20-10-23
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MAINTENANCE MANUAL
DOUBLE TWIST PROCEDURE
DOUBLE-TWIST (PROCEDURE)
SINGLE-WIRE PROCEDURE OR NUT (CLOSELY SPACED)
Lockwire Installation Figure 401
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20-10-23
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MAINTENANCE MANUAL
TASK 20-10-23-424-010
3. Install Lockwire
________________
NOTE: The figures in this section show the lockwire installed on right
____ threads. Install lockwire on left threads opposite to that shown.
A. General
(1) Use these types of wires for lockwire:
(a)
In elevated temperature areas, use monel, inconel, or corrosion resistant lockwire.
(b)
Use copper wire, 0.020 in. diameter, only on emergency devices. Use it where a seal is necessary on emergency equipment to indicate these devices have not been used. Emergency equipment includes portable fire extinguishers, first aid kits, emergency valve and oxygen regulators.
(c)
Use clad 5056 aluminum alloy wire for lockwire that touches magnesium. This wire prevents galvanic corrosion.
NOTE: This table shows BAC standard wire sizes:
____
~............................................................................. | MATERIAL | SIZE (IN) | ...............................................................................
| Monel or Inconel | .020 .032 .040 .051 .091 |
| Corrosion Resistant Steel | .020 .032 .040 .051 .091 |
| Aluminum Alloy | .020 .032 .040 .051 .091 |
2......................................…......................................1
B. Procedure S 424-003
(1) To install lockwires on bolts and screws, see Fig. 401. NOTE: For fittings on which lockwire is necessary, install the
____ lockwire on the mating part or an adjacent part.
(a) Make sure the loop of the double wire goes around, not over, 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.
(b) Tighten the nut or bolt to the low specified torque value. If necessary, continue to tighten until a slot aligns with the safety hole.
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MAINTENANCE MANUAL
LOCKWIRE
LOCKWIRE LOCKWIRE
CLAMPS SELF PUT CLAMP TO GRIPLOCKING NUT COUPLING NUT
SELF LOCKING NUT
LOCKWIRE
LOCKWIRE ATTACH TO STRUCTURE ATTACH TO OR ADJACENT STRUCTURE
SELF LOCKING NUT PART ON UNIT OR ADJACENT
PART ON UNIT
CLAMP
PUT CLAMP TO GRIP COUPLING NUT
PUT CLAMP TO GRIP
ATTACH TO
COUPLING NUT
STRUCTURE OR
ADJACENT PART LOCKWIRE
ON UNIT
CLAMP (2 LOCATIONS)
SELF LOCKING NUT AND SCREW OR BOLT
Connector Lockwire - Installation
Figure 402
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