(2)
AMM 24-22-00/201, Manual Control
(3)
SSM 21-31-01, SSM 21-31-04
(4)
WDM 21-31-11, WDM 21-31-21, WDM 21-31-22, WDM 21-31-23
B. Access
(1) Location Zone
222 Control Cabin
C. Procedure
S 864-002
(1)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6L6, CABIN PRESSURE MAN - R
2) 6L7, CABIN PRESSURE MAN - L
(b)
P83 circuit breaker panel in the aft equipment center 1) OUTFLOW VALVE - L 2) OUTFLOW VALVE - R
(2)
Make sure all electrical power is off (AMM 24-22-00/201).
S 024-021
(3)
Loosen the four screws which hold the cabin altitude control module in the P5 panel.
S 024-022
(4)
Disconnect the electrical connector (DM181) from the cabin altitude control module and install caps on the electrical connector.
(5)
Remove the cabin altitude control module.
S 864-015
S 024-023
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A
747-400
MAINTENANCE MANUAL
CABIN ALTITUDE CONTROL MODULE, M181
Cabin Altitude Control Module Installation
Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F31790
A
747-400 MAINTENANCE MANUAL
TASK 21-31-03-404-004
3. Cabin Altitude Control Module Installation (Fig. 401)__________________________________________
A. References
(1)
AIPC 21-31-00 Fig. 05
(2)
AMM 21-31-00/501, Cabin Pressure Control System
(3)
AMM 24-22-00/201, Manual Control
(4)
SSM 21-31-01, SSM 21-31-04
(5)
WDM 21-31-11, WDM 21-31-21, WDM 21-31-22, WDM 21-31-23
B. Access
(1) Location Zone
222 Control Cabin
C. Procedure
S 024-024
(1)
Remove the protective caps on the electrical connectors.
S 424-025
(2)
Connect the electrical connector (DM181) to the cabin altitude control module.
S 414-027
(3)
Install the cabin altitude control module in the P5 panel.
S 424-026
(4)
Tighten the four screws which hold the cabin altitude control module in the P5 panel.
S 864-020
(5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Main Power Distribution Panel
1) 6L6, CABIN PRESSURE MAN - R
2) 6L7, CABIN PRESSURE MAN - L
(b)
P83 circuit breaker panel in the aft equipment center 1) OUTFLOW VALVE - L 2) OUTFLOW VALVE - R
D. Cabin Altitude Module Operational Test
S 864-017
(1) Supply electrical power (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
S 714-018
(2) Do the CPCS Manual Mode Test:
(a)
Make sure the left and right outflow valve operate in manual mode: 1) Push the MAN L or R switch on the cabin altitude control
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