12-15-06
CENTRAL HYDRAULIC SERVICE CENTER. ú CONFIG 2 ú 01 Page 301 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
CENTRAL HYDRAULIC SERVICE CENTER
SEE B
ASEE LEFT WHEEL WELL ACCUMULATOR
CHARGING LINE
GAGE PRESSURE CHARGING LINE
DUST CAP
CHARGING
HYDRAULIC MOTOR GENERATOR
CHARGING LINE
FWD
LEFT WHEEL WELL A
CHARGING INSTRUCTIONS - HYDRAULIC MOTOR GENERATOR ACCUMULATOR.
WITH SYSTEM DEPRESSURIZED, CHARGE WITH DRY NITROGEN TO APPLICABLE PRESSURE PER
CHART BELOW |100 PSI (690 KPa)
1800 12500
1700 NOMINAL PRECHARGE 1500 PSI (10400 KPa) 11800
VALVE
CENTRAL HYDRAULIC SERVICE CENTER
PRESSURE-PSI GAGE
1600
11100
1500
10400
1400
9700
1300
9000
KILOPASCALS
B
1200 8300
76001100
-50 -25 0 +25 +50 +75 AMBIENT TEMP-CELSIUS
BAC27NHY0274
SERVICING PLACARD
(MOUNTED ON THE CENTRAL HYDRAULIC
SERVICE CENTER ACCESS DOOR)
Hydraulic Motor Generator Accumulator Servicing Figure 301
A60803
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH CHARGING VALVE IN THE ú
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CENTRAL HYDRAULIC SERVICE CENTER. ú CONFIG 2 ú 01 Page 302 ú Sep 28/99
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757
MAINTENANCE MANUAL
S 863-005-002
(3) If the pressure shown is below the specified limits, do these steps: (a) Remove the charging valve cap, and attach the nitrogen source. (b) Loosen the swivel nut one turn. (c) Add nitrogen to the accumulator to the pressure shown on the placard. (d) Tighten the swivel nut. (e) Remove the nitrogen source, and install the valve cap.
S 863-006-002
(4) Pressurize the left hydraulic system if it is necessary (AMM 29-11-00/201).
S 413-007-002
(5) Close the access panel 197KL which covers the central hydraulic service center.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH CHARGING VALVE IN THE ú
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CENTRAL HYDRAULIC SERVICE CENTER. ú CONFIG 2 ú 01 Page 303 ú Sep 28/99
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757 MAINTENANCE MANUAL
OXYGEN - SERVICING
__________________
1. General
_______
A. The servicing procedure for the crew oxygen system gives the instructions to remove unserviceable cylinders and install serviceable cylinders. There is also a minimum dispatch pressure check procedure for the crew oxygen cylinder.
B. GUN 004-007; The servicing procedure for the passenger oxygen system gives the instructions to do an external-fill of the cylinders. Refer to the Prepare for Servicing of the Passenger Oxygen Cylinders - External Fill paragraph. Instructions for removal of unserviceable cylinders are included in the Passenger Oxygen System Servicing (Cylinder Replacement) paragraph.
C. For servicing of the portable oxygen system, instructions are given to remove unserviceable cylinders, and to install serviceable cylinders.
D. Oxygen Requirements
(1) Oxygen for use in airplanes must agree with these specifications:
NOTE: Oxygen that agrees with Specification MIL-O-27210, Type I,
____ agrees with these specifications and is recommended. The quantity of water can be different as given in S.A.E. (AS 1065).
(a)
It must contain not less than 99.5% oxygen by volume.
(b)
It must be free of poisonous contamination to the maximum level possible.
(c)
It must have less than 0.005 milligram of water in each liter at 70°F and a pressure of 760 millimeters of HG.
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