Installation of the Multiple VHF Data Radio (MVDR) Transceiver

TASK 23-12-33-400-804-A
Installation of the Multiple VHF Data Radio (MVDR) Transceiver

ZONE: 127
ZONE: 128

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) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
128	REAR AVIONIC COMPARTMENT
824

C. 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 46-21-00-710-002-A	VHF 3 Link Test of the ATSU
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Multiple VHF Data Radio (MVDR) Transceiver

3. Job Set-up
Subtask 23-12-33-860-057-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at access door 824 in zone 128.
(3) Make sure that access door 824 is open.

Subtask 23-12-33-865-061-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
FOR FIN: 10RC1
49VU	COM/VHF/1	2RC1	G09
121VU	COM NAV/VHF/3	2RC3	L05
FOR FIN: 10RC2
121VU	COM NAV/VHF/2	2RC2	L04

4. Procedure
Subtask 23-12-33-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the MVDR Transceiver
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP - BLANKING from the electrical connectors (1).
(4) Make sure that the electrical connectors (1) are clean and in the correct condition.
(5) Install the MVDR transceiver (5) on its rack (2).
(6) Push the MVDR transceiver (5) on its rack (2) to connect the electrical connectors (1).
(7) Engage the nuts (3) on the lugs (4) and tighten.

Subtask 23-12-33-865-062-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
FOR FIN: 10RC1
49VU	COM/VHF/1	2RC1	G09
121VU	COM NAV/VHF/3	2RC3	L05
FOR FIN: 10RC2
121VU	COM NAV/VHF/2	2RC2	L04

Subtask 23-12-33-970-051-A ** ON A/C NOT FOR ALL

C. Do a check of the configuration of the MVDR transceiver that you installed and if necessary, upload the MVDR software (Ref. AMM D/O 23-12-00-61).

Subtask 23-12-33-740-054-A ** ON A/C NOT FOR ALL

D. Do the BITE test of the MVDR system (Ref. AMM D/O 23-12-00-74).

NOTE: As an alternative procedure, you can do this operational test without the CFDS (Ref. AMM D/O 23-12-00-71).

Subtask 23-12-33-710-056-A ** ON A/C NOT FOR ALL

E. Do the VHF 3 link test of the Air Traffic Service Unit (ATSU) to do a check for the correct operation of the datalink communication (Ref. AMM TASK 46-21-00-710-002).

5. Close-up
Subtask 23-12-33-410-053-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 access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 23-12-33-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.8 from Aug 2017] 2026.04.02 06:12:01 UTC