AIRPLANES PRE-SB 27-1252
1. Equipment and Materials
A. Rigging Pins Kit - F70207-3, -52, -61, or -84:
REF NO. F70207-( ) DIAMETER (INCHES) LENGTH (INCHES) FUNCTION
R-5 -11 0.309-0.311 6.7 +0.25 Feel and Centering Mechanism
2. Rudder Control Torque Tube Adjustment
A. Provide rudder systems A and B hydraulic power (Ref 27-21-0 MP).
B. Adjust rudder power control unit as follows:
(1)
Install rigging pin R-5 in feel and centering unit output crank and place rudder trim control wheel in neutral position.
(2)
Check location of rudder trailing edge with respect to rudder index tab (Fig. 501). Place a straight edge against side of rudder at trailing edge. If both sides of trailing edge fal1 within width of rudder index tab, tighten both checknuts on vernier control rod (Fig. 502). Combined total number of visible threads on sleeve and rod end shall not exceed 27 turns.
(3)
If either side of rudder trailing edge is outside index tab, but less than 0.50 inch from nearest side of tab proceed as follows:
(a)
Loosen both checknuts on vernier control rod.
(b)
Turn sleeve to obtain small amounts of right or left rudder until both sides of trailing edge fall within width of index tab.
(c)
Tighten both checknuts and check that combined total number of visible threads on sleeve and rod end does not exceed 27 turns.
(4)
If either side of rudder trailing edge is outside of index tab more than 0.50 inch from nearest side of index tab, proceed as follows:
(a)
Position flight control switches A and B to OFF.
CAUTION: RUDDER POWER MUST BE OFF BEFORE DISCONNECTING VERNIER CONTROL ROD.
(b)
Loosen both checknuts on vernier control rod and remove clevis bolt from forward end.
May 01/03 27-21-72 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G09478 G13658
Rudder Travel and Index Plate 503
27-21-72Page 502 Figure 501 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 1/74
501 Rudder Aft Control Mechanism Adjustment
Aug 15/69 Figure 502 27-21-72
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(c)
Adjust rod assembly length by holding sleeve and rod end together relative to tube. Then turn rod end relative to sleeve an equal number of turns in same direction. One-half turn is equivalent to approximately 1/2 inch of rudder movement at trailing edge. Lengthen assembly for right rudder, and shorten for left rudder.
(d)
Position rod end to actuator input crank and install clevis bolt, washers, and nuts. Tighten nut on outer bolt to 50-65 pound-inches, then tighten nut on inner bolt to 12-15 pound-inches.
CAUTION: AFTER TIGHTENING NUT ON INNER BOLT, DO NOT RESET TORQUE FOR NUT ON OUTER BOLT. NUT ON INNER BOLT MAY BECOME LOOSE.
(e)
Position flight control switches A and B to ON.
(f)
Turn vernier control rod sleeve until both sides of rudder trailing edge fall within width of rudder index tab.
(g)
Tighten both checknuts on vernier control rod. Combined total number of visible threads on sleeve and rod end shall not exceed 27 turns.
(h)
Remove rigging pin R-5.
C. Adjust standby rudder actuator.
(1)
Check that rudder systems A and B hydraulic power is provided and flight control switches A and B are ON. Refer to 27-21-0.
(2)
Check that rudder trim is set at zero units of trim.
CAUTION: PERSONNEL SHOULD STAND CLEAR OF ALL FLIGHT CONTROL
SURFACES WHEN HYDRAULIC POWER IS APPLIED.
(3)
Jiggle feel and centering unit input arm (trim and feel rod) to ensure that system is centered.
(4)
Insert rigging pin R-5 in centering unit output crank. Rigging pin shall enter easily without movement of output crank.
(5)
Check alignment of index mark on standby actuator valve input crank and center mark on actuator body. (See detail A, figure 502.)
(a)
If marks align, proceed to step (8).
(b)
If marks do not align but misalignment is less than 0.02 inch, proceed to step (6).
(c)
If marks do not align and misalignment is more than 0.02 inch, proceed to step (7).
(6)
Adjust control rod (fine adjustment) as follows:
(a)
Loosen both checknuts on rod assembly and back them off a few turns.
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