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(2) Open the 117AL electronics compartment access door to get to the IRU (AMM 06-09-01/201). EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-01 ALL ú ú 01 Page 401 ú Jun 10/91 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A
747-400 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 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-01 ALL ú ú 01 Page 402 ú Jun 15/98 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 747-400 MAINTENANCE MANUAL 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. EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-01 ALL ú ú 01 Page 403 ú Oct 10/93 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 747-400 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). EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-01 ALL ú ú 01 Page 404 ú Oct 10/93 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 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. www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 导航 NAVIGATION 2
