8 When movement of the nose wheels stops, on the MCDU on the
_
STEERING DATA page:
- Push the line key adjacent to the REFRESH indication.
- Record the servovalve current SSV CURRENT parameter (ISV2).
9 Do these checks:
_
- Make sure that 0.5 X (ISV1 + ISV2) is less than or equal to plus or minus 0.50 mA.
- Make sure that (ISV1 - ISV2) is less than or equal to plus or minus 0.50 mA.
- Make sure that ISV1 or ISV2 is less than or equal to plus or minus 0.50 mA.
10 If the servovalve currents are not correct:
__
- Replace the steering servovalve (Ref. AMM TASK 32-51-51-000-002) and (Ref. AMM TASK 32-51-51-400-002).
11 Do steps (1) to (9) again and do step (e).
__
(e) 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.
_
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-004, 051-054, ∞∞32-51-00∞∞∞∞∞∞∞∞∞∞Page 262
Aug 01/05 CES (4) If the servovalve current is correct, do a check of the BSCU output:
(a) On the nose wheels deactivation electrical box 5GC, set the lever to TOWING.
(b) Open the circuit breakers 3GG and 4GG and make sure that the circuit breakers 1GG and 2GG are closed (the BSCU SYS 1 is in command).
(c) On the MCDU on the STEERING DATA page of BSCU SYS 1:
- Push the line key adjacent to the REFRESH indication and make sure that the SELV ORDER parameter shows CLOSED.
- Record the servovalve current SSV CURRENT parameter (ISV5).
(d) Open the circuit breaker 2GG and close the circuit breakers 1GG, 3GG and 4GG (the BSCU SYS 2 is in command).
(e) On the MCDU, get the STEERING DATA page for the BSCU SYS 2:
- On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU2 indication.
- On the BSCU SYS 2 page, push the line key adjacent to the STEERING DATA indication.
(f) On the MCDU on the STEERING DATA page :
- Push the line key adjacent to the REFRESH indication and make sure that the SELV ORDER parameter shows CLOSED.
- Record the servovalve current SSV CURRENT parameter (ISV6).
(g) On the nose wheels deactivation electrical box 5GC, set the lever to normal.
(h) Close the circuit breaker 2GG.
(i) Make sure that the value of (Isv5-Isv6) is less than or equal to plus or minus 1.92 mA.
(j) If the value is not correct:
- Replace the BSCU (10GG) (Ref. AMM TASK 32-42-34-000-001) and (Ref. AMM TASK 32-42-34-400-001).
(k) Do steps (a) thru (i) again and do step (l).
(l) Return the aircraft to service and make a record in the aircraft log book to monitor the NWS durint 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.
_
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-004, 051-054, ∞∞32-51-00∞∞∞∞∞∞∞∞∞∞Page 263
Aug 01/05 CES
(5) If the BSCU output is correct, do a check of the NWS angle 3GC value with the NLG centering cams as reference.
(a) Jack up the front of the aircraft (Ref. AMM TASK 07-11-00-581-003).
NOTE : In the fully extended position of the shock absorber, the
____ NLG is automatically centered (the nose wheel steering is in the zero position).
(b) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(c) On the MCDU on the STEERING DATA page of the BSCU SYS 1(SYS 2):
- Push the line key adjacent to the REFRESH indication,
- Record the NWS ANGLE 3GC value.
(d) Make sure that NWS ANGLE 3GC value is less than or equal to 0 deg. plus or minus 0.5 deg. for the BSCU SYS 1 and BSCU SYS 2.
(e) If the NWS angle is not correct for the BSCU SYS 1 and/or BSCU SYS 2:
- Do a check of the voltage at the nose wheel steering feedback sensor 3GC (Ref. AMM TASK 32-51-19-220-001)
1 If the voltage is out of the specified limits, do the
_ adjustment of the nose wheel steering "zero" position with the NLG centering cams as reference (Ref. AMM TASK 32-51-00-820-002).
(f) If an adjustement of the NWS "zero" position with the centering cams as reference was done, 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.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(117)
