Installation of the High Frequency (HF) Transceiver

TASK 23-11-33-400-001-A
Installation of the High Frequency (HF) Transceiver

ZONE: 127
ZONE: 128
FIN: 3RE1 ** ON A/C NOT FOR ALL
FIN: 3RE2 ** 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	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
128	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-11-00-710-001-A	Operational Test of the High Frequency (HF) System
TASK 23-11-00-740-001-A	BITE Test of the High Frequency (HF) System
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 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
HF Transceiver

3. Job Set-up
Subtask 23-11-33-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 824 in zone 128.
(2) Make sure that the access door 824 is open.

Subtask 23-11-33-865-051-A ** ON A/C NOT FOR ALL

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
FOR FIN: 3RE1 (XCVRHF, 1)
49VU	HF1	1RE1	HA14
FOR FIN: 3RE2 (XCVRHF, 2)
121VU	COM NAV/HF2	1RE2	L13

4. Procedure
Subtask 23-11-33-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the HF Transceiver
(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 (1).
(4) Make sure that the electrical connectors (1) are clean and in the correct condition.
(5) Install the HF transceiver (5) in its rack (2).
(6) Push the HF transceiver (5) on its rack (2) to connect the electricals connectors (1).
(7) Engage the nuts (3) on the lugs (4) and tighten.

Subtask 23-11-33-865-061-A ** ON A/C NOT FOR ALL

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
FOR FIN: 3RE1 (XCVRHF, 1)
49VU	HF1	1RE1	HA14
FOR FIN: 3RE2 (XCVRHF, 2)
121VU	COM NAV/HF2	1RE2	L13

Subtask 23-11-33-740-050-A ** ON A/C NOT FOR ALL

C. Do the BITE test of the HF system (Ref. AMM TASK 23-11-00-740-001)

NOTE: As an alternative procedure, you can do this operational test without the CFDS (Ref. AMM TASK 23-11-00-710-001).

5. Close-up
Subtask 23-11-33-410-050-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) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002)

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