Cold Weather Maintenance - Electrical Power

TASK 12-31-24-660-001-A
Cold Weather Maintenance - Electrical Power

ZONE: 126

1. Reason for the Job
This procedures gives the cold weather maintenance practices for the batteries when the aircraft is in a cold soak configuration.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
126	LATERAL AVIONIC COMPARTMENT

3. Job Set-up
Subtask 12-31-24-941-050-A

A. Not Applicable

4. Procedure
Subtask 12-31-24-660-050-A

A. General.
In very low temperatures, the chemical reaction of the electrolyte is slower and the performance of the batteries decreases :

the quantity of high current that the batteries can supply, decreases,
the time necessary to charge the batteries, increases.
This procedure gives you instructions that keep the batteries serviceable.

NOTE: The values specified in this procedure are only applicable if the aircraft doors stay closed during the cold soak.

Subtask 12-31-24-660-051-A

B. Batteries Maintenance in the Cold Weather
(1) In the cold weather, if the Outside Air Temperature (OAT) is:
(a) Higher than -15 deg.C (5.00 deg.F):

Keep the batteries in the aircraft for the on-wing preservation of the batteries.

(b) Between -15 DEG.C (5 DEG.F) and -30 DEG.C (-22 DEG.F):
1 It is possible during the regular ground checks:

Energize the aircraft with the Ground Power Unit (GPU).

NOTE: There are risks when the state of charge is decreased because of low temperature:

The APU start with the battery can not operate.
The full discharge of the battery can occur.

2 At return to service, replace the batteries with new or serviceable batteries from the workshop.
(c) Less than -30 DEG.C (-22 DEG.F), remove the batteries and send them to the workshop for the off-wing preservation.

[Rev.10 from 2021] 2026.03.31 22:57:35 UTC