Installation of the HF Antenna Coupler

TASK 23-11-36-400-001-A
Installation of the HF Antenna Coupler

ZONE: 261
ZONE: 262
FIN: 4RE1
FIN: 4RE2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
261	AFT CABIN UTILITY AREA
262	AFT CABIN UTILITY AREA
261CC
FOR [4RE1] (COUPLER-HF, 1)
261CC
FOR [4RE2] (COUPLER-HF, 2)
262CC

B. Referenced Information

REFERENCE	DESIGNATION
TASK 23-11-00-710-001-A	Operational Test of the High Frequency (HF) System
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 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area
HF Antenna Coupler ** ON A/C NOT FOR ALL
HF Antenna Couplers ** ON A/C NOT FOR ALL
HF Antenna Coupler ** ON A/C NOT FOR ALL
FOR [4RE1] (COUPLER-HF, 1)
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area
FOR [4RE2] (COUPLER-HF, 2)
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area

3. Job Set-up
Subtask 23-11-36-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ceiling panel 261CC is removed (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-11-36-860-050-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the ON/OFF selector switch of the related Radio Management Panel (RMP) is set to OFF.
(3) FOR [4RE1] (COUPLER-HF, 1)
Make sure that the ceiling panel 261CC is removed (Ref. AMM TASK 25-23-42-000-002).
(4) FOR [4RE2] (COUPLER-HF, 2)
Make sure that the ceiling panel 262CC is removed (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-11-36-860-050-GL ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ceiling panel 261CC is removed in the AFT cabin utility area (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-11-36-865-068-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 23-11-36-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the HF Antenna Coupler
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Remove the CAP - BLANKING from the electrical connector (6) and the receptacle (5).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Carefully install the HF antenna coupler (1) into the rack (4).
(7) Lift the fasteners and tighten the knurled nuts (3), until the HF antenna coupler (1) is correctly attached.
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connectors (2) to the related receptacles of the HF antenna coupler (1).

Subtask 23-11-36-420-050-GL ** ON A/C NOT FOR ALL

A. Installation of the HF Antenna Coupler
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors (5) and (6).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Carefully install the HF antenna coupler (1) into the rack (4).
(6) Lift the fasteners and tighten the knurled nuts (3) until the antenna coupler (1) is correctly attached.
(7) Remove the blanking caps from the electrical connectors (2).
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the electrical connectors (2) to the antenna coupler (1).
(10) If the aircraft is operated, when the antenna coupler 4RE2 is removed, make sure that the alternative SHIELD ASSY - EMI P/N A9239825400000 is installed and the electrical connectors (2) are connected to it.

Subtask 23-11-36-865-072-A

B. 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 23-11-36-710-050-A ** ON A/C NOT FOR ALL

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

Subtask 23-11-36-710-050-GL ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 23-11-36-410-051-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 the ceiling panel 261CC in the Aft cabin utility area (Ref. AMM TASK 25-23-42-400-002).

Subtask 23-11-36-410-051-B ** 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) FOR [4RE1] (COUPLER-HF, 1)
(a) Install the ceiling panel 261CC in the aft cabin utility area (Ref. AMM TASK 25-23-42-400-002).
(3) FOR [4RE2] (COUPLER-HF, 2)
(a) Install the ceiling panel 262CC in the aft cabin utility area (Ref. AMM TASK 25-23-42-400-002).

Subtask 23-11-36-410-051-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 ceiling panel 261CC in the aft cabin utility area (Ref. AMM TASK 25-23-42-400-002).

Subtask 23-11-36-862-051-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 23-11-36-862-051-GL ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:49:53 UTC