R NOTE : The procedure that uses the steel plates cannot be
____ R accurate if the friction between the steel plates does R not let the nosewheels move freely.
R 2_ If the check is to be done with the nosewheels off ground, do
R these steps:
R - Lift the front of the aircraft until the nose wheels are
R clear of the ground (Ref. AMM TASK 07-11-00-581-003).
R - Compress the NLG shock absorber with the nosewheel jack
R until the dimension H is less than 350 mm (13.7795 in.)
R (Ref. AMM TASK 07-12-00-582-001).
R - Make sure that there is a sufficient clearance between the
R jack and the nose wheels to operate the nose wheel steering
R system.
「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 : 401-499, ∞∞32-51-00∞∞∞∞∞∞∞∞∞∞Page 291
Aug 01/05 CESR (b) Pressurize the Yellow hydraulic system R (Ref. AMM TASK 29-10-00-863-002).
R (c) On the MCDU, get the STEERING DATA page for the BSCU CHAN 1: R - On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent R to the BSCU1 indication R - On the BSCU CHAN 1 page, push the line key adjacent to the R SPECIFIC DATA indication R - On the BSCU CHAN 1/SPECIFIC DATA page, push the line key R adjacent to the STEERING DATA indication. R - Push the line key adjacent to the REFRESH indication and make R sure that the STRSELV parameter shows OPEN.
R NOTE : If the STRSELV parameter show CLOSE get the STEERING DATA
____ R page for the BSCU CHAN 2 R - Push the line key adjacent to the REFRESH indication and R make sure that the STRSELV parameter shows OPEN.
R (d) Do a check of the servovalve:
R 1_ Push and hold the Captain left rudder-pedal fully forward and
R make sure that the nose wheels move 6 deg. to the left.
R 2_ Quickly release the rudder-pedal to the neutral position (+0.5
R to -0.5 deg.).
R 3_ Make sure that the nose wheels move back to the 0 deg.
R position.
R 4_ When movement of the nose wheels stops, on the MCDU on the
R STEERING DATA page:
R - Push the line key adjacent to the REFRESH indication.
R - Record the servovalve current ISTRSV parameter (ISV1).
R 5_ Push and hold the Captain right rudder-pedal fully forward and
R make sure that the nose wheels move 6 deg. to the right.
R 6_ Quickly release the rudder-pedal to the neutral position (+0.5
R to -0.5 deg.).
R 7_ Make sure that the nose wheels move back to the 0 deg.
R position.
R 8_ When movement of the nose wheels stops, on the MCDU on the
R STEERING DATA page:
R - Push the line key adjacent to the REFRESH indication.
R - Record the servovalve current ISTRSV parameter (ISV2).
R 9_ Do these checks:
R - Make sure that 0.5 X (ISV1 + ISV2) is less than or equal to
R plus or minus 0.50 mA.
「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 : 401-499, ∞∞32-51-00∞∞∞∞∞∞∞∞∞∞Page 292
Aug 01/05 CES
R - Make sure that (ISV1 - ISV2) is less than or equal to plus
R or minus 0.50 mA.
R - make sure that ISV1 or ISV2 is less than or equal to plus or
R minus 0.50 mA.
R 10__ If the servovalve currents are not correct:
R - Replace the steering servovalve (Ref. AMM TASK 32-51-51-000-R 002) and (Ref. AMM TASK 32-51-51-400-002).
R 11__ Do steps (1) to (9) again and do step (e).
R (e) Return the aircraft to service and make a record in the aircraft
R log book to monitor the NWS during 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 (4) If the servovalve current is correct, do a check of the BSCU output:
R (a) On the nose wheels deactivation electrical box 5GC, set the lever
R to TOWING.
R (b) Open the circuit breakers 3GG and 4GG and make sure that the
R circuit breakers 1GG and 2GG are closed (the BSCU CHAN 1 is in
R command).
R (c) On the MCDU on the STEERING DATA page for the BSCU CHAN 1:
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 (ISV5).
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(132)
