(b)
Set rudder trim knob to zero.
(c)
Set rudder pedal to the midposition. 1) Turn the rudder pedal adjustment crank to move the rudder pedals full forward. 2) Turn the rudder pedal adjustment crank to move the rudder pedals full aft. Keep
a record of the number of turns. 3) Turn the rudder pedal adjustment crank half of the number turns forward. Measure at pedal pivot point. Mark this as position 1 on the doghouse.
(d)
Move captain's pedal adjustment to full forward, then move captain's left pedal forward until stop at forward quadrant is contacted and hold in that position. Measure at pedal pivot point. Mark this as position 2 on rudder pedal doghouse.
(e)
Measure total forward travel of left pedal. (From position 1 to position 2). Total forward travel shall be 6.86 inches minimum.
(f)
Repeat steps (c) thru (e) with captain's right pedal.
(g)
Move captain's pedal adjustment to full aft, then move captain's left pedal forward until stop at forward quadrant is contacted and hold in that position. Measure at right pedal pivot point. Mark this as position 3 on rudder pedal doghouse.
(h)
Measure total aft travel of right pedal. (From position 1 to position 3). Total aft travel shall be 6.89 inches minimum.
(i)
Repeat steps (g) and (h) moving captain's right pedal forward and measuring total aft travel of captain's left pedal.
(j)
Repeat steps (b) thru (i) with first officer's pedals.
(2)
Test rudder hinge and power control unit bearing play.
(a)
Place rudder, rudder pedals and rudder trim knob in neutral position.
NOTE: Neutral rudder position is defined as position where both sides of rudder trailing edge are within width of tab on rudder index plate (Fig. 506).
(b)
Provide rudder systems A and B hydraulic power (Ref 27-21-0 MP).
(c)
Fix rudder pedals in neutral position, and check that they do not move during the following steps.
(d)
Mount dial indicator at lower end of rudder trailing edge.
(e)
Use rudder loading block to apply a force of 12 士4 pounds to left and release slowly.
CAUTION: WHEN MOVING RUDDER SURFACE BY EXTERNAL FORCE, ALWAYS USE LOADING BLOCK TO PREVENT DAMAGE TO RUDDER. APPLY EXTERNAL FORCE APPROXIMATELY 46.9 INCHES FROM RUDDER HINGE LINE BETWEEN RUDDER STATIONS 13.33 and 31.65. DO NOT EXCEED A LOAD OF 50 POUNDS ON RUDDER AT ANY TIME.
(f)
Record rudder position on dial indicator.
(g)
Move rudder right with loading block using force of 12 士4 pounds and release slowly.
(h)
Record rudder position on dial indicator.
(i)
Distance between rudder positions in steps (f) and (h) shall not exceed 0.04 inch.
(j)
Move rudder left with loading block using force of 12 士4 pounds and release slowly.
(k)
Read rudder position on dial indicator. Rudder position shall be within 0.02 inch of step (f).
(l)
If difference between rudder positions recorded in steps (f) and (h) is greater than
0.04 inch, rudder hinge bearings and/or power control unit bearings have too much play. Correct this condition and repeat test.
(3)
Disconnect pushrod to nose wheel steering (Fig. 503).
NOTE: Nose gear steering need not be disconnected if airplane is jacked so that nose gear is fully extended.
(4)
Test rudder centering.
(a)
Provide rudder systems A and B hydraulic power (Ref 27-21-0 MP).
(b)
Move captain's left rudder pedal approximately 0.5 inch forward and release. Rudder shall return to neutral position.
NOTE: Neutral position is defined as position at which both sides of rudder trailing edge are within width of tab on rudder index plate.
(c)
Move captain's right rudder pedal approximately 0.5 inch forward and release. Rudder shall return to neutral position.
(d)
Position flight control switches A and B to OFF, then position either flight control switch A or B to STDBY RUD.
(e)
Move captain's left rudder pedal approximately 1 inch forward and release. Rudder shall return to within 1.25 inches from index.
(f)
Move captain's right rudder pedal approximately 1 inch forward and release. Rudder shall return to within 1.25 inches from index.
(g)
Position flight control switches A and B to A ON and B ON.
(5)
Test rudder pedal forces.
(a)
Provide rudder systems A and B hydraulic power (Ref 27-21-0).
(b)
With rudder pedals in neutral, set captain's and first officer's pedal adjustment to midposition.
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本文链接地址：737 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 1(115)
