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A 747-400 MAINTENANCE MANUAL
 (5)  S 714-018Make sure that the shutoff valve goes to the closed position.
 (6)  S 714-019Make sure that the CREW RESET SWITCH switch-light comes on.
 (7)  S 864-020Push the CREW REST RESET switch-light.
 (8)  S 714-021Make sure that the shutoff valve goes to the open position and that the CREW REST RESET switch-light goes off.
 (9)  S 864-022Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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 21-29-02
 ALL  ú ú 01F Page 404 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
PRESSURIZATION CONTROL
COMPONENT SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
ACTUATOR - PRESSURIZATION OUTFLOW VALVE  2  2  AFT OF BULK CARGO COMPT  21-31-07 
CAPACITOR - TUNING 2  AFT OF BULK CARGO COMPT, P213 
B1688 1  * 
B1689 1  * 
B1690 1  *
 B1691  1  * 
CAPACITOR - TUNING 2  AFT OF BULK CARGO COMPT, P213 
B1684 1  * 
B1685 1  * 
B1686 1  * 
CARD - (REF 21-20-00, FIG. 101) ECS MISC PCA, YMLA13 B1687  1  * 
CIRCUIT BREAKERS - 1  FLT COMPT, P6 
CABIN PRESS AUTO A, C549  1  6J28  * 
CABIN PRESS CONT R ICU, C10268 1  6J31  * 
CABIN PRESS CONT L ICU, C10267  1  6J30  *
 OUTFLOW VALVE MAN-R, C547 1  6L7  *
 OUTFLOW VALVE MAN-L, C548 1  6L6  *
CIRCUIT BREAKERS - (REF 31-01-15, FIG. 101) CABIN PRESS AUTO B, C10183 OUTFLOW VALVE-L, C124 OUTFLOW VALVE-R, C381  1  6J29  *
CIRCUIT BREAKERS - 1  117AL, MAIN EQUIP CTR, P414 
CABIN PRESS ICU LEFT, C3165 1  414M8  *
 R FMC, M7443 L FMC, M7442 COMPUTER - (REF 34-61-00, FIG. 101) CABIN PRESS ICU RIGHT, C3166 1  414B8  *
CONTROLLER - CABIN PRESSURE AUTO A, M7948 1  1  117AL, MAIN EQUIP CTR, E1-3  21-31-02
CONTROLLER - CABIN PRESSURE AUTO B, M7949  1  1  117AL, MAIN EQUIP CTR, E2-3  21-31-02 
DIODE - UPPER PRV BLOCKING, M1810  1  117AL, MAIN EQUIP CTR, E2-4  * 
DIODE - LOWER PRV BLOCKING, M1811  1  117AL, MAIN EQUIP CTR, E2-4  *
FILTER - POSITIVE PRESSURE RELIEF VALVE  3  2  FWD CARGO COMPT, LH  21-32-02
ICU - L CABIN PRESSURE, M7950  2  1  AFT OF BULK CARGO COMPT, LH 21-31-10 
ICU - R CABIN PRESSURE, M7951  2  1  AFT OF BULK CARGO COMPT, RH  21-31-10 
INDICATOR - OUTFLOW VALVE POSITION  1  2  FLT COMPT, P5, CAB PRESS PNL, M181  * 
MODULE - CABIN PRESSURE SELECT, M181  1  1  FLT COMPT, P5  * 
MOTOR - OUTFLOW VALVE AC  2  2  AFT OF BULK CARGO COMPT  21-31-06 
MOTOR - OUTFLOW VALVE DC  2  2  AFT OF BULK CARGO COMPT  21-31-08

 * SEE WDM EQUIPMENT LIST
Pressurization Control - Component Index
Figure 101 (Sheet 1)

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 ALL  ú
 ú  02  Page 101
 ú  Jun 10/90 

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 
RELAYS - (REF 32-09-00, FIG. 101) SYS ALT AIR/GRD, R7334 SYS PRI AIR/GRD, R7331 L RES - CURRENT LIMITING, R423,R424,R425 L OUTFLOW VALVE CLOSE, R356 L OUTFLOW VALVE OPEN, R355 L AUTO/MAN 2, R351 L AUTO/MAN 1, R349 RELAYS - (REF 31-01-33, FIG. 101) R RES - CURRENT LIMITING, R420,R421,R422 R OUTFLOW VALVE CLOSE, R353 R OUTFLOW VALVE OPEN, R352 R AUTO/MAN 2, R350 R AUTO/MAN 1, R348 RELAYS - (REF 31-01-30, FIG. 101) 
SCREEN - PRESSURIZATION OUTFLOW VALVE 2  2  AFT OF BULK CARGO COMPT  21-31-01 
SWITCH - CABIN PRESSURE MODE, (S1)  1  1 FLT COMPT, P5, CAB PRESS PNL, M181  * 
SWITCH - LANDING ALTITUDE, (S5)  1  1  M181 FLT COMPT, P5, CAB PRESS PNL,  *
　
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