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Why it Happened :question: (Malfunction in aircraft rudder system (Failure…
Why it Happened :question:
Malfunction in aircraft rudder system
Failure at design/operational stages
Black, Francis, Hall & Hammerschmidt 1999
Previous incident on 3rd March 1991 United Airline 585 reported 2 rudder related issues two weeks before this accident
Failure at design/not communicated within industry
Black, Carmody, Goglia & Hammerschmidt 2001
Rudder had the potential to operate in the opposite direction as commanded by flight crew
Failure at design/testing/commissioning stages
Black, Francis, Hall & Hammerschmidt 1999
Main rudder power control unit servo secondary valve jammed
Equipment/Design Failure
Black, Francis, Hall & Hammerschmidt 1999
Flight crew not fully trained in recovery procedure for rudder reversal failure
Management/Procedures/Training/Policies Failure
Black, Francis, Hall & Hammerschmidt 1999
Tight clearances within the servo valve effected thermal components and hydraulic fluids
Equipment/Design/Testing Failure
Black, Francis, Hall & Hammerschmidt 1999
Rudder surface blowdown limits, causing jam when offset from their neutral position
System Design Failure
Black, Francis, Hall & Hammerschmidt 1999
The dual concentric servo valve is not reliably redundant
System Design Failure
Black, Francis, Hall & Hammerschmidt 1999
Flight data recording system failed to record enhanced information relating to rudder/standby rudder indicators to prevent reoccurrence and disrupt investigation analysis
Design/Equipment/Management Failure
Black, Francis, Hall & Hammerschmidt 1999
Air speed below block maneuvering speed, effecting flaps reducing controllability regarding rudder failure issues
Management/Training/Procedure Failure
Black, Francis, Hall & Hammersmith 1999