OB-2036-P 737-300 Gear Collapse and Fire on Landing

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28 Mar 2017 - Peruvian Airlines 737-300, OB-2036-P (25071/2039), Gear collapse and fire on landing at Jauja

The flight from Lima to Jauja (SPJJ, elevation 11,034ft) landed on Runway 31 (LDA 2810m) at 21:40z. After touchdown a shimmy established in the RH MLG landing gear followed by the same in the LH MLG, causing them to fail. The aircraft veered off the right hand side of the runway causing the remaining landing gear to collapse. The right wing of the aircraft went through the perimeter fence causing a fire.

Media reporting 29 occupants have been taken to hospital with injuries but no fatalities.

For a full analysis of 737 Classic MLG failures on landing please follow this link.

The final report was issued in October 2021

Probable cause

Failure of the mechanical components of the shimmy damper systems of both main landing gear struts which, due to being outside tolerances, were not able to correctly dampen the vibrations and lateral oscillations of the wheels causing "shimmy" events. The sequence of shimmy events in both main gear struts led to the fracture and collapse of both main gear struts.

Contributing Factors

1. Incorrect and probable absence of measurements on mechanical components of the "CYMEMATIC CHAIN FOR THE OPERATION OF SD", as indicated by the AMM Task of the operator's PM, which would have allowed timely detection and replacement of the components out of tolerance, guaranteeing their integrity and correct operation.

2. The Service Letter 737-SL-32-057-E “FRACTURES in LOWER Torsion Link”, no has mandatory actions, only recommends maintenance practices to prevent fractures in mechanical components of the "CYMEMATIC CHAIN FOR OPERATION OF THE SD ”.

3. The Service Letter 737-SL-32-057-E “FRACTURES in LOWER Torsion Link”, makes it difficult to an adequate interpretation; which could be misleading to choose the AMM Task corresponding and determine their scope.

Recommendations

The CIAA issues the following Operational Safety Recommendations, the same as those should be extended to all Boeing 737-300 / 400/500 aircraft operators approved by the DGAC, in order to carry out an early and comprehensive detection of damage or wear, in the mechanical components of the "KINEMATIC CHAIN FOR OPERATION OF THE «SHIMMY DAMPER - SD» ”, whose measurements are out of tolerance. (See report for full list).