Deactivation of the HF System

TASK 23-11-00-040-801-A
Deactivation of the HF System

1. Reason for the Job
MMEL 23-11-01
HIGH FREQUENCY (HF) COMMUNICATION SYSTEM
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 23-11-00-861-054-A

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

Subtask 23-11-00-865-070-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	HF1	1RE1	HA14
** ON A/C NOT FOR ALL
121VU	COM NAV/HF2	1RE2	L13

4. Procedure
Subtask 23-11-00-040-051-A

A. Deactivation of the HF System
(1) For the deactivation of the HF1 system:
(a) Open, safety and tag this(these) circuit breaker(s):

1RE1.

(2) For the deactivation of the HF2 system:
(a) Open, safety and tag this(these) circuit breaker(s):

1RE2.

5. Close-up
Subtask 23-11-00-860-075-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 06:11:57 UTC