Technical data

13773-001
55-40
Page 530 Nov 2000
(o) Carefully place rudder assembly onto knife edge supports and determine if a static over-
balance (leading edge heavy) or static underbalance (trailing edge heavy) condition
exists.
Note: If chord line mark is parallel to balance arm without any additional weight
the rudder assembly is balanced.
If the balance arm and the chord line mark can be made parallel by placing
a 10 ounce weight on or within the balance zone reference lines (estab-
lished in steps (f) and (g) above), the rudder assembly is said to be bal-
anced. No further action is necessary.
(p) To balance a rudder that is under balanced (trailing edge heavy), proceed to the following
steps.
CAUTION: When balancing the rudder, the rudder assembly must be complete, includ-
ing mounting brackets, paint, stripes, rudder bottom, and rudder tip. The
bench used to support the knife edge supports must be level. Before bal-
ancing, ensure there are no drafts in the balancing room, which can deflect
the surface from its balanced condition. Maximum mass balance weight is
2.5 pounds.
1
Place weight directly above the lead washer mount in the rudder horn until the chord
line and balance arm marks are parallel.
2
Remove safety wire and lead washer mounting bolts along with all balance material.
3
Place all required balance material into position and secure the lead washer mount-
ing bolts.
4
Safety wire lead washer mounting bolts. (Refer to 20-50)
(q) To balance a rudder that is over balanced (leading edge heavy), proceed with the follow-
ing steps.
CAUTION: When balancing the rudder, the rudder assembly must be complete includ-
ing mounting brackets, paint, stripes, rudder bottom, and rudder tip. The
bench used to support the knife edge supports must be level. Before bal-
ancing, ensure there are no drafts in the balancing room, which can deflect
the surface from its balanced condition. Maximum mass balance weight is
2.5 pounds.
1
Remove balance material from lead washer mounting bolts (as required) to achieve
alignment of the chord line to the balance arm.
2
Place all required balance material into position and secure lead washer mounting
bolts.
3
Safety wire lead washer mounting bolts. (Refer to 20-50)
(r) Install rudder. (Refer to 55-40)
(s) Operate the rudder and inspect for proper operation.
(6) Inspection/Check - Rudder
(a) Verify hinge bolts for proper torque and installation. (Refer to 55-40)
(b) Verify proper installation of safety wire and cotter pins on all fasteners.
(c) Ensure rudder skin is smooth and free of any defects or irregularities.
(d) Inspect rivets and rudder skin for tightness.
(e) Operate rudder controls and inspect for any abnormal resistance.