500  Inboard Flap Inboard Track Wear Limits 
Feb 20/87  Figure 602 (Sheet 5)  27-51-161 
Page 607 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FLAP TRACK AFT ENGINE MOUNT ATTACH POINT - INSPECTION/CHECK
1.  Flap Track Aft Engine Mount Attach Point Inspection
A.  General
(1)  This procedure applies to examination of the area of the flap track where the bolt supporting the aft engine mount is inserted.
B.  Prepare for Examination
(1)  
Remove engine midfairing access panels 5119, 5219, 5126, and 5226.

(2)  
Remove firewall pan sealant as necessary. (See figure 601.)

(3)  
Remove cover in firewall pan.

C.  Examine Flap Track at Aft Engine Mount Attach Point
(1)  Examine area around flap track attach point for cracks.
D.  Restore Airplane to Normal
(1)  
Install cover in firewall pan.

(2)  
Install sealant per Chapter 51, Seals and Sealing.

(3)  
Install access panels.

505 
Nov 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-163 Page 601 

G23540
Flap Track Aft Engine Mount Attach Point Inspection  505 
27-51-163  Figure 601  Nov 15/68 
Page 602 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FLAP FLOW LIMITING VALVE - REMOVAL/INSTALLATION
1.  General
A.  The flow limiting valve is installed on the ceiling of the right wheel well.
2.  Equipment and Materials
A.  Fire Resistant Hydraulic Fluid -BMS 3-11 (Ref 20-30-21)
B.  Skydrol Assembly Lube - MCS 352 (Ref 20-30-21)
3.  Remove Flow Limiting Valve (Fig. 401)
A.  Depressurize hydraulic system A (Ref 27-51-0, Maintenance Practices).
B.  Disconnect hydraulic lines and remove flow limiting valve.
C.  Install plugs in hydraulic lines.
4.  Install Flow Limiting Valve (Fig. 401)
A.  Remove reducer from each end of removed valve and install on replacement valve using new 0-rings. Lubricate 0-rings with hydraulic fluid or assembly lube prior to installation.
B.  Remove plugs from hydraulic lines and install flow limiting valve with regulated flow direction arrow on valve pointing toward flap control valve (flow direction arrows on valve in agreement with arrows on marker on ceiling of wheel well adjacent to valve). Tighten hydraulic fittings.
C.  Provide system A hydraulic power (Ref 27-51-0).
D.  Cycle flaps to bleed hydraulic system and check hydraulic fittings for leaks.
E.  Test flow limiting valve (Ref Adjustment/Test).
5.  Restore Airplane to Normal
A.  Remove system A hydraulic power (Ref 27-51-0).
B.  Check hydraulic reservoirs and service if required (Ref Chapter 29).
535 
May 01/75  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-171 Page 401 

G23802
Flow Limiting Valve Installation  535 
27-51-171  Figure 401  Feb 15/80 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FLAP FLOW LIMITING VALVE - ADJUSTMENT/TEST
1. Flap Flow Limiting Valve Test
A. Test Flow Limiting Valve
(1)
Provide system A hydraulic power (Ref 27-51-0, MP).

NOTE:  Hydraulic service cart set at 20 gpm and 3000 psi or operation of at least one engine-driven pump is required to perform this portion of test.

(2)
Move flap control lever from FLAP UP detent to FLAP DOWN (40-unit) detent.

(3)
Check that flaps extend in 35 +5 seconds.

NOTE:  Operating time should be measured from start of flap motion in up position until downstop on number 4 bal1 screw nut is 1.50 +0.20 inches from downstop on jackscrew.

(4)
Position flap control lever in FLAP UP detent.

(5)
Check that flaps retract in 35 +5 seconds.

(6)
Remove system A hydraulic power (Ref 27-51-0, MP).

500 
Oct 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-171 Page 501 

TRAILING EDGE FLAP BYPASS VALVE - REMOVAL/INSTALLATION
1.  General
A.  The following procedures provide instructions for replacement of complete bypass valve including motor, valve and housing. Motor and valve may be replaced without removing housing or motor only may be replaced without removing valve or housing. The motor drive and valve cam are indexed to aid correct motor installation.
　
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