ZC receives no Data from the CFDS

TASK 21-63-00-810-829-A
ZC receives no Data from the CFDS

1. Possible Causes

ZONE CONTROLLER [8HK]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216302
AMM 21-63-34-000-001	Removal of the Zone Controller
AMM 21-63-34-400-001	Installation of the Zone Controller
AMM 31-32-00-740-002	BITE Test of the Centralized Fault Display Interface Unit (CFDIU)
ASM 313205

3. Fault Confirmation
Subtask 21-63-00-710-107-A ** ON A/C NOT FOR ALL

A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.

NOTE: Make sure that the circuit breakers 2TW and 8TW are closed during the test.

NOTE: If a fault is detected, the ZC gives a fault code for shop maintenance in addition to the related CFDS message(s). For detailed information see the applicable Page Block 301.

4. Fault Isolation
Subtask 21-63-00-810-112-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message NO DATA FROM CFDS:

do the BITE test of the CFDIU AMM 31-32-00-740-002.

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

replace the ZONE CONTROLLER [8HK] AMM 21-63-34-000-001 and AMM 21-63-34-400-001.

(3) If the fault continues:

do a check and repair the wiring of the signal ARINC 429 OUT (BUS 4) from the CFDIU (1TW) to the ZC (8HK) ASM 216302 and ASM 313205.

Subtask 21-63-00-710-108-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

5. Close-up
Subtask 21-63-00-860-078-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:25:03 UTC