Installation of the Data Memory Module (131-9(A))

TASK 49-73-32-400-001-A
Installation of the Data Memory Module (131-9(A))

CAUTION: DO NOT REPLACE THE ECB AND THE DATA MEMORY MODULE AT THE SAME TIME.

ZONE: 315
ZONE: 316

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315	TAIL CONE APU AND ACCESSORY COMPARTMENT
316	TAIL CONE APU AND ACCESSORY COMPARTMENT
315AL, 316AR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 31-32-00-860-001-A	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
TASK 49-73-32-600-001-A	ECS Performance Adjustment (131-9(A))
TASK 49-73-32-600-002-A	Restart of the Data Memory Module (131-9(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-00-410-001-A	Close the APU Doors after Access
Data Memory Module

3. Job Set-up
Subtask 49-73-32-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On panel 25VU make sure that the APU MASTER SW pushbutton switch is OFF.
(3) Make sure that there is a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(5) Make sure that the access platform is in position below the APU compartment.
(6) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(7) Make sure that LIGHT control SW 11LJ is set to the ON position.

Subtask 49-73-32-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

4. Procedure
Subtask 49-73-32-420-050-A ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT THE DATA ARE ERASED FROM THE MEMORY OF THE REPLACEMENT DATA MEMORY MODULE. IF THE DATA STAY IN THE REPLACEMENT MODULE, THEY WILL ERASE THE LIFE DATA IN THE ECB FOR THE APU ON THE AIRCRAFT. THE ECB WILL THEN CALCULATE THE LIFE DATA OF A DIFFERENT APU.

A. Installation of the Data Memory Module

NOTE: The removal of the module to use it on a different APU is not permitted. Replace with a new module or remove and install the same module.

(1) Replace or install again the data memory module:
(a) If you replace the data memory module:

Start the data memory module (Ref. AMM TASK 49-73-32-600-002) to make sure that the data memory module is erased.

(b) If you install the removed data memory module again:

Start the data memory module (Ref. AMM TASK 49-73-32-600-002) to make sure that the APU serial number is correct.

(2) Put the data memory module (4) in position on the APU.
(3) Install the washers (3) and the bolts (2).
(4) Remove the blanking cap from the electrical connector (1).
(5) Connect the electrical connector (1) to the data memory module (4).

Subtask 49-73-32-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-73-32-710-050-A ** ON A/C NOT FOR ALL

C. Do the APU SYSTEM SELF-TEST to make sure that the Data Memory Module is serviceable
(1) Set the CFDS to get the SYSTEM REPORT/TEST page for the APU (Ref. AMM TASK 31-32-00-860-001).
(2) On overhead control and indicating panel 25VU, push the APU MASTER SW pushbutton switch (the ON legend comes on).
(3) Do this test:

ACTION	RESULT
1.On the MCDU: Push the pushbutton adjacent to the SYSTEM SELF-TEST indication.	On the MCDU: The APU SYSTEM SELF-TEST page shows and the message IN PROGRESS comes on.
	If the test is satisfactory, the message TEST OK comes on. This indicates that all LRU's are serviceable.
	If the test is not satisfactory, the name and the ATA reference number of the unserviceable LRU shows.
Push the pushbutton adjacent to the RETURN display.	The APU menu page comes on.
Push the pushbutton adjacent to the RETURN display.	The SYSTEM REPORT/TEST page comes on.
Push the pushbutton adjacent to the RETURN display.	The CFDS page comes on.

(4) On overhead control and indicating panel 25VU, release the APU MASTER SW pushbutton switch (the ON legend goes off).

Subtask 49-73-32-860-057-A ** ON A/C NOT FOR ALL

D. ECS Performance Adjustment
(1) If necessary, you can change the performance adjustment to de-rate mode or original mode (Ref. AMM TASK 49-73-32-600-001).

5. Close-up
Subtask 49-73-32-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(3) Remove the access platform(s).

Subtask 49-73-32-860-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:43:22 UTC