Installation of the GPWC

TASK 34-48-34-400-001-B
Installation of the GPWC

ZONE: 128
FIN: 1WZ ** 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 1M(3 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 34-48-00-610-001-C	Uploading of the Enhanced Ground Proximity Warning Computer (GPWC) Database
TASK 34-48-00-610-003-C	Uploading of the RAAS Configuration DataBase (RCD)
TASK 34-48-00-710-001-G	Operational Check of Ground Self Test System
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
GPWC

3. Job Set-up
Subtask 34-48-34-860-064-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position at the access door 824 in zone 128.
(2) Make sure that the access door 824 is open.

Subtask 34-48-34-865-060-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	EIS/GPWS/115VAC	3WZ	P07
121VU	EIS/GPWS/28VDC	2WZ	P06

4. Procedure
Subtask 34-48-34-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the GPWC
(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 (2) are clean and in the correct condition.
(5) Install the GPWC (1) on its rack (3).
(6) Push the GPWC (1) on its rack (3) to connect the electrical connectors (2).
(7) Engage the nut (4) on the lug (5) and tighten.

Subtask 34-48-34-865-061-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	EIS/GPWS/115VAC	3WZ	P07
121VU	EIS/GPWS/28VDC	2WZ	P06

Subtask 34-48-34-710-053-B ** ON A/C NOT FOR ALL

C. Do the Ground Vocabulary Test of the Enhanced GPWS (Ref. AMM TASK 34-48-00-710-001).
(1) Do a check of the version of the terrain database loaded in the Enhanced GPWC.

NOTE: For the ROPS function (ROPS: Runway Overrun Prevention System), the Enhanced GPWC terrain database must be version 469 minimum.

(2) Do a check of the version of the RAAS Configuration Database (RCD) loaded in the Enhanced GPWC.

Subtask 34-48-34-610-057-B ** ON A/C NOT FOR ALL

D. If the enhanced GPWS does not have the latest version, do the uploading of the enhanced GPWC terrain database (Ref. AMM TASK 34-48-00-610-001).

Subtask 34-48-34-610-058-B ** ON A/C NOT FOR ALL

E. If the RCD does not have the database number RCD70521, do the uploading of the RCD database P/N 69900070-521 (Ref. AMM TASK 34-48-00-610-003).

NOTE: To do the uploading of the RCD database, the enhanced GPWC terrain database must be at least version 469.

5. Close-up
Subtask 34-48-34-860-066-A ** ON A/C NOT FOR ALL

A. Make sure that the work area is clean and clear of tools and other items.

Subtask 34-48-34-410-053-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] 2026.04.02 06:23:30 UTC