BITE Test of the Very High Frequency (VHF) System

TASK 23-12-00-740-001-A
BITE Test of the Very High Frequency (VHF) System

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

ZONE: 210

1. Reason for the Job
To make sure that the VHF system operates correctly.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

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)
TASK 31-32-00-860-003-A	Procedure to Get Access to the SYSTEM REPORT/TEST/COM Page

3. Job Set-up
Subtask 23-12-00-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On all RMPs, set the ON/OFF selector switch to ON.
(3) On the Multipurpose Control & Display Unit (MCDU), get access to the "SYSTEM REPORT/TEST/COM" page (Ref. AMM TASK 31-32-00-860-003).

Subtask 23-12-00-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/RMP/1	2RG1	G10
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 NAV/RMP/2	2RG2	L02
** ON A/C NOT FOR ALL
121VU	COM/VHF/3	2RC3	L05
121VU	COM/VHF/2	2RC2	L04
** ON A/C NOT FOR ALL
121VU	COM NAV/RMP/3	2RG3	L03

4. Procedure
Subtask 23-12-00-740-050-C ** ON A/C NOT FOR ALL

A. BITE Test of the VHF System

NOTE: This test is for the system 1. For the other system(s), use the indications between the parentheses.

ACTION	RESULT
1.On the MCDU, on the COM menu page:
Push the line key adjacent to the VHF1 (VHF2, VHF3) indication.	The VHF-1 (2, 3) page comes into view.
2.On the VHF-1 (2, 3) page:
Push the line key adjacent to the TEST indication.	After some seconds the TEST OK indication comes into view.
3.On the MCDU:
On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.

5. Close-up
Subtask 23-12-00-862-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) On all RMPs, set the ON/OFF selector switch to OFF.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 04:04:15 UTC