Removal of the HF Feeder

TASK 23-11-37-000-001-A
Removal of the HF Feeder

ZONE: 260
FIN: 6RE1 ** ON A/C NOT FOR ALL
FIN: 6RE2 ** ON A/C NOT FOR ALL

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	SCRAPER - NON METALLIC

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
260	AFT CABIN UTILITY AREA

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-11-36-000-001-A	Removal of the HF Antenna Coupler
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 25-33-50-000-802-A	Removal of Galley G4B (Space-Flex V2)
TASK 53-45-11-000-001-A	Removal of the Dorsal Fin
HF Coupler Rack
HF Feeder

3. Job Set-up
Subtask 23-11-37-860-050-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).

Subtask 23-11-37-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove the related HF antenna coupler (Ref. AMM TASK 23-11-36-000-001).
(2) If necessary, remove the upper attachment of the aft galley (Ref. AMM D/O 25-33-41-00).
(3) In the cabin:
(a) Remove the related HF coupler rack.

HF Coupler Rack ** ON A/C NOT FOR ALL

1 Hold the HF coupler rack (3) in position and remove the screws (1) and the washers (2).
2 Remove the HF coupler rack (3).
(4) From the external side of the fuselage:
(a) Remove the dorsal fin (Ref. AMM TASK 53-45-11-000-001).

Subtask 23-11-37-010-050-CS ** ON A/C NOT FOR ALL

B. Get Access

HF Coupler Rack ** ON A/C NOT FOR ALL

(1) Remove the related HF antenna coupler (Ref. AMM TASK 23-11-36-000-001).
(2) If necessary, remove the upper attachment of the aft galley (Ref. AMM TASK 25-33-50-000-802).
(3) In the cabin:
(a) Remove the related HF coupler rack:
1 Hold the HF coupler rack (3) in position and remove the screws (1) and the washers (2).
2 Remove the HF coupler rack (3).
(4) From the external side of the fuselage:
(a) Remove the dorsal fin (Ref. AMM TASK 53-45-11-000-001).

Subtask 23-11-37-865-050-A ** ON A/C NOT FOR ALL

C. 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 23-11-37-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the HF Feeder

HF Feeder ** ON A/C NOT FOR ALL

(1) In the cabin:
(a) Remove the countersunk screws (10), which attach the flange (8) to the coupler rack support bracket (9).

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(b) Removal of lockwire:
Remove and discard the lockwire from the nut (7).
(c) Loosen the nut (7).
(2) From the external side of the fuselage:
(a) Remove the cap nut (11) for the related feedline lug (12) from the HF antenna (1).
(b) Remove the feedline lug (12) from the HF antenna (1).
(c) Carefully remove the sealant from the heads of the bolts (3) and from around the flange (5) of the HF feeder (6) with a SCRAPER - NON METALLIC.
(d) Remove the bolts (3) and the washers (4) from the flange (5).
(e) Carefully loosen the flange (5) of the HF feeder (6) from the aircraft structure.
(3) In the cabin:
(a) Fully loosen the nut (7) and remove the flange (8).
(4) From the external side of the fuselage:
(a) Carefully remove the HF feeder (6).

NOTE: The feedline (2) is part of the feeder (6). It is not possible to disconnect the feedline from the feeder.

[Rev.10 from 2021] 2026.04.02 06:11:58 UTC