757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(37)

曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者

 C.  The sequence in which you pressurize or remove pressure from the hydraulic systems can cause fluid to move between the left and right systems. This can cause a high fluid level in one system and a low fluid level in the other system. To keep the movement of the fluid between the systems to a minimum, pressurize the right system before you pressurize the center and left systems. Also, remove the pressure from the center and left systems before you remove the pressure from the right system.
 (1)  The fluid can move to the left system if you set the parking brake in one of the following conditions and then release the brake with only the left system pressurized:
 -the right and left hydraulic systems pressurized - only the right hydraulic system pressurized
 -no hydraulic system pressurized
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MAINTENANCE MANUAL

 (2)  
The fluid can move to the right system if you set the parking brake with only the left system pressurized and then release the brake in one of these conditions:

 -the right and left hydraulic systems pressurized - only the right hydraulic system pressurized
 -no hydraulic system pressurized

 D.  
It can be necessary to flush the hydraulic system and replace or examine the filter elements if there is a hydraulic system failure. The table below contains the failure conditions and the procedures that are necessary to correct the failure.

 CAUTION: IF PUMP IS OPERATED FOR ANY LENGTH OF TIME WITH THE SHUTOFF VALVE
_______ CLOSED, PUMP REPLACEMENT IS REQUIRED.
 ~............................................................................... | CONDITION | CONDITION | PROCEDURE TO CORRECT THE CONDITION | | NO. | | | ................................................................................. | 1. | A pump failure that does| 1. It is not necessary to flush the | | | not cause a hydraulic | sytem. | | | fluid contamination | 2. Do a check of the pressure and | | | | case drain module differential | | | | pressure indicators. If any are | | | | extended, replace the filter | | | | elements (AMM 29-11-17/401, | | | | 29-11-18/401, and 29-11-19/401) | | | | 3. It is not necessary to replace the | | | | return filter element. | .................................................................................
 |  2.  | A pump failure that  | 1.  Flush the applicable  |
 |  | causes hydraulic fluid  |  pressure/case drain line.  |
　
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