Failure of the SDAC Detected by the CSAS

TASK 21-58-00-810-813-A
Failure of the SDAC Detected by the CSAS

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 215301
AMM 21-58-00-710-001	Operational Test of the Conditioned Service Air System without Bleed Air
AMM 21-58-34-000-001	Removal of the CSAS Control Unit
AMM 21-58-34-400-001	Installation of the CSAS Control Unit
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 21-58-00-710-074-A ** ON A/C NOT FOR ALL

A. Do the operational test of the conditioned service air system without bleed air AMM 21-58-00-710-001.

4. Fault Isolation
Subtask 21-58-00-810-062-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC1(1WV1)/CSAS CTL UNIT(100HW):

(1) If the test gives a different maintenance message, do the related trouble shooting procedure.
(2) If the fault continues:

(3) If the fault continues:

(a) If the fault continues:

remove the SDAC 1 and the CSAS CONTROL UNIT
do a check and repair the wiring of the SDAC 1 DATA BUS : between pins AE/9B,9C of the SDAC 1 and pins AB/10HG,10J of the CSAS CONTROL UNIT ASM 215301
install the SDAC 1 and the CSAS CONTROL UNIT

Subtask 21-58-00-710-075-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:50 UTC