EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 08 Page 644 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 866-164
 (21) If you do not use the ACMPs to pressurize the system, make sure these switches on the hydraulic control panel on the P5 panel are in the OFF position:
 (a)  
L HYD PUMPS ELEC

 (b)  
R HYD PUMPS ELEC

 (c)  
C HYD PUMPS ELEC 1

 (d)  
C HYD PUMPS ELEC 2.

 F. Left Hydraulic System PTU Internal Leakage Check
 S 866-165
 (1)
Remove the pressure from the left hydraulic system (Ref 29-11-00).

 S 866-166

 (2)  
Move the PTU manual control switch on the P61 panel to the ON position.

 S 216-167

 (3)  
Make sure the left hydraulic system pressure shown on EICAS is at least 2500 psi.

 NOTE: A pressure of 2500 psi is a general indication of normal PTU
____ operation. If the pressure is not at least 2500 psi, you must trouble shoot the PTU system to find the cause.
 S 216-168
 (4)  Make sure the left system low pressure light on the hydraulic control panel is on.
 NOTE: If the low pressure light is off, you must replace the
____ check valve in the pressure line to the Flap/Slat Depressurization Module because of high leakage. On airplanes with the PTU pressure line routed to the Flap/Slat Depressurization Module, the check valve is located in the module. On airplanes with the PTU pressure port in the Flap/Slat Depressurization Module capped off, the valve is located just aft and outboard of the Flap/Slat Depressurization Module, at approximately Station 1080.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 04 Page 645 ú Jun 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 866-169
 (5)  
Put the PTU manual control switch on the P61 panel to the OFF position.

 G.  
Left Hydraulic System Gross Internal Leakage Check

 S 486-171
 (1)  If you use the flowmeter technique do these steps:
 (a)  If you use an ACMP to pressurize the system, do these steps:
　
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本文鏈接地址：757 AMM 飛機(jī)維護(hù)手冊(cè) 液壓 CHAPTER 29 - HYDRAULIC POWER 1(122)