(3)  
Slide high strength countersunk washer (4) onto bolt (3) with countersink towards bolt head.

(4)  
Insert bolt through actuator forked terminal, drag brace swivel, and nylon washers.

(5)  
Install plain washer (15) on bolt (3) and install nut.

(6)  
Tighten nut 1500 to 1800 pound-inches.

(7)  
Install cotter pin.

502 
32-21-21 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/72 

NOTE:  If cotter pin holes do not line up within specified torque range, try another nut or add a plain washer beneath countersunk washer. Use both methods if necessary.
D.  Check that bearing (19) is properly paired with upper drag brace.
E.  Position upper drag brace and insert each pin (21) through trunnion (24) of upper link (2) into bearing (19) on each wheel well bulkhead.
NOTE:  Keep reference line in alignment with center of drag brace pin antirotation bolthole as closely as possible to reduce difficulty of bolt installation.
F.  Clean drag brace pin antirotation bolts with naphtha and give each bolt a thin coat of corrosion preventive compound.
G.  Install compound coated antirotation bolt (18) in each drag brace pin (21).
H.  Insert key of lubricated keyed washer (23) in keyway on pin and insert two lugs on face of washer into respective slots on end of spherical bearing (19).

I.  Install lubricated flat washer (22) on each pin back of each keyed washer.
J.  Install nut (20) on each drag brace pin and tighten nut finger tight then advance nut to align cotter pin holes.
NOTE:  A gap between spherical bearing (19) and trunnion is allowable, after installation of nut (20) (Detail B, Fig. 401).
K.  Install cotter pin in each drag brace pin.
L.  Clean drag brace pin (6), each spacer bushing (7, 9), and inner surface of bushings in each lock link (8) fork arm with naphtha and lubricate outside of drag brace pin, inside of fork arm bushings, and all surfaces of spacer bushings with grease.
500 
Oct 20/86  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-21-21 Page 403 

Nose Gear Drag Brace Installation  500 
32-21-21  Figure 401 (Sheet 1)  May 15/67 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Nose Gear Drag Brace Installation 
Oct 20/83  Figure 401 (Sheet 2)  32-21-21 
Page 405 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

M.  Install drag brace pin (6).
(1)  
Slide drag brace lower link (10) into fork of drag brace upper link (2).

(2)  
Insert drag brace pin, from left to right, with flat edge of pinhead matching recess in upper link.

(3)  
Install drag brace center washer (12), with raised portion matching recess in upper link.

N.  Insert lubricated spacer bushings (7) and (9) in fork arms of lock link (8).
O.  Clean bolt with naphtha, apply thin coat of corrosion preventive compound and install bolt (11) through drag brace pin to connect lock link assembly.
P.  Install washer, nut, and tighten nut 300 to 400 pound-inches torque.
Q.  Install cotter pin in bolt.
R.  Connect each upper drag brace trunnion arm (17) to door mechanism link (16) with bolt, washer, and nut. Install cotter key.
S.  Connect lower end of drag brace lower link (10) to fitting (26) on shock strut.
(1)  
Lubricate shank and threads of lower link bolt (28).

(2)  
Position lower end of drag brace lower link in fork of fitting (26) on shock strut, with nylon washer (27) over left protruding end of bearing in lower end of lower link.

(3)  
Insert lower link bolt from right to left with indent on tang of bolt head over antirotation pin in right lug of fitting (26).

(4)  
Install flat washer and nut on bolt end.

(5)  
Tighten nut 550 to 700 pound-inches lube torque.

(6)  
Install cotter pin.

T.  Remove nose gear ground lock assembly and perform a nose gear retraction test to check operation of nose gear and drag brace (Ref 32-33-0, A/T).
U.  Install nose gear ground lock assembly (Ref 32-00-01).
V.  Lower airplane nose (Ref Jacking Airplane, Chapter 7).
500 
32-21-21 Page 406  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/84 

NOSE GEAR DRAG BRACE - INSPECTION/CHECK
1.  General
A.  This data consists of illustrations and wear limit charts. No procedure is given in this section for access to permit inspection. Refer to Nose Gear Drag Brace - Removal/Installation for removal procedures.
　
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