(2)  Open the 117AL electronics compartment access door to get to the IRU (AMM 06-09-01/201).
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MAINTENANCE MANUAL

E1 RACK
LEFT IRU
CENTER IRU SEE A RIGHT IRU
SEE A SEE A
MAIN EQUIPMENT CENTER
FAULT INDICATOR
TOTAL TIME
INDICATOR (REFERENCE)
(REFERENCE)
TEST SWITCH
1
(REFERENCE)
INERTIAL REFERENCE UNIT
1 AIRPLANES WITH -110 IRUs AND SUBSEQUENT;
A
NO FAULT BALL INDICATOR IS INSTALLED.
THE CHASSIS INDICATOR HOLE CONTAINS A PLUG.

Inertial Reference Unit Installation Figure 401
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 S 024-034
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE IRU.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE IRU.
 (3) Remove the IRU from the equipment rack (AMM 20-11-22/401).
 TASK 34-21-01-404-004
 3. Install The Inertial Reference Unit
___________________________________
 A. References
 (1)  
AMM 06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
AMM 20-11-22/401, Rack Mounted Electrical/Electronic Modules

 (3)  
AMM 34-21-00/201, Inertial Reference System

 (4)  
AIPC 34-21-01-01

 B. Access
 (1)  
Location Zone
 117 Electrical and Electronics Compartment

 (2)  
Access Panel
 117AL Electronics Compartment Access Door

 C. IRU Installation
 S 864-005
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P6 Main Power Distribution Panel
 1) 6D7 IRS AC LEFT
 2) 6D8 IRS AC CENTER
 3) 6D9 IRS AC RIGHT
 4) 6E7 IRS DC LEFT
 5) 6E8 IRS DC CENTER
 6) 6E9 IRS DC RIGHT
 7) 6E32 C IRS DISCONNECT

 S 864-030
 CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE IRU. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
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MAINTENANCE MANUAL

 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE IRU.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE IRU.
 (2) Install the IRU into the equipment rack (AMM 20-11-22/401).
 D. Test The IRU(s)
 S 714-033
 (1) Align the IRU(s) (AMM 34-21-00/201).
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747-400 MAINTENANCE MANUAL
 IRS MODE SELECT UNIT - REMOVAL/INSTALLATION
___________________________________________
 1.  General (Fig._______401)
 A.  This procedure contains two tasks. The first task is for the removal of the IRS Mode Select Unit (MSU). The second task is for the installation of the IRS MSU.
 B.  The IRS MSU is installed in the P5 Overhead Panel.
　
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