Zone Controller Fault

TASK 21-63-00-810-801-A
Zone Controller Fault

1. Possible Causes

ZONE CONTROLLER [8HK]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 21-63-00-810-827-A	Zone Cont Electrical Component with Short Circuit (Primary/Secondary Channels)
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216301
ASM 216302
AMM 21-63-34-000-001	Removal of the Zone Controller
AMM 21-63-34-400-001	Installation of the Zone Controller

3. Fault Confirmation
Subtask 21-63-00-710-050-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: 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 21-63-00-810-051-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ZONE CONT:

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

(1) If the fault continues:

do a check and repair the wiring if necessary between:
ZC (8HK) connector AC/6 and CB (1HK),
ZC (8HK) connector AC/4 and GND,
ZC (8HK) connector AC/5 and CB (2HK),
ZC (8HK) connector AC/1 and GND,
ZC (8HK) connector AC/11 and GND,
ZC (8HK) connector AB/K8 and GND,
ZC (8HK) connector AB/J13 and CB (3HK) ASM 216301.

(2) If the fault continues:

do a check and repair the wiring if necessary of the signal:
ARINC 429 XTR INT (P) from the ZC (8HK) to the PC 1 (7HH) and the PC 2 (27HH),
ARINC 429 XTR INT (S) from the ZC (8HK) to the PC 1 (7HH) and the PC 2 (27HH),
ARINC 429 RCV INT (S) from the ZC (8HK) to the PC 1 (7HH),
ARINC 429 RCV INT (P) from the ZC (8HK) to the PC 2 (27HH) ASM 216302.

(3) If the fault continues:

do the trouble shooting procedures for the zone cont electrical component with short circuit (Ref. TSM TASK 21-63-00-810-827).

Subtask 21-63-00-810-076-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message NO 28V ON ZONE MAIN:

do a check and repair the wiring between:
ZC (8HK) connector AC/10 and CB (3HK),
ZC (8HK) connector AC/8 and GND ASM 216301.

Subtask 21-63-00-810-077-A ** ON A/C NOT FOR ALL

C. If the test gives the maintenance message NO 28V ON ZONE SECD:

do a check and repair the wiring between:
ZC (8HK) connector AC/9 and CB (4HK),
ZC (8HK) connector AC/7 and GND ASM 216301.

Subtask 21-63-00-710-051-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 21-63-00-860-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:25:00 UTC