(2)
Skydrol Assembly Lube - MCS 352
B. Remove Standby Drive Shutoff Valve
(1)
Depressurize hydraulic systems and hydraulic reservoirs. Refer to 27-81-0, Leading Edge Flaps and Slats - Maintenance Practices.
(2)
Open FLAP SHUTOFF VALVES circuit breaker on circuit breaker panel P6.
(3)
Disconnect electrical connector from valve motor.
(4)
Remove four valve mounting bolts attaching shutoff valve body to modular package housing.
500
Feb 01/96 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-81-91 Page 401
G43240
Standby Drive Shutoff Valve Installation 500
27-81-91 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(5)
Carefully remove shutoff valve from modular package 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.
C. Install Standby Drive Shutoff Valve
(1)
Install five 0-rings with backup rings on replacement valve. (See figure 401.) Lightly lubricate 0 -rings and backup rings with Skydrol 500 hydraulic fluid or Skydrol assembly lube MCS 352 at installation.
(2)
Carefully insert shutoff valve into modular package housing.
(3)
Install four mounting bolts. Tighten bolts within 30 to 40 pound-inch torque range.
(4)
Install lockwire on four mounting bolts.
(5)
Install electrical connector at valve motor.
(6)
Test shutoff valve. See Leading Edge Standby Drive Shutoff Valve -Adjustment/Test.
(7)
Check hydraulic reservoir and service, if required.
3. Removal/Installation Standby Drive Shutoff Valve Motor
NOTE: Use this procedure when replacing the valve motor only. When replacing the motor and valve use the procedure in paragraph 2.
A. Remove Standby Drive Shutoff Valve Motor
(1)
Open FLAP VALVES circuit breaker on circuit breaker panel P6-2.
(2)
Disconnect electrical connector from valve motor.
(3)
Move manual override lever to position 2.
(4)
Remove four mounting screws (figure 401) attaching valve motor to valve. Remove valve motor from valve. Remove valve motor from valve.
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Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-81-91 Page 403
B. Install Standby Drive Shutoff Valve Motor
(1)
On replacement of valve motor, move manual override lever to position 2.
(2)
Position valve motor on valve and engage motor drive with valve cam. (See figure 401.)
(3)
Install the four mounting screws.
(4)
Install lockwire on mounting screws.
(5)
Install electrical connector on valve motor.
(6)
Test shutoff valve. See Leading Edge Standby Drive Shutoff Valve - Adjustment/Test.
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LEADING EDGE STANDBY DRIVE SHUTOFF VALVE - ADJUSTMENT/TEST
1. Test Standby Drive Shutoff Valve
A. Connect electrical power to airplane.
B. Close FLAP SHUTOFF VALVES circuit breaker on P6 panel.
C. Close STANDBY RUD and STANDBY HYD PUMP CONT circuit breaker on P6 panel.
D. Open TE ALT FLAP DRIVE MOTOR circuit breaker on P6 panel.
E. Check that manual override lever on valve is at position No. 1.
F. Pressurize hydraulic system A (Ref 27-81-0, MP).
G. Position flap control lever to FLAPS UP detent.
H. Position alternate flap arming switch to ARM.
(1)
Check that STANDBY HYD LOW PRESSURE light comes on.
(2)
Check that standby hydraulic pump starts and that STANDBY HYD LOW PRESSURE light is off.
I. Position flap control lever to 40-unit detent. Check that leading edge flaps and slats do not respond.
NOTE: Flap control lever is moved to 40-unit detent as a standard procedure to minimize load on flap hydraulic motor when hydraulic system A is pressurized.
J. Position alternate flap drive control switch to DOWN.
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