Cabin Recirculation Fault (SDAC 1 / SDAC 2)

TASK 21-21-00-810-804-A
Cabin Recirculation Fault (SDAC 1 / SDAC 2)

1. Possible Causes

SDAC-1 [1WV1]
SDAC-2 [1WV2]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-21-00-710-001	Operational Test of the Cabin Recirculation Fans
ASM 212101
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 21-21-00-710-057-A

A. Do the operational test of the cabin recirculation fans 14HG and 15HG AMM 21-21-00-710-001.

4. Fault Isolation
Subtask 21-21-00-810-055-A

A. If the ECAM upper DU gives the warning COND L+R CAB FAN FAULT, but no maintenance message comes on:
(1) replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
(2) If the fault continues:

replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.

(3) If the fault continues:

do a check and repair the wiring ASM 212101 between:
the P/BSW-VENTILATION/CAB FANS (4HG)A pin B3 and SDAC-1 (1WV1)AA pin 10G and,
P/BSW-VENTILATION/CAB FANS (4HG)A pin B3 and SDAC-2 (1WV2)AA pin 10G.

Subtask 21-21-00-720-051-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:36 UTC