Deactivation of the VHF System

TASK 23-12-00-040-801-A
Deactivation of the VHF System

1. Reason for the Job
MMEL 23-12-01
VHF COMMUNICATION SYSTEMS (FAA ONLY)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
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 23-12-00-861-055-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 23-12-00-865-060-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM/VHF/1	2RC1	G09
** ON A/C NOT FOR ALL
121VU	COM NAV/VHF/3	2RC3	L05
121VU	COM NAV/VHF/2	2RC2	L04
** ON A/C NOT FOR ALL
121VU	COM/VHF/3	2RC3	L05
121VU	COM/VHF/2	2RC2	L04

4. Procedure
Subtask 23-12-00-040-050-A

A. Deactivation of the VHF System
(1) For the deactivation of the VHF1 system:
(a) Open, safety and tag this(these) circuit breaker(s):

2RC1.

(2) For the deactivation of the VHF2 system:
(a) Open, safety and tag this(these) circuit breaker(s):

2RC2.

(3) For the deactivation of the VHF3 system:
(a) Open, safety and tag this(these) circuit breaker(s):

2RC3.

5. Close-up
Subtask 23-12-00-860-068-A

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

[Rev.10 from 2021] 2026.04.02 06:11:59 UTC