S 862-031
(1)
Open these circuit breakers, on the pilots' 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 012-032
(2)
If you will clean the outflow valve from the bulk cargo compartment, do the steps that follow:
(a)
Open the aft cargo door, 822 (AMM 06-46-00/201).
(b)
Remove the endliner at the aft end of the bulk cargo compartment (AMM 25-50-03/401).
S 862-033
(3)
If you will clean the valve from the out side of the airplane, make sure that the valve is in the open position.
(a)
If the valve cannot be opened, you must clean it from the bulk cargo compartment.
F.
Clean the outflow valve.
S 122-034
(1)
Use the brush and the solvent to clean all of the outflow valve assembly.
(a)
Make sure the wiper seals on the sides, front, and rear of the valve door are clean. They must not have any gummy deposits and must be able to move easily within their retaining slots.
S 112-035
(2)
Rub the door gates and the seals of the outflow valve with the solvent.
S 162-036
(3)
Dry the outflow valve with the cloth.
G.
Put the airplane back to its usual condition.
S 412-037
(1)
If the valve was cleaned from the bulk cargo compartment,
do the steps that follow:
(a)
Install the endliner on the aft end of the bulk cargo compartment (AMM 25-50-03/401).
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21-31-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
(b) Close the aft cargo door, 822 (AMM 06-46-00/201).
S 862-046
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(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
TASK 21-31-03-202-038
5. Do a Check of the Cabin Pressure Outflow Valve (Fig. 201)______________________________________________
A. General
(1)
You can inspect the outflow valve from the aft end of the bulk cargo compartment or from the out side of the airplane. Access to the outflow valve is most easily done from the out side of the airplane. However, to inspect the valve from the out side of the airplane, the valve must be fully open.
B.
References
(1)
AMM 06-46-00/201, Entry, Service, and Cargo Doors Access Doors and Panels
(2)
AMM 24-22-00/201, Electrical Power Control
(3)
AMM 25-50-03/401, Bulkhead Lining
C.
Access
(1)
Location Zones
165 Area aft of bulk cargo compartment (Left)
D.
Prepare to do the check.
S 862-039
(1)
Open these circuit breakers, on the pilots' 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 012-040
(2)
If the outflow valve will be inspected from the bulk cargo compartment, then do the steps that follow:
(a)
Open the aft cargo door, 822 (AMM 06-46-00/201).
(b)
Remove the endliner at the aft end of the bulk cargo compartment (AMM 25-50-03/401).
S 862-041
(3)
If the valve will be inspected from the out side of the airplane, make sure that the valve is in the open position.
(a)
If the valve cannot be opened, it must be inspected from the bulk cargo compartment.
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