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3-18
Document No.:
EV97SLNOEN
Date of Issue:
02/2008
Revision:
-
3.4.2 Aileron deflection measurement
Measurement procedure:
1. Attach a protractor with a deflection hand at the aileron upper surface by means of a clamp.
2. Set the aileron in neutral position (the aileron must fit the wing profile).
3. Zero the protractor - starting position for measurement .
4. Deflect the aileron fully down/up and note the deflections.
5. Compare, the measured deflections with the ones specified in the Control Surfaces Deflection
Record. If required - adjust the aileron deflection according to par. 4.11.1 .
If a protractor is not available, the following procedure may be substituted:
1. Insert a stiff cardboard sheet of paper in the space between the aileron and the flap. Hold the
drawing paper against the flap.
2. Put the aileron in a neutral position. Then trace its profile (upper surface from the hinge to the
trailing edge). Then trace the profile of the aileron fully deflected in both directions.
3. Remove the drawing paper and measure the deflection from the neutral position using a
protractor.
4. Compare the measured deflections with those specified in the Control Surfaces Deflection
Record. If required - adjust the aileron deflection according to 4.11.1.
3.4.3 Flap deflection measurement
The wing flaps can be set in 4 positions: RETRACTED, TAKEOFF, LANDING (2 positions).
Measurement procedure:
1. Cut a strip of aluminium sheet 2 inches (50 mm) wide. The strip is than attached to the flap
lower surface with two bolts (somewhere in the middle of the flap span where two nuts are
riveted). The strip should overhang the flap trailing edge.
2. Attach a protractor with a deflection hand at the strip using a clamp.
3. Zero the protractor - this will be the starting position for measurement with the flaps retracted
4. Extend the flap to the required position using the flap control lever and read the deflection
5. Compare the measured deflections with those specified in the Control Surfaces Deflection
Record. If required - adjust flap deflection according to the par. 4.11.2.
If a protractor is not available, the following procedure may be substituted:
1. Insert a stiff cardboard sheet of paper in the space between the aileron and the flap. Hold the
drawing paper against the flap.
2. Trace the profile of the retracted flap on the lower surface from the hinge to the flap trailing
edge)
3. Move the flap to an extended position and trace the lower surface profile again
4. Remove the drawing paper and measure the deflection from the "RETRACTED" position using
a protractor
5. Compare the measured deflections with those specified in the Control Surfaces Deflection
Record. If required - adjust flap deflection according to the par. 4.11.2.