Removal of the VHF Antennas

TASK 23-12-11-000-001-A
Removal of the VHF Antennas

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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: 154
ZONE: 220
FIN: 4RC1
FIN: 4RC2

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC
FOR [4RC1] (ANTENNA-VHF, 1)
No specific	1	ACCESS PLATFORM 6M (20 FT)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05RDA1)	Adhesive Film Tape-Masking - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
154	U/FLOOR BAY OF AFT CARGO COMPARTMENT
220	FWD CAB UTILITY AREAS

D. 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)
VHF Antennas ** ON A/C NOT FOR ALL
VHF Antennas ** ON A/C NOT FOR ALL
VHF Antennas ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-12-11-860-053-B

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

Subtask 23-12-11-865-050-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4RC1 (ANTENNAVHF, 1)
49VU	COM/VHF/1	2RC1	G09
** ON A/C NOT FOR ALL
FOR FIN: 4RC2 (ANTENNAVHF, 2)
121VU	COM NAV/VHF/2	2RC2	L04
** ON A/C NOT FOR ALL
121VU	COM/VHF/2	2RC2	L04

Subtask 23-12-11-010-050-A

C. Get Access

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(1) Get access to the VHF Antennas:
(a) FOR [4RC1] (ANTENNA-VHF, 1)
put the ACCESS PLATFORM 6M (20 FT) in position at Zone 220.
(b) FOR [4RC2] (ANTENNA-VHF, 2)
find the VHF antenna 4RC2 at Zone 154.

4. Procedure
Subtask 23-12-11-020-050-A

A. Removal of the VHF Antenna 4RC1
(1) Remove the sealant from the heads of the screws (6) with a SCRAPER - NON METALLIC.
(2) Remove the sealant from the base of the antenna (1) and the fuselage structure with a SCRAPER - NON METALLIC.
(3) Remove the screws (6) from the antenna (1).
(4) Lift the antenna (1) until you can see the coaxial cable connector (4).
(5) Disconnect the coaxial cable connector (4) from the antenna connector (2).
(6) Safety the coaxial cable (5). Put Adhesive Film Tape-Masking - - (Material No.05RDA1) around the coaxial cable (5) and attach it to the fuselage.
(7) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(8) Remove and discard the O-ring (3) from the antenna (1).

Subtask 23-12-11-020-054-A

B. Removal of the VHF Antenna 4RC2
(1) Remove the sealant from the heads of the screws (6) and (7) with a SCRAPER - NON METALLIC.
(2) Remove the sealant from the base of the antenna (1) and the fuselage structure with a SCRAPER - NON METALLIC.
(3) Remove the screws (6) and (7) from the antenna (1).
(4) Lift the antenna (1) until you can see the coaxial cable connector (4).
(5) Disconnect the coaxial cable connector (4) from the antenna connector (2).
(6) Safety the coaxial cable (5). Put Adhesive Film Tape-Masking - - (Material No.05RDA1) around the coaxial cable (5) and attach it to the fuselage.
(7) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(8) Remove and discard the O-ring (3) from the antenna (1).

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