Technical data

13773-001

57-50

Page 2 30 Nov 2000

To balance the aileron, the assembly must be painted and complete, including all attaching hard-

ware.

WARNING:

Before balancing, ensure no breeze or drafts are in balancing room. Maxi-

mum allowable mass balance is 1.05 pound at each mass balance location.

(a) Acquire necessary tools, equipment, and supplies.

(b) Remove aileron. (Refer to 57-50)

Note: The mass balance weight must be removed for the following procedure.

(d) Mark the chord line on the inboard rib shear web.

Note: The chord line is defined as the line extending from the trailing edge

through the hinge line. It is perpendicular to the spar.

(e) Place the complete assembly on knife-edge supports and determine if a static overbal-

ance (leading edge heavy) or static underbalance (trailing edge heavy) condition exists.

(f) To determine the amount of static underbalance (trailing edge heavy), attach a paper cup

to one end of a short, small diameter string. Secure the string with masking tape to the

leading edge of the aileron. The paper cup should hang vertical without contact. Add the

mounting hardware in the paper cup.

WARNING:

Maximum allowable mass balance is 1.05 pound at each mass balance

location.

(g) Add weight in the cup until the aileron balances with the aileron chord line level. Check

this by holding a spirit level aligned with the chord line.

(h) Remove the string, cup and its contents. Weigh them to the smallest calibration possible

with the scale being used.

(i) Weigh the aileron mounting hardware and mass balance weight.

CAUTION: Each mounting location has a maximum mass balance weight of 1.05

pounds.

(j) Add or remove weight as necessary to achieve the total predetermined weight needed to

balance the aileron.

Description P/N or Spec. Supplier Purpose

Knife edge supports - Any Source Balance aileron

Scale - Any Source Balance aileron

Safety wire MS20995C32 Any Source Retain part

Lead washer 12682-001 Cirrus Design Balance aileron