EPSU - Battery Capacity Fault

TASK 33-51-00-810-803-A
EPSU - Battery Capacity Fault

1. Possible Causes

BATTERY

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-51-00-710-003	Check of the Battery Capacity
AMM 33-51-38-000-002	Removal of the Battery of the Emergency Power-Supply Unit
AMM 33-51-38-400-002	Installation of the Battery of the Emergency Power-Supply Unit

3. Fault Confirmation

CAUTION: DO NOT USE THE TEACH-IN PROCEDURE AS AN ALTERNATIVE FOR TROUBLESHOOTING. A TEACH-IN PROCEDURE IS NOT A RESET PROCEDURE. BEFORE YOU DO A TEACH-IN PROCEDURE, MAKE SURE THAT YOU CORRECTED ALL FAILURES. IF YOU DO NOT OBEY THIS, FAILURES CAN CAUSE A MALFUNCTION OF THE CABIN EMERGENCY LIGHTING SYSTEM.

Subtask 33-51-00-710-054-A ** ON A/C NOT FOR ALL

A. Do the operational test 'Check Battery Capacity by TEST EMER LIGHT BAT Membrane Switch' AMM 33-51-00-710-003.

4. Fault Isolation
Subtask 33-51-00-810-052-A ** ON A/C NOT FOR ALL

A. If after the operational test the green LED 'BAT OK' does not come on:

replace the related BATTERY AMM 33-51-38-000-002 and AMM 33-51-38-400-002.

NOTE: Make sure that you install a fully charged battery.

Subtask 33-51-00-710-055-A ** ON A/C NOT FOR ALL

B. Do the operational test as given in the Para. 3.A.

5. Close-up
Subtask 33-51-00-860-066-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:32:07 UTC