F87781
Standby Hydraulic System Case Drain Filter Installation 500
29-21-31 Figure 401 Aug 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G. Pressurize standby hydraulic system and check filter for leaks.
(1)
Connect electrical power to airplane.
(2)
Close standby pump circuit breakers on P6-11 and P6-12 panels.
WARNING: PERSONNEL STAND CLEAR OF RUDDER AND LEADING EDGE DEVICES.
(3)
On overhead panel, position system A flight control switch to STBY RUD and cycle rudder.
(4)
Place switch in OFF position and remove electrical power.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-21-31 Page 403
STANDBY HYDRAULIC SYSTEM MODULAR UNIT - REMOVAL/INSTALLATION
1. General
A. The standby module is mounted on the center of the aft wheel well bulkhead just above the keel beam (Fig. 401).
B. A container will be necessary to catch hydraulic fluid from hydraulic lines when removing the module unit. Should fluid spill on the airplane, the affected area must be decontaminated. Refer to Chapter 12, Cleaning and Washing.
2. Equipment and Materials
A. Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid - BMS 3-11
3. Remove Standby System Modular Unit
A. Depressurize hydraulic reservoir system. Refer to 29-09-300, Hydraulic Reservoir
Pressurization System - MP.
B. Disconnect standby system motor-driven pump electrical connector.
C. Disconnect leading edge device motor valve, low pressure switch and standby rudder motor valve electrical connectors (Figu. 401).
D. Disconnect all hydraulic lines on modular unit.
E. Install protective plugs in all hydraulic lines and cap open fittings on module.
F. Remove mounting bolts and remove modular unit.
4. Install Standby System Modular Unit
A. Install O-rings and unions in module unit ports. Apply assembly lube or hydraulic fluid to 0-rings and to the threads of unions and reducers to facilitate installation.
CAUTION: ENSURE NO FOREIGN MATTER ENTERS MODULE HOUSING OR CONNECTING HYDRAULIC LINES DURING INSTALLATION.
B. Position module in mounting position and install mounting bolts.
C. Remove plugs from hydraulic lines and connect lines to port fittings (Fig. 401).
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-21-41 Page 401
F87762
Standby System Modular Unit Installation 525
29-21-41 Figure 401 Feb 01/76
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Connect leading edge flap standby drive shutoff valve, low pressure switch and standby rudder actuator shutoff valve electrical connectors.
E. Connect electrical connector to standby system electric motor-driven pump.
F. Pressurize hydraulic reservoir system (Ref 29-09-300 MP).
G. Connect electrical power to airplane.
H. Pressurize standby hydraulic system.
WARNING: ENSURE ALL PERSONNEL AND MAINTENANCE EQUIPMENT ARE CLEAR OF RUDDER AND LEADING EDGE FLAPS AND SLATS BEFORE OPERATION.
NOTE: Standby system is pressurized with the standby pump by switching either of the FLIGHT CONTROL switches to STBY RUD (standby rudder) position or by switching the ALTERNATE FLAP switch to ARM position. Switches are located on the P5 forward overhead panel.
I. Operate leading edge flaps and slats and cycle rudder several times.
J. Examine module unit and line connections for leaks.
K. Return FLIGHT CONTROL and ALTERNATE FLAP switches back to normal position.
L. Remove electrical power from airplane.
M. Service hydraulic reservoirs (Ref Chapter 12, Hydraulic Fluid Servicing).
Aug 01/74 29-21-41 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
STANDBY HYDRAULIC SYSTEM PRESSURE FILTER - UNIT SERVICING
1. General
A. A container will be necessary to catch fluid from modular unit and filter bowl during maintenance of the pressure filter. Should any fluid spil1 on the airplane, decontaminate (Ref Chapter 12, Cleaning and Washing).
2. Equipment and Materials
