December 7, 2021

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Tour CRJ900’s nose-wheel steering reversed by incorrect maintenance | News

3 min read

Swedish investigators have found that incorrect set up of a Bombardier CRJ900’s nose-wheel steering sensor resulted in rudder-pedal deflection inputs becoming reversed, ahead of the jet suffered an tour throughout consider-off from Gallivare.

The Nordica aircraft experienced been departing runway 30 for a provider to Stockholm on 9 September very last 12 months. Its crew experienced been mindful that maintenance had been carried out on the nose-wheel steering program the working day just before.

While the crew experienced taxied the CRJ900 to the runway, the plane “immediately” turned still left just after the brakes had been produced and the jet commenced to roll for get-off.

The captain tried using employing the proper rudder pedal to right the class but was unsuccessful, and aborted the roll, the aircraft eventually halting with its nose-wheel exterior the runway.

“Flight info showed that nose-wheel steering with the rudder pedals steered the aircraft in the opposite route from that envisioned,” says Swedish incident investigation authority SHK.

Servicing experienced been carried out on the past day, next a number of technological remarks pertaining to the steering, describing how the nose-wheel was not centred following the jet had been parked without having electricity.

When a taxi examination uncovered the aircraft was steering to the remaining, without the need of correction, the carrier’s servicing organisation opted to switch the rudder-regulate sensor.

SHK claims the sensor on the aircraft (ES-ACD) was taken from a sister aircraft (ES-ACB). The technician doing the function informed the inquiry it was his 1st time changing the ingredient.

Investigators discovered that the sensor structure provided a spline which experienced mistakenly been inserted 90° clockwise from its right posture, a circumstance built attainable by a damaged clockwise quit in the component.

SHK says this intended the sensor could be wrongly equipped without any method warnings, but that this would reverse the polarity of the electrical output and cause a reversal of the rudder-pedal nose-wheel steering.

“The upkeep handbook did not explain that a verification of the sensor function should be executed in advance of installation,” it says, including that the guide also “lacked a crystal clear description” of how the sensor shaft need to be aligned when equipped.

“After set up of the sensor, neither the steering direction nor the angle of the deflection was confirmed all through a function examination of the nose-wheel steering with the rudder pedals.”

SHK claims the technician filmed a steering test on his phone, throughout which he sat in the cockpit turning the nose-wheel tiller. The film confirmed the steering linkage shifting in each instructions.

But even though he pressed the rudder pedals to verify the steering vary, he did not movie the steering deflections. SHK suggests the technician “assumed” the steering labored.

The CRJ900’s style certification has been transferred from Bombardier to Japan’s MHI RJ Aviation, which compiled specifics of 4 incidents due to the fact 2015 involving reversed rudder-pedal steering, two of which – which includes the Nordica occasion – occurred previous calendar year in the area of a month.

MHI RJ has launched temporary revisions to the plane maintenance guide concerning the elimination, rigging and useful test of rudder-management sensors, which includes clarifications of treatments, added methods, and improvements to illustrations.

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