Check Battery Capacity

TASK 33-51-00-710-003-A-01
Check Battery Capacity

WARNING: IF THE RESULT(S) OF THE EPSU-BATTERY CAPACITY TEST IS (ARE) UNSATISFACTORY, REPLACE THE APPLICABLE EPSU BATTERY/BATTERIES. DO NOT DO THE CAPACITY TEST AGAIN AFTER THE FAILURE OCCURRED FOR THE FIRST TIME. IF YOU DO THE TEST AGAIN, A BATTERY EXPLOSION CAN OCCUR. THIS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO THE COMPONENTS.

ZONE: 200

1. Reason for the Job
Refer to the MPD TASK: 335100-03
CHECK BATTERY CAPACITY

NOTE: This task is alternative to 33-51-00-710-003.

2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

B. Referenced Information

REFERENCE	DESIGNATION
TASK 33-51-38-000-002-A	Removal of the Battery of the Emergency Power Supply Unit (EPSU)
TASK 33-51-38-400-002-A	Installation of the Battery of the Emergency Power Supply Unit (EPSU)

3. Job Set-up

CAUTION: DO NOT USE THE TEACH-IN PROCEDURE TO CLEAR EPSU FAILURE MESSAGES. THE TEACH-IN PROCEDURE IS NOT A SYSTEM RESET. IT CAN CHANGE THE EMERGENCY LIGHT CONFIGURATION AND CAUSE HIDDEN FAILURES.

NOTE: The teach-in procedure of the EPSUs measures and keeps the load values that are related to each EPSU. The EPSU controller refers to these load values when the BITE test of the emergency lighting system operates. Thus, it is necessary that the emergency lights of the related EPSUs operate correctly during the teach-in procedure.

NOTE: If the capacity test of the EPSU battery is unsatisfactory, it is recommended that you replace the unserviceable battery. It is not necessary to do the capacity test for the new battery.

Subtask 33-51-00-860-057-A

A. There is no special job set-up for this task.

4. Procedure
Subtask 33-51-00-920-050-A

A. Replacement of the Battery Pack
(1) Remove the batteries from all the Emergency Power Supply Units (EPSU) (Ref. AMM TASK 33-51-38-000-002).
(2) Install the batteries on all the EPSU (Ref. AMM TASK 33-51-38-400-002).

[Rev.10 from 2021] 2026.04.01 00:57:06 UTC