A
A
I
I
R
R
P
P
L
L
A
A
N
N
E
E
T
T
E
E
C
C
H
H
N
N
I
I
C
C
A
A
L
L
D
D
E
E
S
S
C
C
R
R
I
I
P
P
T
T
I
I
O
O
N
N
,
,
O
O
P
P
E
E
R
R
A
A
T
T
I
I
N
N
G
G
,
,
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
A
A
N
N
D
D
R
R
E
E
P
P
A
A
I
I
R
R
M
M
A
A
N
N
U
U
A
A
L
L
3-20
Document No.:
EV97SLNOEN
Date of Issue:
02/2008
Revision:
-
3.4.6 Trim tab deflections measurement
The trim tab deflection is measured from the neutral position. When the trim tab profile does not
protrude from the elevator profile with elevator set in neutral position.
Measurement procedure:
1. Attach a protractor with a deflection hand at the trim tab
2. Neutralize the trim tab and the elevator
3. Zero the protractor
4. Set the trim tab in maximum lower or upper position using the trim tab control lever and read
the deflection from the protractor scale.
5. Compare the deflection with that specified in the Control Surfaces Deflection Record. If
required - adjust trim tab deflection according to the par. 4.11.5.
6. Check tension of trim tab control cables according to the following procedures:
Block elevator against to movement and trim tab control lever set to the neutral position. Apply
a load of 20 N (preferably according to a dynamometer) to the trim tab trailing edge. The trim
tab deflection musn
’
t exceed value of 5
+2
mm from the original position. If the trim tab
deflection exceeds this value, then it is neccessary to adjust trim tab cable preload by adjusting
screws.
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 elevator and the trim tab and
hold the cardboard against the elevator.
2. Trace the profile of the neutralized trim tab
3. Move the trim tab to the maximum (both directions) using the trim tab control lever and trace
the profile again
4. Remove the carboard and measure the deflection from the neutral position using a protractor
5. Compare the deflection with that specified in the Control Surfaces Deflection Record. If
required - adjust trim tab deflections according to the par. 4.11.5.
6. Check tension of trim tab control cables according to the following procedures:
Block elevator against to movement and trim tab control lever set to the neutral position. Apply
a load of 20 N (preferably according to a dynamometer) to the trim tab trailing edge. The trim
tab deflection musn
’
t exceed value of 5
+2
mm from the original position. If the trim tab
deflection exceeds this value, then it is neccessary to adjust trim tab cable preload by adjusting
screws.
