Installation of the High Frequency (HF) Antenna

TASK 23-11-11-400-001-A
Installation of the High Frequency (HF) Antenna

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

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

ZONE: 321
ZONE: 322
FIN: 5RE

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) - ADJUSTABLE
No specific	1	ACCESS PLATFORM 8M (26 FT) - ADJUSTABLE
98L12003001000	1	HARNESS,SAFETY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04QAB2)	Coating_- Flexible Structure
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.12ABE2)	Corrosion Preventive Compound-Water Displacing Oily Film System
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
321	DORSAL FIN
322	VERTICAL STABILIZER LEADING EDGE
321AL, 322AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-720-005-A	Check of the Electrical Bonding of the Different Components (but not the Fluid Systems and Components Installed on Composite materials)
TASK 23-11-00-200-001-A	Check of the Electrical Bonding of the High Frequency (HF) System
TASK 23-11-00-710-001-A	Operational Test of the High Frequency (HF) System
TASK 53-45-11-000-001-A	Removal of the Dorsal Fin
TASK 53-45-11-400-001-A	Installation of the Dorsal Fin
TASK 55-32-11-000-001-A	Removal of the Vertical Stabilizer Leading-Edge
TASK 55-32-11-400-001-A	Installation of the Vertical Stabilizer Leading-Edge
HF Antenna ** ON A/C NOT FOR ALL
High Frequency (HF) Antenna ** ON A/C NOT FOR ALL
High Frequency (HF) Antenna ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-11-11-860-050-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Put on a safety harness:

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.

(a) Put and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area.
(2) Make sure that the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE is in position at zone 322.
(3) Make sure that access panels 321AL and 322AL are removed (Ref. AMM TASK 53-45-11-000-001) and (Ref. AMM TASK 55-32-11-000-001).

Subtask 23-11-11-860-050-GL ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 8M (26 FT) - ADJUSTABLE is in position at Zone 322.
(2) Make sure that the access panels 321AL and 322AL are removed (Ref. AMM TASK 53-45-11-000-001) and (Ref. AMM TASK 55-32-11-000-001).

Subtask 23-11-11-865-057-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 23-11-11-910-051-C ** ON A/C NOT FOR ALL

A. Preparation for Installation

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

(1) Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .

NOTE: The antenna mounting screws give electrical bonding between the antenna and the fuselage structure.

(2) Do a check of the electrical bonding between antenna and the fuselage structure (Ref. AMM TASK 20-28-00-720-005).
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply the Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to all the screws.

Subtask 23-11-11-910-051-GL ** ON A/C NOT FOR ALL

A. Preparation for Installation

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

(1) Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .

NOTE: The antenna mounting screws give electrical bonding between the antenna and the fuselage structure.

(2) Do an inspection of the component interfaces and the adjacent area.
(3) Apply the Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to all the screws.

Subtask 23-11-11-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the HF Antenna
(1) Put the antenna (1) on the antenna supports (6) and install with the screws (4) and the washers (5).
(2) Connect the feedline (2) to the antenna (1) with the cap nut (3).
(3) Apply the Coating_- Flexible Structure (Material No.04QAB2) to all the heads of the screws (4).
(4) Examine the antenna assembly for the condition of the Corrosion Preventive Compound-Water Displacing Oily Film System (Material No.12ABE2) layer. Apply a new layer if necessary.
(5) Do a check of the electrical bonding of the HF system (Ref. AMM TASK 23-11-00-200-001).

Subtask 23-11-11-420-050-B ** ON A/C NOT FOR ALL

B. Installation of the HF Antenna
(1) Put the antenna (1) on the antenna supports (6) and install with the screws (4) and the washers (5).
(2) Connect the feedlines (2) and (7) to the antenna (1) with the cap nuts (3).
(3) Apply the Coating_- Flexible Structure (Material No.04QAB2) to all the heads of the screws (4).
(4) Examine the antenna assembly for the condition of the Corrosion Preventive Compound-Water Displacing Oily Film System (Material No.12ABE2) layer. Apply a new layer if necessary.
(5) Do a check of the electrical bonding of the HF system (Ref. AMM TASK 23-11-00-200-001).

Subtask 23-11-11-420-050-GL ** ON A/C NOT FOR ALL

B. Installation of the HF Antenna
(1) Put the antenna (1) on the antenna supports (6) and install with the screws (4) and the washers (5).
(2) Connect the feedline (2) to the antenna (1) with the cap nut (3).
(3) Apply the Coating_- Flexible Structure (Material No.04QAB2) to all the screw heads.
(4) Examine the antenna assembly for the condition of the moisture-removing oil layer, Corrosion Preventive Compound-Water Displacing Oily Film System (Material No.12ABE2) . Apply a new layer if necessary.

Subtask 23-11-11-865-058-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

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

Subtask 23-11-11-710-050-A ** ON A/C NOT FOR ALL

D. Test
(1) Do the operational test of the HF system (Ref. AMM TASK 23-11-00-710-001).

Subtask 23-11-11-710-050-GL ** ON A/C NOT FOR ALL

D. Do the operational test of the HF system (Ref. AMM TASK 23-11-00-710-001).

5. Close-up
Subtask 23-11-11-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-400-001) (Ref. AMM TASK 55-32-11-400-001).

Subtask 23-11-11-410-051-GL ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-400-001) and (Ref. AMM TASK 55-32-11-400-001).

Subtask 23-11-11-942-050-GL ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 04:04:17 UTC