R (d) Open the circuit breaker 2GG and close the circuit breakers 1GG,
R 3GG and 4GG (the BSCU CHAN 2 is in command).
R (e) On the MCDU, get the STEERING DATA page for the BSCU CHAN 2:
R - On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent
R to the BSCU2 indication.
R - On the BSCU CHAN 2 page, push the line key adjacent to the
R SPECIFIC DATA indication.
R - On the BSCU CHAN 2/SPECIFIC DATA page, push the line key
R adjacent to the STEERING DATA indication.
R (f) On the MCDU on the STEERING DATA page :
R - Push the line key adjacent to the REFRESH indication and make
R sure that the STRSELV parameter shows CLOSED.
R - Record the servovalve current ISTRSV parameter (ISV6).
R (g) On the nose wheels deactivation electrical box 5GC, set the lever
R to normal.
R (h) Close the circuit breaker 2GG
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R (i) Make sure that the value of (Isv5-Isv6) is less than or equal to
R plus or minus 1.92 mA.
R (j) If the value is not correct:
R - replace the BSCU (10GG) (Ref. AMM TASK 32-42-34-000-001) and
R (Ref. AMM TASK 32-42-34-400-001).
R (k) Do steps (a) thru (i) again and do step (l).
R (l) Return the aircraft to service and make a record in the aircraft
R log book to monitor the NWS durint the next taxi operation and to
R assess the aircraft lateral deviation, if any, using the rudder
R trim input.
R 1_ Refer to the Close-Up part (5.A) and do the relevant steps.
R (5) If the BSCU output is correct, do a check of the NWS angle 3GC value
R with the NLG centering cams as reference.
R (a) Jack up the front of the aircraft (Ref. AMM TASK 07-11-00-581-R 003).
R NOTE : In the fully extended position of the shock absorber, the
____ R NLG is automatically centered (the nose wheel steering is R in the zero position).
R (b) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-R 864-002).
R (c) On the MCDU on the STEERING DATA page of the BSCU CHAN 1(CHAN 2):
R - Push the line key adjacent to the REFRESH indication,
R - Record the RVDTCOM value.
R (d) Make sure that RVDTCOM value is less than or equal to 0 deg. plus
R or minus 0.5 deg. for the BSCU CHAN 1 and BSCU CHAN 2.
R (e) If the NWS angle is not correct for the BSCU CHAN 1 and/or BSCU
R CHAN 2:
R - Do a check of the voltage at the nose wheel steering feedback
R sensor 3GC (Ref. AMM TASK 32-51-19-220-001).
R 1_ If the voltage is out of the specified limits, do the
R adjustment of the nose wheel steering "zero" position with the
R NLG centering cams as reference (Ref. AMM TASK 32-51-00-820-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.
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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.
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.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(133)
