_________________________________________________
MAINTENANCE PROCESSES - DESCRIPTION AND OPERATION
_______
1.
General The following chapters give the main maintenance processes applied on aircraft.
________________________
2.
Structure of the Chapter
A. Standard Processes (Ref.20-51-00)
B. Inspection/Check and Tests (Ref.20-52-00)
C. Repair Processes (Ref.20-53-00)
D. Protection During Maintenance Checks (Ref.20-54-00)
E. Cleaning (Ref.20-55-00).
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______________________________________________STANDARD PROCESSES - DESCRIPTION AND OPERATION
_______1. General The following chapter gives the standard Processes applied on aircraft.
R ________________________2. Structure of the Chapter
R R A. Safetying Processes (Ref.20-51-10)
R B. Soldering Processes (Ref.20-51-30)
R C. Stacking of Terminals (Ref.20-51-40)
R D. Torque Principle (Ref.20-51-50).
R _______________________________________________SAFETYING PROCESSES - DESCRIPTION AND OPERATION
R R _______1. General This chapter gives the general rules or processes to secure electrical standard items on aircraft.
________________________2. Structure of the Chapter
R A. Locking procedure for circular connectors (Ref. 20-51-12).
R B. Locking procedure for terminal block end clamps (Ref. 20-51-15).
R _____________________________________________________________________LOCKING PROCEDURE FOR CIRCULAR CONNECTORS - DESCRIPTION AND OPERATION
R _______1. General
R This chapter gives two methods to lock electrical circular connectors on the
R connecting part on/and connector to backshell.
R ____NOTE : Each time that a connector safetied by lockwire or an adhesive
R product is disconnected for maintenance, the connector assembly must
be re-locked after its re-installation.
R __________________2. Standard Procedure
R For safetying connectors two types of locking exist:
R - locking with a wire,
R - locking with an adhesive product.
R
R A. Lockwiring Procedure
R
R (1) Material
Locking pliers ref. BELZER VAN EXTRA 2855 or equivalent.
Lockwire stainless steel 0.6 mm (0.0236 in.) dia. (Mat. 19-018).
Lockwire 0.5 mm (0.0196 in.) (Ams 5687) (Mat. 19-009).
Lockwire 0.8 mm (0.0314 in.) (Mat. 19-010).
R (2) Main rules and instructions
R - Lockwire must be used only once.
R - The lockwire diameter must be adapted to the hole diameter.
R - Lockwire must not be bent excessively on cutting edges, lugs, etc.
R - According to the lockwire diameter, the number of authorized turns
R must be complied with to avoid excessive twisting and therefore
R strain on the wire.
R - All parts must be locked so that the wire is under slight tension
R in the counter-rotation direction when the elements are
R disconnected.
R - When the screws and screw heads are locked by lockwire, make sure
R the lockwire is twisted downwards around the screw and cannot slide
R over the head, as this could cause disconnection.
R
R (3) Typical procedure
(Ref. Fig. 001, 002)
R - Screw the connector on the connecting part.
R - Tighten the assembly with pliers UTICA or equivalent.
R - Insert the lockwire through the lockwire hole (Ref. STEP 1).
R - Twist the lockwire with the locking pliers at a sufficient length
R (Ref. STEP 2).
R Locking Procedure for Circular Connectors - Typical Lockwiring Procedure Figure 001
20-51-12 Page 2
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