G25188G25216
Trailing Edge Flap Control Valve Installation  522 
27-51-212  Figure 401 (Sheet 1)  Feb 15/71 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

522  Trailing Edge Flap Control Valve Installation 
Feb 15/71  Figure 401 (Sheet 2)  27-51-212 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

C.  Remove Trailing Edge Flap Control Valve 
(1)  
Remove plug buttons from control unit housing (2 places).

(2)  
Remove bolt and spacers attaching valve slide to bellcrank. (See figure 401.)

(3)  
Disconnect hydraulic lines from control valve.

CAUTION: BE PREPARED TO CATCH HYDRAULIC FLUID.

(4)  
Install caps on all ports and plugs in hydraulic lines.

(5)  
Disconnect electrical connector from solenoid valve.

(6)  
Remove four mounting bolts attaching control valve to control unit.

(7)  
Carefully remove control valve from control unit.

D.  Install Trailing Edge Flap Control Valve 
(1)  
Install union and O-ring in each port of valve. Lightly lubricate O-ring with BMS 3-11 hydraulic fluid or Skydrol assembly lube MCS352 prior to installation.

(2)  
Carefully insert control valve into control unit.

(3)  
Install four mounting bolts. (See figure 401.) Tighten bolts and lockwire.

(4)  
Ensure that system A hydraulic power is removed (refer to 27-51-0), from ports and plugs from hydraulic lines.

(5)  
Connect hydraulic lines to control valve.

(6)  
Connect valve slide to bellcrank.

(a)  
Pack lubrication grooves in spacers with grease.

(b)  
Place washer and spacer on bolt.

(c)  
Install bolt with head forward.

(d)  
Secure bolt with spacer, washer, and nut.

(e)  
Tighten nut and install cotter pin.

522 
27-51-212 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/78 

G25285
522  Flap Load Limiter Solenoid Valve Installation 
Feb 15/71  Figure 402  27-51-212 
Page 405 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(7)  
Install plug buttons in control unit (2 places).

(a)  
Snap plug button in place.

(b)  
Apply sealant around edge of plug button.

(8)  
Remove rigging pin F-1.

(9)  
Connect electrical connector to solenoid valve.

(10)
Provide system A hydraulic power (Ref 27-51-0).

(11)
Position flap control lever to FLAP DOWN detent to extend flaps.

(12)
Position flap control lever to FLAP UP detent to retract flaps.

(13)
Check hydraulic connections at control valve for leakage.

(14)
Adjust flap control valve (Ref 27-51-212, Adjustment/Test).

E.  Restore Airplane to Normal Configuration
(1)  
Remove system A hydraulic power (Ref 27-51-0).

(2)  
Check hydraulic reservoirs and service if required (Ref 12-12-0).

(3)  
Install lower pan on flap control unit.

3.  Remove Flap Load Limiter Solenoid Valve
A.  General
(1)  The flap load limiter solenoid valve is externally mounted on the trailing edge flap control valve (Fig. 402).
B.  Equipment and Materials
(1) Hydraulic Fluid - BMS 3-11, or Skydrol Assembly Lube - MCS 352 (Ref 20-30-21)
C.  Prepare Solenoid Valve for Removal
(1)  
Remove system A hydraulic power (Ref 27-51-0).

(2)  
Remove lower pan from flap control unit.

522 
27-51-212 Page 406  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/79 

D.  Remove Solenoid Valve
(1)  
Deleted

(2)  
Install caps on all ports.

(3)  
Remove mounting bolts and lift valve and gasket from control valve.

(4)  
Disconnect electrical wires from solenoid valve.

E.  Install Solenoid Valve
(1)  
Connect electrical wires to solenoid valve.

(2)  
Lubricate O-rings and hydraulic fittings with hydraulic fluid or Skydrol Assembly Lube.

(3)  
Position valve and gasket on control valve and install mounting bolts. Tighten bolts to 25-35 pound-inches.
　
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