Removal of the Head-End Server Unit (HESU)

TASK 46-41-37-000-801-A
Removal 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	AR	CAP - BLANKING
No specific	1	ELECTRICALLY GROUNDED WRIST STRAP
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)

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 46-41-37-000-802-A	Removal of the Cellular-gatelink Subscriber Identity Module (SIM) Card
TASK 46-41-39-000-801-A	Removal of the Head-End Server Unit CF-Card
TASK 46-41-39-000-802-A	Removal of the Head-End Server Unit Media-Drive
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 46-41-00-00	CABIN INFORMATION NETWORK SYSTEM - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 46-41-37-861-050-B ** 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 46-41-37-865-053-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
2000VU	WAP	27MH	D07
2000VU	CINS-HESU	21RF	E02

Subtask 46-41-37-010-050-B ** 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) Put an ACCESS PLATFORM 2M (6 FT) in position at access door 824.
(3) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 46-41-37-020-050-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. Removal of the Head-End Server Unit (HESU)

** ON A/C NOT FOR ALL

(1) Make sure that you are grounded with an ELECTRICALLY GROUNDED WRIST STRAP.
(2) Remove the HESU CF-card (Ref. AMM TASK 46-41-39-000-801).
(3) Remove the HESU media drives (Ref. AMM TASK 46-41-39-000-802).
(4) Remove the cellular-gatelink subscriber-identity module card (Ref. AMM TASK 46-41-37-000-802).
(5) Disconnect the coaxial connector (7) from the HESU TNC connector (8).
(6) Temporarily attach the coaxial connector (7) to the adjacent structure with the TIE WRAP(S).
(7) Loosen and lower the knurled nuts (4).

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.

(8) Remove 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) Use the handles (6) and carefully pull the HESU (1) to disconnect it from the electrical connectors (3).
(b) Carefully remove the HESU (1) from the tray (2).
(9) Put the CAP - BLANKING on each disconnected electrical connector and receptacle.

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