4 If the STEER ORDER value is not correct for the BSCU SYS 1
_
and/or SYS 2, do step 6_.
5 If the difference between the NWS ANGLE 3GC SYS 1 (value A)
_ and NWS ANGLE 3GC SYS 2(value B) is not correct, do the step 6_.
6 Replace the BSCU (10GG) (Ref. AMM TASK 32-42-34-000-001) and
_ (Ref. AMM TASK 32-42-34-400-001).
7 Do the steps (a) thru (b) again and make sure that all the
_ parameters are correct for the SYS 1 and the SYS 2, then do the step 8_.
8 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.
- On the overhead panel, on the FLT CTL panel 23VU, make sure that the ELAC1 pushbutton switch is pushed (FAULT and OFF legends off).
- On the overhead panel, on the FLT CTL panel 24VU, make sure that the ELAC2 pushbutton switch is pushed (FAULT and OFF legends off).
- Refer to the Close-Up part (5.A) and do the relevant steps.
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(3) If the steering angle on the MCDU is correct, do a check of the servovalve.
(a) If the Fault Confirmation test was to be done only with the taxiway procedure, put the aircraft in the necessary configuration to let the nosewheels move freely to the left or the right :
1 If the check is to be done with the nosewheels on ground, do
_
these steps:
NOTE : You will need two 1.2 m (3.93 ft.) square steel plates.
____
- Position a steel plate in front of the nosewheels.
- Apply a thick layer of COMMON GREASE (Material No. 04-004) to the upper surface of the steel plate.
- Put the other steel plate on the top of the greased steel plate.
- Move the aircraft and position the nosewheels on the greased steel plates (Ref. AMM TASK 09-10-00-584-002).
NOTE : The procedure that uses the steel plates cannot be
____ accurate if the friction between the steel plates does not let the nosewheels move freely.
2 If the check is to be done with the nosewheels off ground, do
_
these steps:
- Lift the front of the aircraft until the nose wheels are clear of the ground (Ref. AMM TASK 07-11-00-581-003).
- Compress the NLG shock absorber with the nosewheel jack until the dimension H is less than 350 mm (13.7795 in.) (Ref. AMM TASK 07-12-00-582-001)
- Make sure that there is a sufficient clearance between the jack and the nose wheels to operate the nose wheel steering system.
(b) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001).
(c) On the MCDU, get the STEERING DATA page for the BSCU SYS 1:
- On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU1 indication.
- On the BSCU SYS 1 page, push the line key adjacent to the STEERING DATA indication. .
- Push the line key adjacent to the REFRESH indication and make sure that the SELV ORDER parameter shows OPEN.
NOTE : If the SELV ORDER parameter shows CLOSE get the STEERING
____ DATA page for the BSCU SYS2
- Push the line key adjacent to the REFRESH indication and make sure that the SELV ORDER parameter shows OPEN.
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(d) Do a check of the servovalve:
1 Push and hold the Captain left rudder-pedal fully forward and
_ make sure that the nose wheels move 6 deg. to the left.
2 Quickly release the rudder-pedal to the neutral position (+0.5
_
to -0.5 deg.).
3 Make sure that the nose wheels move back to the 0 deg.
_
position.
4 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 (ISV1).
5 Push and hold the Captain right rudder-pedal fully forward and
_ make sure that the nose wheels move 6 deg. to the right.
6 Quickly release the rudder-pedal to the neutral position (+0.5
_
to -0.5 deg.).
7 Make sure that the nose wheels move back to the 0 deg. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(116)
