(2)
AMM 24-22-00/201, Electrical Power Control
(3)
AMM 25-50-03/401, Bulkhead Lining
C.
Access
(1)
Location Zones
153/154 Aft Cargo Compartment
D.
Procedure
S 424-010
(1)
Put the actuator (3) against the actuator support frame (7) and install the actuator bolts (8), and washers (9).
(a)
Tighten the actuator bolt (8) to 55-65 pound-inches. Increase torque as necessary to align the lockwire holes.
(b)
Install the lockwire.
S 434-006
CAUTION:_______MAKE SURE THE HEAD OF BOLT (10) IS ON THE INBOARD SIDE. IF THE HEAD OF THE BOLT IS NOT ON THE INBOARD SIDE, THE PRESSURE OUTFLOW VALVE MAY NOT WORK.
(2)
Align the actuator arm (15) with the connecting rod (17) and install the bolt (10), washer (12) and nut (13).
S 434-012
(3)
Connect the AC and DC motor electrical connectors (1, 4).
S 434-013
(4)
Connect the electrical connector (5) to the potentiometer (6).
(a) Tighten the nut (13) to 17 pound-inches. Increase torque as
necessary to align the cotter pin holes.
(b) Install the pin (14).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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757
MAINTENANCE MANUAL
S 864-014
(5) 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
S 704-015
(6) Do a test of the outflow valve actuator.
(a) Supply electrical power (AMM 24-22-00/201).
(b) Set the CABIN ALTITUDE CONTROL MODE SELECT switch on the
pilot's overhead panel, P5, to MAN.
ú (c) Turn and hold the CABIN ALTITUDE CONTROL MANUAL selector to
DESCEND.
ú 1) Make sure the VALVE position indicator moves to full-closed
ú (CL) in the subsequent 30 seconds.
(d) Make sure the outflow valve is fully closed.
(e) If the outflow valve is not fully closed, adjust the actuator
arm:
1) Loosen the nuts on the connecting rod and the rotating tube
to engage with the actuator drive link as shown in
Fig. 401.
(f) Set the CABIN ALTITUDE CONTROL MODE SELECT switch on the P5
panel to AUTO 1.
ú (g) Make sure the outflow valve moves to full-open (OP).
(h) Set the CABIN ALTITUDE CONTROL MODE SELECT switch on the P5
panel to MAN.
ú (i) Turn and hold the CABIN ALTITUDE CONTROL MANUAL selector to
DESCEND.
ú 1) Make sure the VALVE position indicator moves to full-closed
ú (CL) in the subsequent 30 seconds.
(j) Make sure the outflow valve is closed.
(k) Set the CABIN ALTITUDE CONTROL MODE SELECT switch on the P5
panel to AUTO 2.
(l) Make sure the outflow valve moves to full open.
S 414-018
(7) Install the aft endliner, if applicable (AMM 25-50-03/401).
S 414-016
(8) Close the No. 2 cargo door, 822 (AMM 06-46-00/201) or the outflow
valve doors.
S 864-017
(9) Remove electrical power, if it is not necessary.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-31-04
ALL ú ú 02.1 Page 405 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
OUTFLOW VALVE ACTUATOR AC MOTOR - REMOVAL/INSTALLATION
______________________________________________________
1. General_______
A. This procedure has instructions to remove and install the actuator AC motors that are on the cabin pressure outflow valve. You can get access to the motors through the cabin pressure outflow valve or through the bulk cargo compartment. Only use the access through the cabin pressure outflow valve when it is not possible to get access through the bulk cargo compartment.
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