BAT1 and BAT2 disconnected some seconds after the BAT1 and BAT2 Pushbutton Switches are pushed

TASK 24-38-00-810-845-A
BAT1 and BAT2 disconnected some seconds after the BAT1 and BAT2 Pushbutton Switches are pushed

1. Possible Causes

RELAY-BUS 1XP CTL [15XC]
RELAY-BUS 2XP CTL [16XC]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-38-00-710-001	Operational Test of the Battery Charge Limiter (BCL), (with the CFDS)
ASM 243801

3. Fault Confirmation
Subtask 24-38-00-710-126-A

A. Test
Not applicable.

4. Fault Isolation
Subtask 24-38-00-810-095-A

A. If the FAULT legend of the BAT1 and BAT2 pushbutton switches does not come on when:
. the aircraft electrical circuits are energized by the batteries only,
. the voltage of the batteries is more than 25V.

do a check for a ground signal at pin A/Y of the BCL1 (2) ASM 243801.

(1) If there is no ground signal:

replace the RELAY-BUS 1XP CTL [15XC] .

(a) If the fault continues:

replace the RELAY-BUS 2XP CTL [16XC] .

1 If the fault continues:

do a check and repair the wiring between:
. pin A2 of BUS 2XP control relay (16XC) and the ground,
. pin A3 of BUS 2XP control relay (16XC) and pin A2 of BUS 1XP control relay (15XC),
. pin A3 of BUS 1XP control relay (15XC) and pin A/Y of the BCL1 (2).

Subtask 24-38-00-710-127-A

B. Do the operational test of the Battery Charge Limiter (BCL) AMM 24-38-00-710-001.

5. Close-up
Subtask 24-38-00-860-064-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:26:51 UTC