2......................................…......................................1
 S 424-003
 (2)  Use these steps to install lockwire to bolts and screws (Fig. 401):
 (a)  
On all fittings where you install lockwire, attach the fitting to the mating part or an adjacent part.

 (b)  
Install lockwire for right threads as shown in the figures for this procedure. Install lockwire for left threads opposite to that shown.

 (c)  
Make sure the loop of double wire goes around, not above, the head of the bolt or screw.

 CAUTION: NEVER LOOSEN OR TIGHTEN A NUT OR BOLT OUT OF ITS SPECIFIED
_______ TORQUE RANGE. DAMAGE CAN OCCUR IF THE FASTENER IS NOT CORRECTLY TIGHTENED.
 (d)  When you install lockwires on nuts and bolts, tighten to the low values of the torque range. If it is necessary, continue to tighten until a slot aligns with the safety hole.
 S 424-004
 (3)  To install lockwire on electrical connectors, see Fig. 402.
 (a)  Use the instructions for the installation of lockwires to bolt and screws when you install lockwires on electrical connectors.
 S 424-005
 (4)  To install cotter pins (Fig. 403), do the applicable step:
 (a)  To install cotter pins in castellated nuts, install the pin with the head parallel to the slot in the nut. Bend the cotter pin ends to the bolt end or to the castellated nuts slit adjacent to the pin end.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LOCKWIRE
LOCKWIRE
SELF-LOCKING NUT
SELF-LOCKING NUT
LOCKWIRE
CLAMPS
ATTACH TO STRUCTURE OR LOCKWIRE ADJACENT PART ON UNIT
SELF-LOCKING NUT
CLAMP
PUT CLAMP TO GRIP COUPLING NUT
LOCKWIRE
CLAMP
(2 LOCATIONS)
SELF-LOCKING NUT
AND SCREW OR BOLT

Connector Lockwire Installation Figure 402
PUT CLAMP TO GRIP COUPLING NUT
PUT CLAMP TO GRIP COUPLING NUT
ATTACH TO STRUCTURE OR ADJACENT PART ON UNIT
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Locking Pins - Installation
Figure 403

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b)  
To install cotter pins and washers on clevis pins, put the pin through the hole on the bolt. Bend the pin ends around the side of the bolt.

 (c)  
To install cotter pins in noncastellated nuts, install the pin through the hole on the bolt. Bend the pin ends back on each side of the bolt approximately 90 degrees.

 S 424-006
 (5)  To install lockrings (Fig. 403), do these steps:
 (a)  
Put the bent hook of the lockring into an aligned locking hole in the shaft and nut but do not spring the ring.

 (b)  
Move the lockring above the flange into the groove with minimum expansion of the lockring.

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