Installation of the Attenuator-SATCOM

TASK 23-28-45-400-001-A
Installation of the Attenuator-SATCOM

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.

ZONE: 128
FIN: 112RV1 ** 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
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QDB1)	Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128	REAR AVIONIC COMPARTMENT
825, 841

D. Referenced Information

REFERENCE	DESIGNATION
TASK 23-28-00-740-001-A	BITE Test of the Satellite Communication 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)
Attenuator (112RV1)

3. Job Set-up
Subtask 23-28-45-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE and the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE are in position at the access doors 841 and 825.
(2) Make sure that the access doors 841 and 825 are open.
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 23-28-45-865-060-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	SATCOM	102RV1	K01

4. Procedure
Subtask 23-28-45-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Attenuator

Attenuator (112RV1) ** ON A/C NOT FOR ALL

(1) Do an inspection of the component interfaces and the adjacent area.
(2) Make sure that the electrical connectors are clean and in the correct condition.
(3) Connect the attenuator (3) to the disconnected ends of the cable (4).
(4) Install the clamp (2) with the screw (1), the washers (6) and the nut (5).

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.

(5) Safety the cable (4) with 14QDB1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy -.

Subtask 23-28-45-865-061-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
121VU	SATCOM	102RV1	K01

Subtask 23-28-45-740-050-A ** ON A/C NOT FOR ALL

C. Do the BITE test of the satellite communication system (Ref. AMM TASK 23-28-00-740-001).

5. Close-up
Subtask 23-28-45-862-050-A ** ON A/C NOT FOR ALL

A. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 23-28-45-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 841 and 825.
(3) Remove the access platform(s).

[Rev.9 from 2019] 2026.04.02 06:12:04 UTC