during take off and landing at 40-70 knot speed SHIMMY.....
Again shimmy , during take off, shimmy starts 40 knots continuing until 70 knot and at landing starts 70 knot stops at 40 knots.
upper and lower torgue arm are tight.tire pressure 60 psi and same level.tires condition good. nlg door rigged.steering control valf normal.fulcrum bearing replaced.steering cable tension checked.
there is no any fault at nlg .
PLEASE SEND ANY ANSWERS. PRIORTY 01.