(d) The necessary standard precautions for each LRU are specified in the AMM in the applicable removal/Installation section. For example, "Put the blanking caps on the fixed connector and on the LRU connector(s).

 CIRCUIT BREAKERS - MAINTENANCE PRACTICES
________________________________________
 TASK 20-16-00-912-001
 Circuit Breakers Safety Practices
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________ 
R  A. Referenced Information 
R R R  -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R  20-21-15-912-001  Tightening Torques for Electrical Component Fasteners
 3. Job Set-up__________
 Subtask 20-16-00-860-050
 A. Not Applicable
 4. Procedure_________
 Subtask 20-16-00-912-050
 A. Circuit Breakers Safety Practices It is necessary to safety an open circuit breaker with safety clips (P/N ABS0772 or equivalent) when: - there is work on an electrically controlled or supplied system during maintenance. - such a system is deactived and not serviceable.
 NOTE : The manufacturer recommends safety clips P/N ABS0772 but the____ operator can use equivalents that obey the requirements given in this document. It is important to use safety clips that: - are easy to install and remove - do not cause damage to the circuit breaker or circuit breaker panel. It is always better to use plastic safety clips because they prevent the risk of accidental short circuits (if they fall in an electrical panel for example).

 (1) Maintenance
 (a) There is a risk of injury and damage to equipment and/or the aircraft if persons do work on electrically energized equipment or systems.
 (b) Before maintenance work starts on an electrical equipment or system, it is safety practice to identify, open, safety and tag the circuit breakers related to the equipment or system(s). This prevents the supply of electrical power to the equipment/system(s) and the risk of: - electrical shocks that can occur when there is contact with energized wiring connections, terminals, etc. - short circuits that can occur when metal tools or parts make accidental contact between energized wiring, terminals, contacts, etc.
R R R R R  1_  To make sure that an open circuit breaker remains open, it isnecessary to install a safety clip (P/N ABS0772B01A (4.6 mm (0.1811 in.) depth), P/N ABS0772B02A (7.6 mm (0.2992 in.) depth) (red color) or equivalent) and a safety tag on the circuit breaker (between the circuit breaker button and the circuit breaker panel).
 (2) Operation
 (a) During aircraft operation, it can be necessary to prevent the operation of an electrical system (for example, an optional system with wiring provision that is not activated or a system that is deactivated because of MMEL requirements).
R R R R  1_  To prevent the accidental energization of such systems, it issafety practice to install safety clips (P/N ABS0772A01A (4.6 mm (0.1811 in.) depth), P/N ABS0772A02A (7.6 mm (0.2992 in.) depth) (white color) or equivalent) on the related circuit breakers.
 2_ When these safety clips are installed, it must be possible to see the complete circuit breaker panel and all the placards.
 (3) Tightening torques for circuit breakers
 (a) Make sure that you apply the correct tightening torque when you attach/connect a circuit breaker (Ref. TASK 20-21-15-912-001)

 MAINTENANCE IN STORM CONDITIONS - MAINTENANCE PRACTICES
_______________________________________________________
 TASK 20-17-00-910-001
 Maintenance in Storm Conditions - Safety Practices
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________ 
R  A. Referenced Information 
R R R  -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R  05-51-18-200-001 12-34-24-869-002  Inspection after Lightning Strike Aircraft Grounding for the Maintenance Operations
 3. Job Set-up__________
 Subtask 20-17-00-860-050
 A. Not Applicable
 4. Procedure_________
 Subtask 20-17-00-910-050
 A. Safety Precautions
R R R  (1) During storm conditions, or when there is atmospheric electrical activity, it is recommended: - to stop ground servicing operations external to the aircraft (refueling, etc.), - to remove/disconnect headsets, - to ground the aircraft (Ref. TASK 12-34-24-869-002) - not to touch metal parts, equipment or connections to the aircraft. If a lightening strike occurs, do an inspection after lightening strike. (Ref. TASK 05-51-18-200-001) Lightning strike and high discharge currents can cause severe injury to personnel and/or damage to equipment.
　
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