R (3) If the steering angle on the MCDU is correct, do a check of the
R servovalve.
R (a) If the Fault Confirmation test was to be done only with the
R taxiway procedure, put the aircraft in the necessary
R configuration to let the nosewheels move freely to the left or
R the right :
R 1_ If the check is to be done with the nosewheels on ground, do
R these steps:
R NOTE : You will need two 1.2 m (3.93 ft.) square steel plates.____
R - Position a steel plate in front of the nosewheels.
R - Apply a thick layer of COMMON GREASE (Material No. 04-004)
R to the upper surface of the steel plate.
R - Put the other steel plate on the top of the greased steel
R plate.
R - Move the aircraft and position the nosewheels on the greased
R steel plates (Ref. AMM TASK 09-10-00-584-002).
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.
R (b) Pressurize the Green hydraulic system
R (Ref. AMM TASK 29-10-00-863-001).
R (c) On the MCDU, get the STEERING DATA page for the BSCU SYS 1:
R - On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent
R to the BSCU1 indication.
R - On the BSCU SYS 1 page, push the line key adjacent to the
R STEERING DATA indication. .
R - Push the line key adjacent to the REFRESH indication and make
R sure that the SELV ORDER parameter shows OPEN.
R NOTE : If the SELV ORDER parameter shows CLOSE get the STEERING____
R DATA page for the BSCU SYS2
R - Push the line key adjacent to the REFRESH indication and
R make sure that the SELV ORDER parameter shows OPEN.
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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 SSV CURRENT 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 SSV CURRENT 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.
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.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(121)
