Service difficulty report · Control Tube · Emb ERJ190100LR

Difficulty date
February 17, 2009
Submitted
April 9, 2009
Operation
General aviation
Make and model
Emb ERJ190100LR
Aircraft time
5,236 hours
Engine
Ge CF3410E5A1
Part
Control Tube
Condition
Bent
Location
Aileron
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) ACFT, AFTER COMPLETING REF/A/B, MX NOTICED BOTH THE LT AND RT AILERON TORQUE TUBE ASSEMBLIES WERE BENT. CABLES FOUND LOOSE UPON ARRIVAL. ALL AILERON CABLES TIGHTENED ACCORDING TO REF/A/AND/B/AND. DUE TO CURVATURE OF TUBES, CABLES ARE NOW SITTING LOWER IN THEIR RESPECTIVE BELLCRANKS. IF THE TUBE WERE TO BE STRAIGHT, THE CABLE WOULD BE CENTERED IN THE MIDDLE OF THE BELLCRANK. GIVEN THAT THEY ARE SITTING LWR, THE CABLES DO NOT SEEM TO BE WEARING ON THE LWR FLANGE OF THE BELLCRANKS. THE BEST METHOD TO MEASURE THE DEFLECTION WAS TO FIX A STRING TO THE CENTER OF THE TUBE AT UPPER SUPPORT AND THEN TO THE CENTER OF TUBE AT LOWER END. IF THE TUBE WERE STRAIGHT, STRING WOULD STAY IN CENTER OF THE TUBE OVER ENTIRE LENGTH. THIS WAS OBVIOUSLY NOT CASE IN THIS INSTANCE. AFTER MARKING APPROXIMATE CENTER OF THE TUBE WITH A PEN AT THE MIDWAY POINT ALONG LENGTH OF THE STRING, WE THEN MEASURED THE DISTANCE FROM THE MARKED CENTERLINE OF THE TUBE TO WHERE THE STRING WAS OFFSET. ALTHOUGH THIS MEASUREMENT IS ONLY APPROXIMATE, IT GIVES A ROUGH IDEA OF THE AMOUNT OF DEFLECTION IN EACH TUBE. THE DEFLECTION IN THE LT TUBE WAS MEASURED TO BE APPROX. 0.25 INCH, WHILE THE DEFLECTION IN THE RT TUBE WAS APPROX. 0.15 INCH. THE 2 OTHER ACFT CURRENTLY IN OUR HANGAR (MSN 19000019 & 17000090) ARE IN THE SAME CONDITION.

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