Removal of the High Frequency (HF) Antenna

TASK 23-11-11-000-001-A
Removal of the High Frequency (HF) 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: 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
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
98L12003001000	1	HARNESS,SAFETY

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 53-45-11-000-001-A	Removal of the Dorsal Fin
TASK 55-32-11-000-001-A	Removal 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 23-11-11-865-056-A

A. Open, safety and tag 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 23-11-11-941-050-GL ** ON A/C NOT FOR ALL

B. Put the ACCESS PLATFORM 8M (26 FT) - ADJUSTABLE in position at zone 322.

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

C. 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) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position at zone 322.
(3) Remove access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-000-001) (Ref. AMM TASK 55-32-11-000-001).

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

C. Remove the access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-000-001) and (Ref. AMM TASK 55-32-11-000-001).

4. Procedure
Subtask 23-11-11-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the HF Antenna
(1) Remove the cap nut (3) from the feedline (2).
(2) Disconnect the feedline (2) from the antenna (1).
(3) Remove the screws (4) and the washers (5).
(4) Remove the antenna (1) from the antenna supports (6).

Subtask 23-11-11-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the HF Antenna
(1) Remove, the cap nuts (3) from the feedlines (2) and (7).
(2) Disconnect the feedlines (2) and (7) from the antenna (1).
(3) Remove the screws (4) and the washers (5).
(4) Remove the antenna (1) from the antenna supports (6).

Subtask 23-11-11-020-051-GL ** ON A/C NOT FOR ALL

[Rev.10 from 2021] 2026.04.01 04:04:16 UTC