Spoiler mixer bearing wear due to sand contamination 737-6/7/8/900

Due to repetitive speed brake actuator malfunctioning (found burns) on 737NG of

our fleet, and also a hardness of speed brake mechanism, an inspection has

been carried out of the spoiler mechanism, which lead us to incriminate the

spoiler mixer, therefore it has been sent to the workshop, the inspection

finds that:

1. A sand quantity inside the spoiler mixer (our fleet often operates in

the desert area’s).

2. Due to the sand the bearing (A) shown in pictures, was

found jammed therfore causing a frictional wear against its housing as shown

in picture (3).

3. Auto speed brake actuator malfunctioning is the consequence of the hardness

of speed brake mechanism.

Many thanks for Makhloufi for this input.



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