(2) If the thrust reverser doors operate smoothly, it is mot necessary to do the steps that follow.
(3) If the doors shake during opening or closing, do this HCU bleeding procedure:
(a) Depressurize the hydraulic system (Ref. TASK 29-23-00-864-001).
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(b) Make sure that the hydraulic reservoirs are pressurized at 50 psi
(3.45 bar) (Ref. TASK 29-14-00-614-002).
(c) Put a container below the HCU bleed valve to catch the hydraulic fluid.
(d) Remove the cap from the HCU bleed valve and attach one end of the Skydrol resistant transparent tube to the valve.
(e) Put the other end of the transparent tube in the container.
(f) Slowly open the bleed valve and allow hydraulic fluid to drain.
(g) Continue bleeding as long as the quantity of air bubbles can be seen to be decreasing, and also until a steady flow is achieved. After a reasonable time, when the observable quantity of air bubbles is not changing, close the HCU bleed valve.
NOTE : Use a second wrench to hold the HCU bleed valve when you
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turn the nut to close the valve.
(h) Operate the thrust reverser for 10 deploy-to-stow cycles (Ref. TASK 78-31-00-710-042). Make sure that the thrust reverser doors operate smoothly.
(i) If the doors shake during opening or closing, repeat the HCU bleeding procedure as follows :
NOTE : Do not repeat the HCU bleeding procedure more than tow
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times, refer to thrust reverser trouble shooting
procedure.
- depressurize the hydraulic system (Ref. TASK 29-23-00-864-001)
- repeat steps (f) through (h).
If reverser operates smoothly, proceed from step (j).
(j) Depressurize the hydraulic system (Ref. TASK 29-23-00-864-001).
(k) Remove the transparent tube and install the cap on the bleed valve.
(l) Remove the container from below the HCU bleed valve.
(m) Make sure that the level of the hydraulic fluid in the reservoir is correct. If necessary, fill the reservoir (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002).
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________ Subtask 78-30-00-410-052
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the access platform(s).
(4) Remove the warning notice(s).
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TASK 78-30-00-680-001
Drain the Pipes of the Actuator System
1. Reason for the Job
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The thrust reverser consists of a left and right half door. Each half includes an upper and a lower blocker door actuator and a latch mechanism. The actuators and latch mechanism are hydraulically operated. When you drain the lower actuator and latch mechanism you also drain the upper.
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
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No specific container 1 USgal (4 l)
No specific warning notice
No specific access platform 1 m (3 ft. 3 in.)
No specific Torque Wrench : range 0.20 to 3.60 m.daN
(2.00 to 26.00 lbf.ft)
B. Referenced Information
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320飛機維護手冊 AMM EXHAUST 1(25)
