A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(123)

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R  002). 
R  (f) If an adjustement of the NWS "zero" position with the centering 
R  cams as reference was done, return the aircraft to service and 
R  make a record in the aircraft log book to monitor the NWS during 
R  the next taxi operation and to assess the aircraft lateral 
R  deviation, if any, using the rudder trim input. 
R  1_  Refer to the Close-Up part (5.A) and do the relevant steps
R  (6) If the NWS ANGLE 3GC value is correct or if the voltage is in the 
R  specified limits, do an inspection/check of the NLG torque link plays 
R  (Ref. AMM TASK 32-21-00-200-003). 
R  (a) If the NLG torque link plays were adjusted, return the aircraft 
R  to service and make a record in the aircraft log book to monitor 
R  the NWS during the next taxi operation and to assess the aircraft 
R  lateral deviation, if any, using the rudder trim input. 
R  1_ Refer to the Close-Up part (5.A) and do the relevant steps

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R  (7) If the NLG torque link plays are correct, do the adjustment of the 
R  nose wheel "zero" position: 
R  (a) with the NOSE WHEEL ALIGNMENT TOOL (JT2000AIRBUS) as reference if 
R  the tool is available 
R  - Do a check of the NWS "zero" position (Ref. AMM TASK 32-51-00-
R  220-001). 
R  If the nose wheels offset as shown on the tool display is out 
R  tolerance (more than plus or minus 0.5 degree), do the 
R  adjustment of the NWS "zero" position. (Ref. AMM TASK 32-51-00-
R  820-003) and do the step (c). 
R  NOTE : There are possible causes of undemanded steering during____ 
R  taxi other a mechanical offset of the nose wheels. 
R  Thus if the NWS angle is correct as shown on the tool 
R  display, then it will be necessary to do the tawiway test 
R  to get an accurate rudder trim figure. 
R  (b) With the rudder trim figure as reference if the LASER ALIGNMENT 
R  TOOL is not available or if the nose wheels offset as shown on 
R  the tool display is within tolerance: 
R  - Do the taxi check procedure to get an accurate rudder trim 
R  figure. 
R  1_  Align the aircraft on the centerline.
R  2_  Make sure that the engines operate at the same power level.
R  3_  Release the parking brake.
R  4_  Let the aircraft roll with the rudder pedals or the N/WS
R  handwheels along the centerline. 
R  When the aircraft is aligned, release the rudder pedals and 
R  the N/WS handwheels then continue the taxi without input to 
R  make an estimate of the deviation. 
R  NOTE : The speed must be between 10 and 15 kts.____ 
R  5_  Align the aircraft again on the centerline with the rudder
R  pedals or the N/WS handwheels. 
R  6_  Give a rudder trim input opposite the aircraft deviation.
R  NOTE : Give the rudder trim inputs 1 degree by 1 degree, then____ 
R  0.5 degree by 0.5 degree to get a fine adjustment. 
R  7_  Do again the procedure and make an estimate of the new
R  deviation. 
R  8_  Align the aircraft again on the centerline and do again this
R  procedure until the aircraft goes straight.Then record the 
R  rudder trim value X1.

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R  9_  Do the same procedure on the same taxiway in the opposite
R  direction. 
R  Then record the trim value X2. 
R  NOTE : The procedure is done in each direction to make sure____ 
R  that the effects of cross-winds and/or runway cambers 
R  are not included. 
R  10__  Calculate the average X of the two values X1 and X2 that you
R  measured: 
R  X = (X1 + X2)/2 
R  Examples: 
R  X1 = +3.5 degree (L), X2 = +4.1 degree (L) 
R  X = (+3.5 + 4.1)/2 = +3.8 degree (L) 
R  X1 = +6 degree (L), X2 = -2 degree (R) 
R  X = (+6 - 2)/2 = +2 degree (L) 
　
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