(2)
Install the Cabin Pressure Outflow Valve
(3)
Clean the Cabin Pressure Outflow Valve
(4)
Do a Check of the Cabin Pressure Outflow Valve
TASK 21-31-03-002-001
2. Remove the Cabin Pressure Outflow Valve (Fig. 201)_______________________________________
A. General
(1)
You can remove the outflow valve through the aft end of the bulk cargo compartment or from the out side of the airplane. The valve is most easily removed through the cargo compartment. The procedure to remove the valve from the out side of the airplane is used when access through the bulk cargo compartment is not possible.
(2)
To remove the valve from the out side of the airplane, the valve must be in the closed position.
B.
References
(1)
AMM 24-22-00/201, Electric Power Control
(2)
AMM 06-46-00/201, Entry, Service and Cargo Doors Access Doors and Panels
(3)
AMM 25-50-03/401, Bulkhead Lining
C.
Access
(1)
Location Zones
165 Area aft of bulk cargo compartment (Left)
D.
Prepare for the Removal
S 862-002
(1)
Open these circuit breakers, on the overhead circuit breaker panel P11, and attach the 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 012-003
(2)
If the outflow valve will be removed through the bulk cargo compartment, do the steps that follow:
(a)
Open the aft cargo door, 822 (AMM 06-46-00/201).
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21-31-03
ALL ú ú 03 Page 201 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
2. GEARBOX 4. DC MOTOR
ELECTRICAL
CONNECTOR
3. AC MOTORS
SEE A 5. POTENTIOMETER
1. AC MOTORS ELECTRICAL ELECTRICAL
CONNECTORS CONNECTOR
6. DC MOTOR AND
POTENTIOMETER
9. BONDING JUMPER
7. ACTUATOR SUPPORT
FRAME
8. ACTUATOR BOLT
15. FLAPPER DOORS (2 PLACES)
A
14. INNER SKIN A
13. VALVE INBD FWD 10. SCREW 11. WASHER 12. NUT
A
FRAME 20. VALVE (22 PLACES) 16. NUT PLATE 1 TORQUE SCREWS TO 35-40 IN-LBS.
17. GASKET
19. AIRPLANE 18. SCREWS (22 PLACES) 1
OUTER SKIN
A-A
Cabin Pressure Outflow Valve Installation Figure 201
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21-31-03
ALL ú ú 01 Page 202 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(b) Remove the endliner at the aft end of the bulk cargo compartment (AMM 25-50-03/401).
S 862-004
(3)
If you will remove the valve from the out side of the airplane, make sure that the valve is in the closed position.
(a)
If the valve cannot be closed, you must remove the valve through the bulk cargo compartment.
E.
Remove the outflow valve.
S 032-005
(1)
Remove the screws (18) that are on the out side of the airplane.
S 032-006
(2)
Disconnect the bonding jumper (9) from the valve (13).
(a)
To access the bonding jumper from the out side the airplane, carefully push the forward edge of the valve (13) inboard.
S 032-007
(3)
Disconnect the electrical connectors (1) from the valve motors (3). Identify the electrical connectors for installation.
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