Alaska Airlines has said the jackscrew
failed because of extreme wear caused by a kind of grease recommended by Boeing.
Cutting Oil Improves Machining Of Stainless Steel Jackscrew
Alaska Airlines grounded 17 of its 34 MD-80 aircraft late last week in order to conduct inspections of the aircraft's jackscrew
with a tool made by Boeing Co, the US aircraft manufacturer.
To counter this potential bending, use an indicator on the top face of the part when installing the jackscrew
A draft report to be considered today by the National Transportation Safety Board blames insufficient lubrication for excessive wear and eventual failure of the MD-80's jackscrew
, which helps move the plane's stabilizer and sets the angle of flight.
Early evidence points to a worn jackscrew
mechanism, which would have given the pilots less control of the stabilizer.
The National Transportation Safety Board recently concluded that a lack of grease on a jackscrew
assembly controlling the tail-mounted horizontal stabiliser caused the crash.
Against the aircraft and parts manufacturers, the suits allege they were negligent in failing to properly and adequately warn against the defective and unreasonably dangerous conditions of this MD-83 aircraft and its component parts, including, among others, the jackscrew
and gimbal nut in the horizontal gimbal stabilizer, which malfunctioned during the flight.
carriers inspect all MD80s and DC-9s in their fleets to ensure the integrity of the jackscrew
assembly in the horizontal stabilizer mechanism.
According to the National Transportation Safety Board (NTSB), the MD-80 series aircraft's two-foot jackscrew
failed, causing the stabilizer to jam.
14 /PRNewswire/ -- Dallas-based Legend Airlines today announced it has inspected all of its DC-9 aircraft and found no discrepancies with the stabilizer jackscrew
They are available with latches, jackscrews
board mounts and can be used reliably with pick-and-place equipment.