NOTE:  The full stroke dimension should fall within the range given in Figure 801,  (Sheet 3). If not, do the step that follows.
(a)  Disassemble the shock strut and look for missing parts or parts that are not installed correctly.
(37) Install lockplate (1).
D.  Restore Airplane to Normal
(1)  
Connect hydraulic lines and electrical cable.

(2)  
Wipe exposed inner cylinder with hydraulic fluid.

(3)  
Service shock strut (Ref Chapter 12, Main Landing Gear Shock Strut Servicing).

(4)  
Remove tag identifying shock strut, SPARE SEALS USED.

(5)  
Pressurize hydraulic system and apply brakes (Ref 29-11-0, MP and to 29-12-0, MP).

(6)  
Check hydraulic brake connections for leaks.

(7) 
 Bleed brakes.

(8)  
Lower airplane and check for leaks at gland nut (Ref Chapter 7, Jacking Airplane).

(9)  
Remove airplane jacks.

(10)
Close all landing gear circuit breakers on P6 panel.

May 01/99  32-11-21
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Page 811/812

MAIN GEAR UPPER DRAG STRUT - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Ground Lock Assemblies (Ref 32-00-01).
B.  Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
2.  Prepare to Remove Upper Drag Strut
A.  Check that all ground lock assemblies (Ref 32-00-01) are installed.
B.  Jack airplane until wheels just clear ground (Ref Chapter 7, Airplane Jacking).
3.  Remove Upper Drag Strut
A.  Release clamps (6, Fig. 401) securing center wing door (5) to upper drag strut (3).
B.  Release clamps (9) securing hydraulic lines and electrical harness to upper drag strut (3).
C.  Remove lower attachment bolt (13) and allow drag strut to hang from upper attachment (4).
D.  Support drag strut, remove attachment bolt (2), and remove upper drag strut from airplane.
(1)  Mark and retain drag strut upper attachment bolt (2) for installation in same location. On some airplanes, bolt is identified by a yellow head.
4.  Install Upper Drag Strut
A.  Check mating surfaces for allowable wear (Ref Inspection/Check).
B.  Clean and lightly lubricate all bolts, washers, and bushings with grease, immediately before assembly.
C.  Place upper drag strut (3, Fig. 401) in position over upper attachment (4) with locking flat inboard.
D.  Insert upper attachment bolt (2) with head inboard. Add washer and nut.
CAUTION:  ENSURE THAT DRAG STRUT UPPER ATTACHMENT BOLT (2) IS SAME BOLT OR REPLACEMENT BOLT IS SAME PART NUMBER AS THAT WHICH WAS REMOVED IN STEP 3.D. DRAG STRUT UPPER ATTACHMENT BOLT (2) IS A STRUCTURAL FUSE AND MUST BE INSTALLED IN SAME LOCATION FROM WHICH REMOVED TO MAINTAIN STRUCTURAL INTEGRITY OF THE REAR SPAR.
510 
Sep 01/02  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-11-31 Page 401 

Main Gear Upper Drag Strut Installation  500 
32-11-31  Figure 401 (Sheet 1)  Nov 15/69 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Main Gear Upper Drag Strut Installation 
Feb 20/85  Figure 401 (Sheet 2)  32-11-31 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

E.  Tighten nut as tightly as possible by hand. If necessary, back off nut to align nearest castellation with cotter pin hole in bolt. Lock nut with cotter pin.
F.  Swing upper drag strut (3) into position in lower drag strut fork (10).
G.  Align holes and insert bolt with head end left. Add washer and nut.
H.  Tighten nut to 100-150 pound-inches lube torque. If necessary, back off nut to align nearest slot and install cotter pin.
I.  Connect clamps (6) securing center wing door (5) to drag strut (3).
J.  Connect clamps (9) securing hydraulic lines and electrical harness to drag strut (3).
K.  Perform a retraction test of main landing gear only per 32-32-0 A/T.
L.  Check hydraulic line connections for leaks.
M.  Lower airplane and remove jacks (Ref Jacking Airplane, Chapter 7).
500 
32-11-31 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/95 

MAIN GEAR UPPER DRAG STRUT - INSPECTION/CHECK
1.  General
A.  These data consist of illustrations and wear limit charts. No procedure is given in this section for access to permit inspection. Refer to Main Gear Upper Drag Strut - Removal/Installation.
　
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