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- Elevator Mt (mm.kg) = 400 (mm) x -Am (kg)
8) Check that the value of the balance moment is within the permissible tolerances.
CONTROL SURFACE BALANCE MOMENT
Min. Max.
mm.kg
in.lbs mm.kg
in.lbs
Elevator - 150 - 13 74 6.42
9) Re-adjust the elevator balancing if necessary - refer to Paragraph 2.
E. Rudder balancing check procedure (Figure 604)
1) Install rudder template (1) on scale (2), then zero the scale.
2) Install rudder (3) on balancing posts (4), the rudder resting on its hinge pins (two operators are required).
3) Position the rudder trailing edge on rudder template (1).
4) Measure the distance between the hinge axis and rudder template (1) (horizontal chord). It must be equal to 11.81 in (300 mm). Adjust rudder template (1) position if necessary.
ABAA
Validity : S / N 1 - 9999 51 60-00Page 602
(CA) OCT 02
5) Perform the weighing (Am) and calculate the balance moment which must be :
- Rudder Mt (in.lbs) = 11.81 (in) x Am (Ibs)
- Rudder Mt (mm.kg) = 300 (mm) x Am (kg)
6) Check that the value of the balance moment is within the permissible tolerances.
CONTROL SURFACE BALANCE MOMENT
Min. Max.
mm.kg
in.lbs mm.kg
in.lbs
Rudder 40 3.47 120 10.41
7) Re-adjust the rudder balancing if necessary - refer to Paragraph 2. 2. BALANCING RE-ADJUSTMENT (Figures 605, 606 and 607)
NOTE : In case of unsatisfactorily-balanced control surface, first check if unbalance can be attributed to a nonconforming repair or painting. It is possible to re-adjust balancing to a small extent.
A. Tools and consumable materials
None
B. Elevator balancing re-adjustment procedure
1) Invert the balance weight to increase the balance moment - refer to Figure 605.
CAUTION : DO NOT EXCEED THE MINIMUM VALUE OF BALANCE WEIGHT - REFER TO 55-20-00.
2) Drill holes (3 maximum) or remove material from the balance weight to increase the balance moment -refer to Figure 606.
NOTE : Make sure enough material remains between the attachment holes and the lightening holes - minimum 0.31 in (8 mm).
NOTE : A drilling depth of 0.4 in (10 mm) with a drill dia. # X (10 mm) corresponds to a weight loss of 0.02 lbs (9 g).
CAUTION : DO NOT EXCEED THE MAXIMUM VALUE OF BALANCE WEIGHT - REFER TO 55-20-00.
3) If necessary, add a steel washer to the balance weight to reduce the balance moment - refer to Figure 607.
NOTE : Make sure the attachment bolts are long enough after addition of the washer. If they have to be replaced - refer to the Illustrated Parts Catalog.
4) Make sure balancing is correct - refer to Paragraph 1.
C. Rudder balancing re-adjustment procedure
CAUTION : DO NOT EXCEED THE MINIMUM VALUE OF BALANCE WEIGHT - REFER TO 55-40-00.
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