occupants: 21
Component Affected: The right front landing gear rotation arm.The right front landing gear rotation arm.
Investigating Agency: ANSVANSV
Category: Accident
An aircraft experienced a ground incident due to a failure of its right front landing gear during taxiing to Basra. A right turn induced a gear failure, halting the aircraft and blocking taxiways for 20 hours. The failure was likely caused by fatigue failure of the rotation arm, exacerbated by corrosion, and was easily detectable by maintenance.An aircraft experienced a ground incident due to a failure of its right front landing gear during taxiing to Basra. A right turn induced a gear failure, halting the aircraft and blocking taxiways for 20 hours. The failure was likely caused by fatigue failure of the rotation arm, exacerbated by corrosion, and was easily detectable by maintenance.

Description

After completing cargo loading operations, the aircraft was taxiing to reach the runway for takeoff with a destination of Basra (Iraq). During this maneuver, while making a right turn to enter the next taxiway, the right force leg of the front landing gear failed. The crew applied the stop procedure, bringing the aircraft to a halt on the spot. The aircraft’s position, at the intersection of two taxiways, blocked the normal transit of other aircraft, necessitating the closure of those taxiways for approximately 20 hours. Probable cause: Fatigue failure of the rotation arm of the force leg of the right front landing gear, triggered by stress-corrosion phenomena in the material. Stress corrosion is a well-known phenomenon in the operation of high-strength steel structures. This phenomenon, however, occurs gradually and is therefore easily controllable through specific non-destructive testing. In the case at hand, given the extent of the fatigue failure (about a quarter of the entire load-bearing section) and the presence of oily residues on its surfaces, it is believed that this failure could not have gone unnoticed by the relevant maintenance and inspection entities.

Primary Cause

Fatigue failure of the rotation arm of the right front landing gear, triggered by stress-corrosion phenomena in the material.Fatigue failure of the rotation arm of the right front landing gear, triggered by stress-corrosion phenomena in the material.

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