(7) If the NLG torque link plays are correct, do the adjustment of the nose wheel "zero" position:
(a) with the NOSE WHEEL ALIGNMENT TOOL (JT2000AIRBUS) as reference if the tool is available
- Do a check of the NWS "zero" position (Ref. AMM TASK 32-51-00-220-001). If the nose wheels offset as shown on the tool display is out tolerance (more than plus or minus 0.5 degree), do the adjustment of the NWS "zero" position. (Ref. AMM TASK 32-51-00-820-003) and do the step (c).
NOTE : There are possible causes of undemanded steering during
____ taxi other a mechanical offset of the nose wheels. Thus if the NWS angle is correct as shown on the tool display, then it will be necessary to do the tawiway test to get an accurate rudder trim figure.
(b) With the rudder trim figure as reference if the LASER ALIGNMENT TOOL is not available or if the nose wheels offset as shown on the tool display is within tolerance:
- Do the taxi check procedure to get an accurate rudder trim figure.
1 Align the aircraft on the centerline.
_
2 Make sure that the engines operate at the same power level.
_
3 Release the parking brake.
_
4 Let the aircraft roll with the rudder pedals or the N/WS
_ handwheels along the centerline. When the aircraft is aligned, release the rudder pedals and the N/WS handwheels then continue the taxi without input to make an estimate of the deviation.
NOTE : The speed must be between 10 and 15 kts.
____
5 Align the aircraft again on the centerline with the rudder
_ pedals or the N/WS handwheels.
6 Give a rudder trim input opposite the aircraft deviation.
_ NOTE : Give the rudder trim inputs 1 degree by 1 degree, then
____ 0.5 degree by 0.5 degree to get a fine adjustment.
7 Do again the procedure and make an estimate of the new
_
deviation.
8 Align the aircraft again on the centerline and do again this
_ procedure until the aircraft goes straight.Then record the rudder trim value X1.
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9 Do the same procedure on the same taxiway in the opposite
_ direction. Then record the trim value X2.
NOTE : The procedure is done in each direction to make sure
____ that the effects of cross-winds and/or runway cambers are not included.
10 Calculate the average X of the two values X1 and X2 that you
__ measured: X = (X1 + X2)/2 Examples: X1 = +3.5 degree (L), X2 = +4.1 degree (L) X = (+3.5 + 4.1)/2 = +3.8 degree (L) X1 = +6 degree (L), X2 = -2 degree (R) X = (+6 - 2)/2 = +2 degree (L)
11 Do the adjustment of the NWS "zero" position (Ref. AMM TASK
__
32-51-00-820-001).
(c) Return the aircraft to service and make a record in the aircraft log book to monitor the NWS during the next taxi operation and to assess the aircraft lateral deviation, if any, using the rudder trim input.
1 Refer to the Close-Up part (5.A) and do the relevant steps.
_
(8) If the fault continues:
- If the adjustment of the NWS Zero Position was done with the ALIGNMENT TOOL-NOSE WHEEL (JT2000AIRBUS), do step (7)(b).
(9) If the fault continues after the gearbox was adjusted with the rudder trim angle as reference, replace the gearbox (3GC) Nose Wheel Steering gearbox (Ref. AMM TASK 32-51-41-000-001) and (Ref. AMM TASK 32-51-41-400-001).
R **ON A/C 005-049, 055-099, 101-105, 151-199, 201-220, 301-399,
R E. Procedure
R (1) Depressurize the green hydraulic system (Ref. AMM TASK 29-10-00-864-R 001).
R NOTE : Use the results table to help you record the different values
____ R thru the procedure that follows. R (Ref. Fig. 201/TASK 32-51-00-991-006-A)
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊(cè) 起落架 LANDING GEAR 2(118)
