CIDS - Fault in all CIDS-related cabin functions

TASK 23-73-00-810-861-A
CIDS - Fault in all CIDS-related cabin functions

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
AMM 23-73-34-400-001	Installation of the CIDS Director

3. Fault Confirmation
Subtask 23-73-00-710-075-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS BITE test through the CFDS AMM 23-73-00-740-005.
(2) Operate some CIDS related cabin systems.

Subtask 23-73-00-710-075-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS Interface and Power-Up test through the CFDS.
AMM 23-73-00-740-005
(2) Operate some CIDS-related cabin systems.

4. Fault Isolation
Subtask 23-73-00-810-076-A

A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-086-D ** ON A/C NOT FOR ALL

B. If the CIDS BITE test result is no fault message, but you cannot operate the CIDS-related systems:

make sure that at least one cabin door is open.
make sure that the EMER LT (4WL) switch is set to the OFF position.
open these CBs:
49VU: 150RH COM DIR ESS/1,
49VU: 157RH COM DIR ESS/2,
121VU: 151RH CIDS/DIR NORM/1,
121VU: 156RH CIDS/DIR NORM/2.
wait for approx. 10s and close the CBs 156RH and 157RH.
stop for approx. 120s,
do the CIDS BITE test again (start with step 4.) and operate some CIDS-related cabin systems.

(1) If there is no failure message and the related cabin systems are OK:

(2) If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-086-F ** ON A/C NOT FOR ALL

B. If the CIDS Interface and Power-Up test result is no fault message, but you cannot operate the CIDS-related systems:

make sure that at least one cabin door is open.
open these CBs:
49VU: 150RH COM/CIDS/DIR ESS/1,
49VU: 157RH COM/CIDS/DIR ESS/2,
49VU: 15WH AIR COND/CIDS/SDF/DIR1 ESS,
49VU: 18WH AIR COND/CIDS/SDF/DIR2 ESS,
120VU: 151RH COM NAV/CIDS/DIR NORM/1,
120VU: 156RH COM NAV/CIDS/DIR NORM/2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
122VU: 17WH AIR COND/CIDS/SDF/DIR NORM/1.
wait for approx. 10s and close the CBs 156RH, 157RH, 14WH and 18WH.
stop for approx. 120s,
do the CIDS Interface and Power-Up test again (start with step 4.) and operate some CIDS-related cabin systems.

(1) If there is no failure message and the related cabin systems are OK:

(2) If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-086-G ** ON A/C NOT FOR ALL

B. If the CIDS Interface and Power-Up test result is no fault message, but you cannot operate the CIDS-related systems:

make sure that at least one cabin door is open.
make sure that the EMER LT (4WL) switch is set to the OFF position.
open these CBs:
49VU: 150RH COM/CIDS/DIR ESS/1,
49VU: 157RH COM/CIDS/DIR ESS/2,
49VU: 15WH AIR COND/CIDS/SDF/DIR1 ESS,
49VU: 18WH AIR COND/CIDS/SDF/DIR2 ESS,
120VU: 151RH COM NAV/CIDS/DIR NORM/1,
120VU: 156RH COM NAV/CIDS/DIR NORM/2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
122VU: 17WH AIR COND/CIDS/SDF/DIR NORM/1.
wait for approx. 10s and close the CBs 156RH, 157RH, 14WH and 18WH.
stop for approx. 120s,
do the CIDS Interface and Power-Up test again (start with step 4.) and operate some CIDS-related cabin systems.

(1) If there is no failure message and the related cabin systems are OK:

(2) If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-087-A

C. Install the removed DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

Subtask 23-73-00-710-216-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:25:53 UTC