Theiceman,
I recommend you and your source to read the preliminary report from
Accident Investigation Board Denmark
http://www.hcl.dk/graphics/Synkron-L...d%20header.pdf
"
Examination of the internal threads of the retraction/extension actuator piston revealed the presence of corrosion, which led to separation of the rod end from the piston. The separation contributed to the landing gear collapse. "
Why do you think Bombardier released the following after the investigations:
"Update On Inspection Procedures On Bombardier Q400 Main Landing Gear
Toronto, September 14, 2007
- Detailed inspection procedures sent to operators
On September 13, 2007, Bombardier issued an All-Operators Message (AOM) providing Q400 operators with detailed inspection procedures to address Transport Canada’s airworthiness directive related to the aircraft’s recent main landing gear issue. These inspection procedures were developed by Goodrich, the landing gear manufacturer, and approved by Bombardier.
The document issued to Q400 aircraft operators includes highly detailed procedures on how to inspect, repair the retract actuator if necessary, or replace it, as follows: - Disassemble the retract actuator and visually determine if any corrosion exists;
- If corrosion is found, options are available to operators to allow them to return the aircraft to revenue service. These range from removal of light corrosion and repairs of the affected unit, to the replacement of the retract actuator. All procedures require a thorough application of corrosion-inhibiting compound.
Furthermore, the document provides guidance for continued inspections of the retract actuator unit."