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Due to possible failures in the tail rudder control provided by Collins Aerospace, The FAA recommended review of the Boeing 737of and 737 MAX.
The National Transportation Safety Board (NTSB) has issued urgent security recommendations to The Boeing Company and the Federal Aviation Administration (FAA) following an incident involving a possible jamming of the rudder control system on a Boeing 737-8 from United while taking off in Newark.
The incident, that occurred during the braking process after landing at Newark Liberty International Airport, has led the NTSB to investigate the underlying causes and possible risks associated with this problem.
Details of the incident and investigation on the 737NG and MAX
The NTSB is investigating an incident 6 February 2024 which involved a Boeing 737 MAX 8 de United Airlines. During landing taxi, the rudder pedals were “stuck” in their neutral position, which made it difficult for the pilot to control the direction of the plane. Fortunately, the captain was able to use the front wheel rudder to maintain control and avoid any serious consequences.
Further investigation revealed that moisture had accumulated inside the rudder guidance actuators., which compromised its functionality. This problem can be traced back to a manufacturing error that left the actuators susceptible to moisture ingress..
NTSB investigators tested one of the crashed plane's rudder control components, a guide actuator, at the component manufacturer, Collins Aerospace. When the incident actuator and an identical unit from another aircraft were tested in a cold environment, the function of the actuators was significantly compromised.
Investigators found evidence of moisture on both actuators, who did not pass the test. Collins Aerospace later determined that a sealing component was incorrectly assembled during production of the actuators, which left the unsealed side more susceptible to moisture which can freeze and limit movement of the rudder system.
Collins notified Boeing that more than 353 actuators that Collins had delivered to the manufacturer since February 2017, were affected by this condition.
Rudder launch guide actuator, which is installed in the tail of some Boeing 737NG and 737MAX aircraft, It is designed to control rudder movement during approach operations, landing and taxiing in category IIIB. Although it is not used in non-precision landings, the actuator remains mechanically coupled to the rudder system.
The flight manual 737 from Boeing instructs pilots faced with a stuck or restricted rudder to “master the stuck or restricted system” [using] maximum force, including a combined effort of both pilots”. The NTSB expressed concern that this amount of force applied during landing or takeoff could result in large input into the rudder pedals and a sudden deflection., large and unwanted rudder that could inadvertently cause loss of control or departure from the runway.
security recommendations
In light of these findings, The NTSB has issued several safety recommendations to Boeing and the FAA. These recommendations include:
Boeing:
- Determine additional flight crew responses to stuck or restricted rudder situations beyond applying maximum pedal force.
- Notify operating flight crews 737 with actuators affected by the potential for jamming due to moisture.
FAA:
- Evaluate whether actuators with incorrectly assembled bearings should be removed from aircraft.
- If required, instruct US operators to remove affected actuators until replacements are available.
- Notify aviation regulators in other countries about the problem and encourage them to take similar action.
NTSB investigation into possible rudder control problems in airplanes Boeing 737 highlights the importance of continuous safety monitoring and proactive measures to prevent accidents. The recommendations issued by the NTSB are critical steps to address this safety concern and ensure the continued safe operation of these airplanes..
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