Incident Overview

Date: Tuesday 18 July 2006
Aircraft Type: Airbus A321-231
Owner/operator: Onur Air
Registration Number: TC-OAN
Location: Rotterdam Airport (RTM) – ÿ Netherlands
Phase of Flight: Landing
Status: Substantial, repaired
Casualties: Fatalities: 0 / Occupants: 153
Component Affected: Aircraft tail sectionAircraft tail section
Investigating Agency: Dutch Safety BoardDutch Safety Board
Category: Accident
Onur Air flight OHY601 experienced a ground impact during a VOR-DME approach at Rotterdam Airport. The aircraft was manually controlled and the thrust was determined by the auto thrust system. The tail section struck the ground, resulting in significant damage. The pilot reacted by increasing the pitch attitude, suggesting a potential issue with the auto thrust system’s power delivery. The pilot did not observe the auto thrust system’s reaction, and the first officer did not intervene to check the instruments.Onur Air flight OHY601 experienced a ground impact during a VOR-DME approach at Rotterdam Airport. The aircraft was manually controlled and the thrust was determined by the auto thrust system. The tail section struck the ground, resulting in significant damage. The pilot reacted by increasing the pitch attitude, suggesting a potential issue with the auto thrust system’s power delivery. The pilot did not observe the auto thrust system’s reaction, and the first officer did not intervene to check the instruments.

Description

In the morning, the aircraft departed from Antalya (LTAI) in Turkey, as flight OHY601, with 146 passengers and seven crew members on board. During the VOR-DME approach for runway 06 at Rotterdam Airport, the aircraft was controlled manually and the thrust was determined by the automatic throttle control system (‘auto thrust system’). At 09.47 hours local time the aircraft landed before the beginning of the runway. During this landing the tail of the aircraft hit the ground, causing considerable damage to the tail section. The captain, who was also the pilot flying, stated that the aircraft lost speed and altitude during the last part of the approach. He reacted to this by having the aircraft adopt a higher pitch attitude. According to him the auto thrust system would have had to deliver more power due to the higher pitch. He stated that he did not notice the desired reaction by the auto thrust system because he was looking outside at that moment. It is not clear if and how the first officer checked the instruments during this phase of the flight. He did not intervene nor did he point out the speed drop to the captain.` CONCLUSION The accident could have been prevented if Onur Air’s procedures had been followed correctly. Due to the limited scope of this investigation the underlying causes of not following these procedures were not investigated.

Primary Cause

Auto thrust system malfunction or limitations in its power delivery capabilities during the approach, potentially due to a failure in the system’s algorithms or hardware.Auto thrust system malfunction or limitations in its power delivery capabilities during the approach, potentially due to a failure in the system’s algorithms or hardware.

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