Installation of the Head-End Server Unit (HESU)

TASK 46-41-37-400-801-A
Installation of the Head-End Server Unit (HESU)

ZONE: 120
FIN: 1000RF ** 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	AR	ACCESS PLATFORM 2M (6 FT)
No specific	1	ELECTRICALLY GROUNDED WRIST STRAP

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
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 46-41-00-710-804-A	System Monitoring Condition Check
TASK 46-41-00-710-812-A	Operational Test of the Cellular Gatelink
TASK 46-41-37-400-802-A	Installation of the Cellular-gatelink Subscriber Identity Module (SIM) Card
TASK 46-41-39-400-801-A	Installation of the Head-End Server Unit CF-Card
TASK 46-41-39-400-802-A	Installation of the Head-End Server Unit Media-Drive
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
TASK 46-41-00-00	CABIN INFORMATION NETWORK SYSTEM - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 46-41-37-860-050-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).

Subtask 46-41-37-865-054-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
2000VU	WAP	27MH	D07
2000VU	CINS-HESU	21RF	E02

Subtask 46-41-37-010-051-A ** ON A/C NOT FOR ALL

C. Get access to the avionics compartment
(1) For the location of this component, refer to Para. Component Location (Ref. AMM D/O 46-41-00-00).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at access door 824.
(3) Make sure that access door 824 is open (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 46-41-37-420-050-C ** ON A/C NOT FOR ALL

CAUTION: OBEY THESE PRECAUTIONS TO PREVENT ELECTROSTATIC DISCHARGE (ESD) DAMAGE TO THE COMPONENTS:

STAY ON A CONDUCTIVE SURFACE THAT IS ELECTRICALLY GROUNDED.
USE A CONDUCTIVE WRIST-STRAP THAT IS ELECTRICALLY GROUNDED. (CONNECTED TO A BONDING-POINT NEAR THE WORK AREA).
BEFORE YOU USE THE TOOLS, MOMENTARILY HOLD THEM AGAINST AN ELECTRICAL GROUND TO RELEASE STATIC ELECTRICITY.

CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE COMPONENT DURING THE PROCEDURE. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO COMPONENT.

A. Installation of the Head-End Server Unit (HESU)

** ON A/C NOT FOR ALL

(1) Do an inspection of the component interfaces and the adjacent area.
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that you are grounded with an ELECTRICALLY GROUNDED WRIST STRAP.
(4) Remove the CAP-BLANKING from each electrical connector and receptacle.
(5) Connect the HESU:

CAUTION: MAKE SURE THAT THE GUIDE SLEEVES STAY ATTACHED TO THE LRU DURING REMOVAL/INSTALLATION. IF THEY BECOME LOOSE, YOU CAN EASILY CAUSE DAMAGE TO THE FIBER OPTIC CONNECTOR AND YOU MUST REPLACE IT (BECAUSE NO REPAIR IS POSSIBLE).

(a) Make sure that all the electrical connections are clean and in the correct condition.

WARNING: BE CAREFUL WHEN YOU MOVE THE RACK-MOUNTED COMPONENTS. SOME RACK-MOUNTED COMPONENTS ARE VERY HEAVY. THERE IS A RISK OF INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

CAUTION: DO NOT USE THE HANDLE(S) TO HOLD THE COMPONENT. USE IT (THEM) ONLY TO REMOVE/INSTALL THE COMPONENT FROM/INTO THE TRAY. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE COMPONENT.

(b) Carefully put the HESU (1) on the tray (2).

CAUTION: MAKE SURE THAT YOU CORRECTLY ALIGN THE LINE REPLACEABLE UNIT (LRU). THIS WILL PREVENT DAMAGE TO THE CONNECTORS.

(c) Use the handles (6) and carefully push the HESU (1) to connect it to the electrical connectors (3).
(d) Engage the knurled nuts (4) on the lugs (5) and tighten them until the HESU (1) is correctly attached.
(6) Cut and discard the TIE WRAP(S)
to release the coaxial connector (7) from the adjacent structure.
(7) Connect the coaxial connector (7) to the HESU TNC connector (8).
(8) Install the HESU CF-card (Ref. AMM TASK 46-41-39-400-801).
(9) Install the HESU media drives (Ref. AMM TASK 46-41-39-400-802).
(10) Install the cellular-gatelink subscriber-identity module card (Ref. AMM TASK 46-41-37-400-802).

Subtask 46-41-37-865-055-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
2000VU	WAP	27MH	D07
2000VU	CINS-HESU	21RF	E02

Subtask 46-41-37-600-050-B ** ON A/C NOT FOR ALL

C. Software Loading

NOTE: Software loading is part of the HESU CF-card installation task (Ref. AMM TASK 46-41-39-400-801).

Subtask 46-41-37-710-050-C ** ON A/C NOT FOR ALL

D. Test
(1) Do the system monitoring condition test (Ref. AMM TASK 46-41-00-710-804).
(2) Do the operational test of the cellular gatelink (Ref. AMM TASK 46-41-00-710-812).

5. Close-up
Subtask 46-41-37-410-050-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close access door 824 (Ref. AMM TASK 52-41-00-410-002).
(4) Remove the access platform(s).

Subtask 46-41-37-862-050-B ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:26:16 UTC