Removal of the VHF Antenna

TASK 23-12-11-000-002-A
Removal of the VHF Antenna

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.

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

ZONE: 250
FIN: 4RC3

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 6M (20 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
250	AFT PASSENGER COMPARTMENT

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 Antenna ** ON A/C NOT FOR ALL
VHF Antenna ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-12-11-860-055-B

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

Subtask 23-12-11-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	COM NAV/VHF/3	2RC3	L05
** ON A/C NOT FOR ALL
121VU	COM/VHF/3	2RC3	L05

Subtask 23-12-11-010-051-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) Put the ACCESS PLATFORM 6M (20 FT) in position at Zone 254.

4. Procedure
Subtask 23-12-11-020-052-A

A. Removal of the VHF Antenna
(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).

[Rev.10 from 2021] 2026.04.02 06:12:00 UTC