|Title:||Main landing gear collapse on landing, Douglas Aircraft Company MD-83, G-DEVR|
|Micro summary:||The main landing gear of this Douglas Aircraft Company MD-83 collapsed during landing roll.|
|Event Time:||1995-04-27 at 2316 UTC|
|Publishing Agency:||Aircraft Accident Investigation Board (AAIB)|
|Publishing Country:||United Kingdom|
|Site of event:||Landing, Manchester|
|Departure:||Gran Canaria (Las Palmas) International Airport, Gran Canaria Island, Spain|
|Destination:||Birmingham International Airport, West Midlands, England|
|Airplane Type(s):||McDonnell Douglas DC-9-83 (MD-83)|
|Type of flight:||Revenue|
|Executive Summary:||The aircraft landed at Manchester at 2316 hrs and the commander took control from the first officer during the latter part of the landing roll. As he applied increased pressure to the brakes there was a loud bang and the left wing dropped as the left Main Landing Gear (MLG) collapsed. The aircraft came quickly to a halt and the commander decided to disembark the passengers via the front passenger entrance door and stairs. The cabin supervisor experienced a problem with the stairs and, after a discussion with the commander, the passengers were evacuated via the front and rear service doors using the escape slides. An orderly evacuation ensued with only minor injuries being sustained; all passengers had left the aircraft by 2326 hrs. |
The investigation identified the following causal factors:-
(1) The left MLG outer cylinder failed on the application of bending loads resulting from normal braking due to the presence of a fatigue crack, 5 mm long by 1.25 mm deep, located on the front face of the cylinder, close to a change in section, where bending stresses were maximum.
(2) The fatigue origin was associated with surface features produced by the gritblasting used to prepare the steel surface for high current density cadmium plating.
(3) Loads not predicted during the MLG design were encountered early in the aircraft's life when 'gear walking', a MLG fore and aft vibration mode, was encountered. As a result fatigue initiated and propagated through the immediate compressive subsurface layer produced by shot peening and designed to improve fatigue resistance.
Two safety recommendations are made.
|Learning Keywords:||Operations - Bang, pop, crack, sizzle!|
|Operations - Evacuation|
|Operations - Maintenance|
|Systems - Landing Gear|
|Systems - Landing Gear - MLG Collapse|
|Other - Manufacturing Issues|
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