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A
757 MAINTENANCE MANUAL
S 025-061
(11)
Remove the sys-2-air/gnd relay K207 from the P37 panel.
(a)
Make sure the EICAS status message AIR/GND DISAGREE does show on the lower display.
S 425-062
(12)
Install the sys-2-air/gnd relay K207 in the P37 panel.
S 865-070
(13)
Do the Maintenance Message Erase procedure (AMM 31-41-00/201).
(a)
Make sure the EICAS status message AIR/GND DISAGREE does not show on the lower display.
E.
Put the Airplane Back to Its Usual Condition
S 415-064
(1)
Close the No. 1 cargo door, 821 (AMM 06-46-00/201).
S 865-078
(2)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
CABIN PRESSURE SELECTOR - REMOVAL/INSTALLATION
______________________________________________
1. General_______
A. This procedure contains two tasks. The first task is the removal of the cabin pressure selector. The second task is the installation of the cabin pressure selector.
B. The cabin pressure selector contains controls and circuitry necessary for automatic or manual cabin pressure selection. The selector is in the pilot's overhead panel, P5.
TASK 21-31-01-004-001
2. Remove the Cabin Pressure Selector (Fig. 401)__________________________________
A. Access
(1)
Location Zones
211/212 Control Cabin - Section 41
B.
Procedure
S 864-002
(1)
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11B14, CABIN ALTITUDE CONTROL MANUAL
(b)
11B15, CABIN ALTITUDE CONTROL SELECT
(c)
11N15, CABIN ALTITUDE CONTROL AUTO 1
(d)
11N24, CABIN ALTITUDE CONTROL AUTO 2
S 034-003
(2)
Loosen the 1/4-turn fasteners on the selector panel.
S 034-004
(3)
Carefully move the cabin pressure selector out from the P5 panel.
S 024-013
(4)
Attach tags to identify each electrical connector to the correct location on the back of the cabin pressure selector.
(5)
Remove the electrical connectors from the cabin pressure selector.
(6)
Remove the cabin pressure selector.
S 024-014
S 024-006
TASK 21-31-01-404-007
3. Install the Cabin Pressure Selector (Fig. 401)___________________________________
A. References
(1) AMM 06-46-00/201, Entry, Service and Cargo Doors, Access Doors and Panels
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A
757
MAINTENANCE MANUAL
CABIN PRESSURE SELECTOR
SEE A
1/4 TURN
ELECTRICAL
FASTENER
CONNECTORS
(4 LOCATIONS)
A
Cabin Pressure Selector Installation
Figure 401
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