DOC AIRBUS | AMM A320FCircuit Breakers Safety Practices
TASK 20-16-00-912-001-A
Circuit Breakers Safety Practices
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
3. Job Set-up
Subtask 20-16-00-860-050-A
Subtask 20-16-00-912-050-A
[Rev.10 from 2021]
2026.03.31 22:59:03 UTC
Circuit Breakers Safety Practices
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ESPM 2010000 | |
| ESPM 2046100 |
Subtask 20-16-00-860-050-A
A. Not Applicable
4. ProcedureSubtask 20-16-00-912-050-A
A. Circuit Breakers Safety Practices
It is necessary to safety an open circuit breaker with safety clips (P/N ABS0772 or equivalent) during:
During aircraft operation, it can be necessary to prevent the operation of an electrical system for:
To prevent the accidental energization of such systems:
1 It is safety practice to install white color safety clips (P/N ABS0772A01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772A02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
(b) Deactivated system
To do the deactivation of such systems:
1 It is safety practice to install red color safety clips (P/N ABS0772B01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772B02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
(2) 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:
1 It is safety practice to install red color safety clips (P/N ABS0772B01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772B02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
3 It is recommended to install a safety tag on the related circuit breakers to inform maintenance staff of maintenance operation in progress ESPM 2010000.
(d) 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 ESPM 2046100.
It is necessary to safety an open circuit breaker with safety clips (P/N ABS0772 or equivalent) during:
- Operation for a not activated optional system or a deactivated system because of MMEL requirements.
- Maintenance when there is work on an electrically controlled or supplied system.
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:
(1) Operation 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.
During aircraft operation, it can be necessary to prevent the operation of an electrical system for:
- a not activated optional system with wiring provision.
- a system that is deactivated because of MMEL requirements.
To prevent the accidental energization of such systems:
1 It is safety practice to install white color safety clips (P/N ABS0772A01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772A02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
(b) Deactivated system
To do the deactivation of such systems:
1 It is safety practice to install red color safety clips (P/N ABS0772B01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772B02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
(2) 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.
1 It is safety practice to install red color safety clips (P/N ABS0772B01A ( 4.6 mm (0.1811 in.) depth), P/N ABS0772B02A ( 7.6 mm (0.2992 in.) depth) or equivalent) on the related circuit breakers.
2 It is recommended to secure the safety clips with stainless steel lockwire (type MS20995C) ESPM 2046100.
3 It is recommended to install a safety tag on the related circuit breakers to inform maintenance staff of maintenance operation in progress ESPM 2010000.
(d) 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 ESPM 2046100.