`` Kumas '' s lookouts soon spotted Know the torpedoes ' wakes , and Captain Sugino shifted Change his rudder hard over .

Fuel leaking Motion from these damaged Damaging lines ignited Lighting , causing Causation a large fire which then destroyed Destroying components that controlled Control the elevators and rudder , resulting in Causation the pilots losing Earnings_and_losses control Control of the aircraft .

The jamming of the rudder control Control cable caused Causation the rudder to deflect Motion to its maximum right position .

The jamming of the rudder control Control cable caused Causation the rudder to deflect Motion to its maximum right position .

In December 2015 , the Indonesian National Transportation Safety Committee ( KNKT or NTSC ) released Publishing a report Reporting concluding Protest that a non-critical malfunction in the rudder control Control system prompted Cause_change_of_position_on_a_scale the captain to perform Hold a non-standard reset of the on-board flight control Control computers .

Another potential factor that led to Causation the crash Catastrophe of the 737 aircraft was the power control unit ( PCU ) that controlled Control the aircraft 's rudder .

The cause of some 737 crashes , such as USAir Flight 427 , had been attributed Causation to the 737 's rudder issues Creating .

although the ntsb and pcu manufacturer parker hannifin had already determined Deciding that the pcu was properly working Employment , and thus not the cause of the crash , a private investigation into the crash for a civil lawsuit Legality tried by jury in a state court in los angeles , which was not allowed Preventing_or_letting to hear or consider the ntsb 's and parker hannifin 's conclusions Statement , decided Deciding that the crash was caused Causation by a defective servo valve inside the pcu , based on forensic findings from an electron microscope which determined Deciding that minute defects within the pcu had caused Causation the rudder unk and a subsequent uncontrollable flight and crash Catastrophe .

The manufacturer of the aircraft 's rudder controls Control and the families later reached Arriving an out-of-court settlement Resolve_problem .