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E.  Remove heated gasket from outflow valve body, if installed. Do not break wire leads. If necessary to replace heated gasket refer to 21-31-12, MP.
F.  Bring outflow valve down through opening and out of airplane.
4.  Install Cabin Pressurization Outflow Valve
A.  Lift outflow valve through opening in airplane and position valve with actuator electrical receptacles facing forward.
B.  Install heated gasket on outflow valve body.
C.  Connect electrical connectors to actuators.
D.  Slide forward end of outflow valve under latches and lower aft end of valve into place.
E.  Insert bit in each screwhead and rotate clockwise until stop has been contacted. Tighten opposite latches until each latch has been tightened.
F.  Apply a fillet seal around outflow valve opening. Fillet seal should extend 0.60 inch on to outflow valve body on the forward and aft edges and 0.30 inch on to the outflow valve body around the rest of the opening.
G.  Close circuit breakers opened in 3.A
H.  Provide electrical power.
I.  Place L and R PACK switches to OFF.
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Cabin Pressurization Outflow Valve  501 
21-31-11 Page 402  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/88 

500  Cabin Pressurization Outflow Valve 
Feb 20/88  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-31-11 Page 403 

J.  Move pressurization control system mode selector to MAN-DC.
K.  Move FLT/GRD switch to GRD.
L.  Position MANUAL toggle switch to CLOSE and observe that VALVE position indicator shows valve closing.
M.  Close aft outflow valve with MANUAL toggle switch and check that forward outflow valve is closed and forward outflow valve light illuminates.
N.  Position mode selector switch to AUTO and observe that VALVE position indicator shows valve moves to full open. Check that forward outflow valve is open and forward outflow valve light extinguished.
O.  Remove electrical power if no longer required.
501 
21-31-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/88 

CABIN PRESSURIZATION OUTFLOW VALVE - APPROVED REPAIRS
1. General
A.  This repair procedure replaces the outflow valve frame seals while the outflow valve is installed on the airplane.
2.  Equipment and Materials
A.  Cleaning Solvent (Ref 20-30-31)
(1)  
Methyl Ethyl Ketone - TT-M-261

(2)  
Isopropyl Alcohol - TT-I-735

B.  Adhesive - BAC5010 Type 71 (Furane 8543, Ciba-Geigy)
C.  Weight Tool - 715853-1-T4 (Hamilton Standard)
3.  Repair Outflow Valve Frame Seals (Fig. 801)
A.  Operate the outflow valve until it is fully open:
(1)  
Supply electrical power.

(2)  
Make sure these circuit breakers on the P6 panel are closed:

(a)  
AUTOMATIC AC and DC

(b)  
STBY AC and DC

(c)  
MAN AC and DC

 

(3)  
Put the FLT-GRD switch on the pressurization control panel to GRD.

(4)  
Put the mode selector switch to DC MAN.

(5)  
Close the LANDING GEAR - LIGHTS circuit breaker on the P6 panel.

(6)  
Move and hold the manual outflow valve toggle switch to OPEN until the outflow valve is completely open.

B.  Open these circuit breakers on the P6 panel and install collars:
(1)  
AUTOMATIC AC and DC

(2)  
STBY AC and DC

(3)  
MAN AC and DC

500 
Oct 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-31-11 Page 801 

A89984
Cabin Pressurization Outflow Valve  500 
21-31-11Page 802   Figure 801 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/92 

C.  Use a sharp edged plastic or wood tool to remove the remaining outflow valve frame seal from the frame seal groove.
D.  Clean the frame seal groove with methyl ethyl ketone or isopropyl alcohol to remove all traces of the adhesive. Use a clean, lint-free cloth to remove the solvent residue before it dries.
　
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