(2) To de-activate the IRS, turn the switches on the mode select unit (MSU) to the OFF position.
NOTE: Do not de-activate the IRS by opening the IRS circuit
____ breakers. When the IRS is put in the OFF mode, it performs a power down sequence which includes storing data into non-volatile memory. If the IRS circuit breakers are opened before the completion of the power down sequence, information such as last computed position and corrections to sensor errors will not be stored.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-00
ALL ú ú 01 Page 33 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
INERTIAL REFERENCE SYSTEM
COMPONENT FIG. SHT 102 QTY ACCESS/AREA REFERENCE AMM
CIRCUIT BREAKERS - 1 FLT COMPT, P6
C IRS DISCONNECT, C10386 1 6E32 *
IRS AC CENTER, C8937 1 6D8 *
IRS AC LEFT, C8935 1 6D7 *
IRS AC RIGHT, C8939 1 6D9 *
IRS DC CENTER, C8938 1 6E8 *
IRS DC LEFT, C8936 1 6E7 *
IRS DC RIGHT, C8940 1 6E9 *
CIRCUIT BREAKER - 2 117 AL, MAIN EQUIP CTR, P180
IRS ON BAT, C10335 1 180B4 *
CIRCUIT BREAKER - 2 117AL, MAIN EQUIP CTR, P414
COMPUTER - (FIM 45-10-00/101) MODULE - (FIM 31-61-00/101) MODULE - (FIM 26-21-00/101) COMPUTER - (FIM 34-61-00/101) COMPUTER - (FIM 34-12-00/101) SQUIB TEST/IRS, M7327 EICAS CONTROL PANEL/FMC SWITCH, P2-4 CAPT SOURCE SELECT, M7991 F/O SOURCE SELECT, M7995 C AIR DATA, B166 IRS GND SVCE LOGIC, C10334 R FLIGHT MANAGEMENT, M7443 L FLIGHT MANAGEMENT, M7442 CENTRAL MAINTENANCE, M7373 R AIR DATA, B164 L AIR DATA, B163 1 414N24 *
MODULE - DIODE ASSY, M4163_D 2 1 117AL, MAIN EQUIP CTR, E1-6 *
MODULE - RESISTOR ASSY, M4300_D 2 1 117AL, MAIN EQUIP CTR, E1-6 *
* SEE THE WDM EQUIPMENT LIST
Inertial Reference System - Component Index
Figure 101 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-21-00
ALL ú
ú 09 Page 101
ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
RELAY - (REF 34-12-00. FIG. 101) F/O ADC SOURCE SELECT, R7385 RELAY - (REF 32-09-00, FIG. 101) AIR/GROUND R733 RELAY - (REF 31-01-06, FIG. 101) CENTER IRS DISCONNECT, R7768 IRS DC POWER DISCONNECT, R7475 RELAY - (REF 31-01-36, FIG. 101) IRS GROUND SERVICE, R7680 IRS ON BATTERY, R7681 RELAY - (REF 31-01-39, FIG. 101) LEFT IRS CENTER SEL, R1158 LEFT IRS RIGHT SEL, R1156 RIGHT IRS CENTER SEL, R1159 RIGHT IRS LEFT SEL, R1157 CAPT ADC SOURCE SELECT, R7384
SWITCH - HEADING REFERENCE 1 1 FLT COMPT, P2-4, EICAS SELECT/ 34-21-05
FMC SWITCH PANEL, M7993
SWITCH - L IRS SOURCE SELECT, (S4) 1 1 FLT COMPT, P1-1, CAPT SOURCE 34-21-03
SELECT MODULE, M7991
SWITCH - R IRS SOURCE SELECT, (S4) 1 1 FLT COMPT, P3-1, F/O SOURCE 34-21-03
UNIT - (REF 34-61-00, FIG. 101) C CONTROL DISPLAY, M7441 L CONTROL DISPLAY R CONTROL DISPLAY C EFIS/EICAS INTERFACE, M7352 L EFIS/EICAS INTERFACE, M7353 R EFIS/EICAS INTERFACE, M7351 UNIT - (REF 31-61-00, FIG. 101) SELECT MODULE, M7995
UNIT - C INERTIAL REFERENCE, B7163 2 1 117AL, MAIN EQUIP CTR, E1-6 34-21-01
UNIT - L INERTIAL REFERENCE, B7161 2 1 117AL, MAIN EQUIP CTR, E1-6 34-21-01
UNIT - R INERTIAL REFERENCE, B7162 2 1 117AL, MAIN EQUIP CTR, E1-6 34-21-01
UNIT - MODE SELECT, B7164 1 1 FLT COMPT, P5 34-21-02
* SEE WM EQUIPMENT LIST
Inertial Reference System - Component Index
Figure 101 (Sheet 2)
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