Incident Overview

Date: Saturday 23 July 2011
Aircraft Type: Boeing 737-33A
Owner/operator: Jet2
Registration Number: G-CELD
Location: Paris-Charles de Gaulle Airport (CDG/LFPG) – ÿ France
Phase of Flight: Landing
Status: Substantial
Casualties: Fatalities: 0 / Occupants: 133
Component Affected: Right Main Landing Gear (specifically the lower torsion link).Right Main Landing Gear (specifically the lower torsion link).
Investigating Agency: BEABEA
Category: Accident
A Boeing 737-33A aircraft experienced a significant landing incident during a stabilized approach to Runway 27R in Paris Charles de Gaulle Airport. Upon touchdown, the pilot reported violent vibrations, particularly through the rudder pedals, during the landing roll. The aircraft subsequently deviated slightly to the right of the runway centerline and experienced oscillations that stopped abruptly at approximately 75 kt. The aircraft then reversed its position relative to the runway centerline, reaching a maximum lateral deviation of approximately 10 meters to the right, before stopping and being towed to the ramp. Significant damage was observed on the right main landing gear, specifically on the lower torsion link. The accident was attributed to a failure to reconnect the shimmy damper hydraulic line to the aircraft?s hydraulic system, resulting from inadequate resource planning and supervisor performance issues. This resulted in weakened torsion link and sudden failure.A Boeing 737-33A aircraft experienced a significant landing incident during a stabilized approach to Runway 27R in Paris Charles de Gaulle Airport. Upon touchdown, the pilot reported violent vibrations, particularly through the rudder pedals, during the landing roll. The aircraft subsequently deviated slightly to the right of the runway centerline and experienced oscillations that stopped abruptly at approximately 75 kt. The aircraft then reversed its position relative to the runway centerline, reaching a maximum lateral deviation of approximately 10 meters to the right, before stopping and being towed to the ramp. Significant damage was observed on the right main landing gear, specifically on the lower torsion link. The accident was attributed to a failure to reconnect the shimmy damper hydraulic line to the aircraft?s hydraulic system, resulting from inadequate resource planning and supervisor performance issues. This resulted in weakened torsion link and sudden failure.

Description

The Boeing 737-33A was on a stabilised approach to runway 27R atr Paris Charles de Gaulle Airport, France. The aeroplane landed with a ground speed of 129 kt. The crew stated that they felt violent vibrations as soon as the wheels touched down, especially through the rudder pedals. During the landing roll, the recorded lateral load varied with increasing amplitude up to 0.8 g at 90 kt (the lateral load factor then reached the absolute maximum value of 0.41 g) then dropped towards 0.4 g at 80 kt. The aeroplane?s path began to deviate slightly to the right of the runway centreline. The oscillations stopped suddenly when the speed reached 75 kt. The aeroplane?s lateral deviation in relation to the runway centreline reached a maximum of about 10 m to the right, then the aeroplane moved back onto the centreline. The aeroplane left the runway via taxiway Z3 and came to a stop before being towed to the ramp. Significant damage was observed on the right main landing gear, especially on the lower torsion link. Conclusion: The accident was caused by the failure, undetected by the maintenance personnel, to reconnect the right main landing gear shimmy damper hydraulic line to the aeroplane?s hydraulic system. The vibrations caused during landing rollout could not be damped down and weakened the torsion link until it failed suddenly. The following factors contributed to the accident: – Poor resource planning caused overstretching of the personnel?s capacities when unexpected extra work turned up. This generated increased time pressure that led to things being forgotten and approximate execution of the work cards. – The supervisor had worked for an excessive number of hours over a long period of time, which lowered his performance and his aptitude to carry out checks efficiently. – Boeing work card nø32-011-00-02 in force in July 2011 did not specifically mention re-connecting the shimmy damper hydraulic line to the aeroplane?s hydraulic system.

Source of Information

https://bea.aero/en/investigation-reports/notified-events/detail/vibrations-rupture-du-compas-du-train-principal-droit-lors-du-roulement-a-latterrissage/https://bea.aero/en/investigation-reports/notified-events/detail/vibrations-rupture-du-compas-du-train-principal-droit-lors-du-roulement-a-latterrissage/

Primary Cause

Inadequate maintenance procedures and resource planning regarding the reconnection of the shimmy damper hydraulic line to the aircraft’s hydraulic system.Inadequate maintenance procedures and resource planning regarding the reconnection of the shimmy damper hydraulic line to the aircraft’s hydraulic system.

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