Cold Weather Maintenance - Aircraft Return to Service at very low outside temperatures - Communications

TASK 12-31-23-554-801-A
Cold Weather Maintenance - Aircraft Return to Service at very low outside temperatures - Communications

1. Reason for the Job
This procedure gives the cold weather maintenance practices for the Cabin Intercommunication Data System (CIDS). This procedure describes the handling of the CIDS equipment after recovery of an aircraft at temperatures of -15 deg.C (or above).
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 12-31-21-660-001-A	Cold Weather Maintenance - Air Conditioning
TASK 23-32-36-400-001-A	Installation of the Integrated Prerecorded Announcement and Boarding Music (PRAM) Flashcard
TASK 23-73-00-862-001-A	De-energize the Cabin Intercommunication Data System (CIDS)
TASK 23-73-12-400-002-A	Installation of the Forward Attendant Panel
TASK 23-73-12-400-007-A	Installation of the Flight Attendant Panel
TASK 23-73-13-400-001-A	Installation of the Additional Attendant Panel
TASK 23-73-18-400-001-A	Installation of the Programming and Test Panel
TASK 23-73-19-400-001-A	Installation of the Cabin Assignment Module
TASK 23-73-19-400-002-A	Installation of the Cabin Assignment Module
TASK 23-73-21-400-001-A	Installation of the On-Board Replaceable Module
TASK 23-73-22-400-001-A	Installation of the Attendant Indication Panel
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 12-31-23-840-054-A

A. Recovery of aircraft after cold soaked condition
(1) Do the aircraft recovery for the air conditioning (Ref. AMM TASK 12-31-21-660-001).
(2) Make sure that the temperature in the passenger compartment is at least -15 deg.C (5 deg.F).
(3) Make sure that the Cabin Intercommunication Data System (CIDS) is de- energized
(Ref. AMM TASK 23-73-00-862-001).
(4) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

4. Procedure
Subtask 12-31-23-420-054-A ** ON A/C NOT FOR ALL

A. Installation of removed Equipment
(1) Install the equipment. Do not close the related circuit breakers until you have installed all the equipment.
(a) Install the Forward Attendant Panel (FAP) (Ref. AMM TASK 23-73-12-400-002).
(b) Install the Aft Attendant Panel(s) (AAP) (Ref. AMM TASK 23-73-13-400-001).
(c) Install the Programming and Test Panel (PTP) (Ref. AMM TASK 23-73-18-400-001).
(d) Make sure that the Cabin Assignment Module (CAM) is installed (Ref. AMM TASK 23-73-19-400-001).
(e) Install all Attendant Indication Panels (AIP) in the Passenger compartment (Ref. AMM TASK 23-73-22-400-001).
(2) Close the related circuit breakers and do the tests that follow the installation of the equipment (Ref. AMM TASK 23-73-12-400-002), (Ref. AMM TASK 23-73-13-400-001), (Ref. AMM TASK 23-73-18-400-001), (Ref. AMM TASK 23-73-19-400-001) and (Ref. AMM TASK 23-73-22-400-001).

Subtask 12-31-23-420-054-B ** ON A/C NOT FOR ALL

A. Installation of removed Equipment
(1) Install the equipment. Do not close the related circuit breakers until you have installed all the equipment.
(a) Install the Flight Attendant Panel (FAP) (Ref. AMM TASK 23-73-12-400-007).
(b) Make sure that the Cabin Assignment Module (CAM) is installed (Ref. AMM TASK 23-73-19-400-002).
(c) Make sure that the On-Board Replaceable Module (OBRM) is installed (Ref. AMM TASK 23-73-21-400-001).
(d) Make sure that the Integrated PRAM Flashcard is installed, if applicable (Ref. AMM TASK 23-32-36-400-001).
(e) Install the Additional Attendant Panel(s) (AAP) (Ref. AMM TASK 23-73-13-400-001).
(f) Install all Attendant Indication Panels (AIP) in the Passenger compartment (Ref. AMM TASK 23-73-22-400-001).
(2) Close the related circuit breakers and do the tests that follow the installation of the equipment (Ref. AMM TASK 23-73-12-400-007), (Ref. AMM TASK 23-73-19-400-002), (Ref. AMM TASK 23-73-21-400-001), (Ref. AMM TASK 23-32-36-400-001), (Ref. AMM TASK 23-73-13-400-001) and (Ref. AMM TASK 23-73-22-400-001).

5. Close-up
Subtask 12-31-23-860-053-A

A. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 22:57:34 UTC