(2)
Skydrol Assembly Lube - MCS352
B. Remove Flap Bypass Valve Assembly
(1)
Depressurize hydraulic system A and depressurize hydraulic reservoirs. Refer to 27-51-0, Trailing Edge Flaps - Maintenance Practices.
(2)
Disconnect hydraulic lines connected to bypass valve assembly. (See figure 401.)
(3)
Install plugs in hydraulic lines and cap all ports.
(4)
Open FLAP VALVES circuit breaker and TE ALT FLAP DRIVE MOTOR circuit breaker on circuit breaker panel P6.
(5)
Disconnect electrical connector on bypass valve motor.
(6)
Remove bolts attaching bypass valve assembly to support bracket and remove bypass valve assembly.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-181 Page 401
G23807
Trailing Edge Flap Bypass Valve Installation 500
27-51-181 Figure 401 Feb 15/69
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Install Flap Bypass Valve Assembly
(1)
Install union an O-ring in each port of valve assembly. Lightly lubricate O-ring with hydraulic fluid or assembly lube prior to installation.
(2)
Position valve assembly on support bracket and install mounting bolts. (See figure 401.)
(3)
Remove caps from ports and plugs from hydraulic lines.
(4)
Connect hydraulic lines to valve assembly.
(5)
Install electrical connector on bypass valve motor.
(6)
Test bypass valve. Refer to trailing Edge Flap Bypass Valve-Adjustment/Test.
(7)
Check hydraulic reservoirs and service, if required/
3. Removal/Installation Flap Bypass Valve
NOTE: Use this procedure when replacing assembly of motor and valve. When replacing the motor only use procedure in paragraph 4.
A. Equipment and Material
(1)
Fire Resistant Hydraulic Fluid – BMS 3-11
(2)
Skydrol Assembly Lube – MCS352
B. Remove Flap Bypass Valve
(1)
Depressurize hydraulic system A and depressurize hydraulic reservoir. Refer to 27-51-0.
(2)
Open FLAP VALVES circuit breaker and TE ALT FLAP DRIVE MOTOR circuit breaker on circuit breaker panel P6.
(3)
Disconnect electrical connector from valve motor.
(4)
Remove four valve mounting bolts attaching valve housing. (See figure 401.)
(5)
Carefully remove valve from housing by turning slightly and lifting straight up.
CAUTION: BE PREPARED TO CATCH SPILLED HYDRAULIC FLUID.
(6)
Take necessary precautions to prevent dirt entering shutoff valve cavity when valve is removed.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-181 Page 403
C. Install Flap Bypass Valve
(1)
Install five O-rings with backup rings on replacement valve. (See figure 401.) Lightly lubricate O-rings and backup rings with hydraulic fluid or assembly lube at installation.
(2)
Carefully insert bypass valve into housing.
(3)
Install four mounting bolts. Tighten bolts to 30-40 pound-inches torque range.
(4)
Install lockwire on four mounting bolts.
(5)
Install electrical connector at valve motor.
(6)
Test bypass valve. Refer to Trailing Edge Flap Bypass Valve-Adjustment/Test.
(7)
Check hydraulic reservoirs and service, if required.
500
27-51-181 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/73
4. Removal/Installation Flap Bypass Valve Motor
NOTE: Use this procedure when replacing the valve motor only. When replacing the motor and valve use the procedure in poaragraph 3.
A. Remove Flap Bypass Valve Motor
(1)
Open FLAP VALVES circuit breaker and TE ALT FLAP DRIVE circuit breaker on circuit breaker panel P6.
(2)
Disconnect electrical connector from valve motor.
(3)
Move manual override lever to position 2.
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