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The National Transportation Safety Board (NTSB) issued emergency safety recommendations Thursday to Boeing and the Federal Aviation Administration (FAA) in response to the possibility of a jammed or restricted pin control system on the 737 Next-Generation and 737 Max 8 airplanes.
The rudder controls the side-to-side movement of the aircraft’s nose, otherwise known as yaw motion.
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The agency is also investigating an incident in February in which the rudder of a United Airlines Boeing 737 Max 8 “stuck” in its neutral position during takeoff from Newark Liberty International Airport in New Jersey.
A United Boeing jet is parked at the gates of Newark Liberty International Airport in Newark, New Jersey on March 19, 2024. (Photographer: Angus Mordant/Bloomberg via Getty Images/Getty Images)
At the time, the captain had to rely on the nosewheel steering tiller to control the plane’s direction after touchdown, the NTSB said.
The pilots reported that the plane was able to taxi to the gate “without incident” and all 155 passengers and six crew members were able to get off. No injuries were reported.
| A ticker | Security | Finally | Change | Change % |
|---|---|---|---|---|
| BA | This company BOEING CO. | 156.30 | +1.81 |
+1.17% |
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As part of the investigation, NTSB investigators tested one of the rudder control components from the incident plane at the component’s manufacturer, Collins Aerospace.
After conducting tests in a cold environment, the investigators found that the function of the component was “highly compromised.” Collins Aerospace later discovered that the part had been assembled incorrectly during production.
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As part of the Boeing 737 flight manual, pilots with a jammed or restricted rudder are instructed to “overcome a jammed or restricted system [using] great strength, including the joint effort of both pilots.”
The recommendations come as a result of the throttle control system’s capabilities being crowded or limited on other 737 Next-Generation and 737 Max 8 aircraft. (Photos by Scott Olson/Getty Images)
However, NTSB investigators expressed concern that this amount of force applied during landing or takeoff “could cause significant input to the rudders and sudden, large, and unwanted deflection of the rudder that could result in loss of control or departure from the runway. .
Among its recommendations, the agency suggested that the aircraft manufacturer determine “appropriate responses of the flight crew without using excessive throttle” in such situations in flight or during landing.