(9) Adjust the input rod to the standby rudder actuator.
(a)
Make sure that the main rudder power control unit is adjusted correctly.
WARNING: RUDDER, ELEVATOR, AND AILERONS ARE FULLY POWERED SYSTEMS. ALL THREE SYSTEMS ARE POWERED SIMULTANEOUSLY. CHECK TO ENSURE THAT PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF ALL CONTROL SURFACES BEFORE TURNING POWER ON.
(b)
Provide rudder hydraulic systems A and B power (AMM 27-21-0/201).
(c)
Set the FLT CONTROL A and B switches to the STBY positions.
(d)
Move the rudder pedals through 5 cycles of full travel. 1) If necessary, jiggle the rudder pedals to put the pedals to the neutral positions.
(e)
Check that rudder trim is set at zero units of trim.
(f)
Make sure that you can install the rig pin R-5 freely (Fig. 504).
1) If necessary, jiggle the output crank of the feel and centering unit so that the rig pin R-5 can be installed freely.
(g)
Remove the rig pin R-5.
(h)
Push the rudder trailing edge to the right side until it stops, then slowly remove the load. 1) Measure the distance from the rudder trailing edge to the index plate (Fig. 505).
Record this measurement as A.
(i)
Push the rudder trailing edge to the left side until it stops, then slowly remove the load. 1) Measure the distance from the rudder trailing edge to the index plate (Fig. 505).
Record this measurement as B.
(j)
Compare the rudder right (A) and left (B) measurements.
1) If the difference between A and B is 0.20 inch (5.1 millimeters) or less, no adjustment is necessary.
2) If the difference between A and B is 0.20 to 0.50 inch (5.1 to 12.7 millimeters), do the following steps to adjust the control rod: a) Loosen the two checknuts on both ends of the control rod so that you can
rotate the sleeve. b) If B is greater than A, turn the sleeve on the control rod counter-clockwise (looking forward) to make the rod shorter.
NOTE: One full turn of the sleeve moves the rudder trailing edge approximately 0.095 inch (2.4 millimeters).
c) If A is greater than B, turn the sleeve on the control rod clockwise (looking forward) to make the rod longer.
NOTE: One full turn of the sleeve moves the rudder trailing edge approximately 0.095 inch (2.4 millimeters).
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d) Tighten the two checknuts. e) Make sure that you can see the threads through the inspection holes at the two ends of the sleeve. f) Repeat the steps to measure the right and left distances and perform adjustment if necessary.
3) If the difference between A and B is more than 0.50 inch (12.7 millimeters), do the following steps to adjust the control rod: a) Set the FLT CONTROL A and B switches to OFF positions. b) Loosen the two checknuts on both ends of the control rod so that you can
rotate the sleeve. c) Remove the bolt that connect the aft end of the rod to the PCU. d) If B is greater than A, turn the sleeve and the rod-end clockwise (looking
forward) to make the rod shorter.
NOTE: Make sure that the sleeve and the rod-end rotate together at the same time. One full turn of the sleeve and rod-end together moves the rudder trailing edge approximately 0.54 inch (13.7 millimeters).
e) If A is greater than B, turn the sleeve and the rod-end counter-clockwise (looking forward) to make the rod longer.
NOTE: Make sure that the sleeve and the rod-end rotate together at the same time. One full turn of the sleeve and rod-end together moves the rudder trailing edge approximately 0.54 inch (13.7 millimeters).
f) Install the bolt to connect the rod to the PCU.
g) Set the FLT CONTROL A and B switches to STDBY positions.
h) Repeat the steps to measure the right and left distances and perform
adjustment if necessary. i) If no more adjustment is necessary, tighten the two checknuts on both ends of the control rod.
(k)
Set the FLT CONTROL A and B switches to ON positions.
(l)
Verify that the STBY RUD ON light on the P5-3 panel is not illuminated after 5 seconds.
(m)
Do a test of the rudder and rudder trim control system.
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2. Rudder and Rudder Trim Control System Test
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