Installation of the T/TISS Computer

TASK 34-72-34-400-001-A
Installation of the T/TISS Computer

ZONE: 128
FIN: 1000SG ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 31-32-00-860-010-A	Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page
TASK 34-72-00-610-001-A	Uploading of the TAWS Database
TASK 34-72-00-610-802-A	Uploading of the OBSTACLE Database
TASK 34-72-00-740-001-A	BITE Test of the T/TISS
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
T/TISS Computer

3. Job Set-up
Subtask 34-72-34-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the access door 824 in zone 128.
(2) Make sure that the access door 824 is open.

Subtask 34-72-34-875-051-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	T/TISS	2004SG	K07

4. Procedure
Subtask 34-72-34-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the T/TISS Computer
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors (2).
(4) Make sure that the electrical connectors are clean and in the correct condition.
(5) Install the T/TISS computer (1) on its rack (3) to connect the electrical connectors (2).
(6) Engage the nuts (4) on the lugs (5) and tighten.

Subtask 34-72-34-875-052-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	T/TISS	2004SG	K07

Subtask 34-72-34-740-050-B ** ON A/C NOT FOR ALL

C. Do the Test

NOTE: We recommend you to make sure that the version-of-terrain database and the version-of-obstacle database loaded in the T/TISS are the latest one available.
You can do a check of the Part Number of the TAWS and OBSTACLE databases on the MCDU, on the GPWC LRU IDENTIFICATION page (access from the SYSTEM REPORT/TEST NAV: RADIO NAV page 3/3 (Ref. AMM TASK 31-32-00-860-010)).

(1) If the TAWS database is not the last one updated then do the Uploading of this Database (Ref. AMM TASK 34-72-00-610-001).
(2) If the OBSTACLE database is not the last one updated then do the Uploading of this Database (Ref. AMM TASK 34-72-00-610-802).
(3) Do the BITE test of the T/TISS (Ref. AMM TASK 34-72-00-740-001).

5. Close-up
Subtask 34-72-34-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.

Subtask 34-72-34-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 12:35:49 UTC