H28976
Cargo Compartment Ceiling Blowout Panel Installation  500 
21-32-41  Figure 401 (Sheet 1)  Aug 15/68 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

NOTE: Check the following is stenciled on the blowout panels.
On the upper side (Aft Compartment Only)
"PUSH DOWN FOR EMERGENCY ACCESS TO CARGO COMPARTMENT."
On lower side
"CONTROLLED PRESSURE RELIEF PANEL"
"ENGAGE EDGES BETWEEN 0.20 AND 0.25 INCHES AND TIGHTEN RESTRAINING BOLTS
20 TO 25 POUNDS-INCHES TORQUE"

500  Cargo Compartment Ceiling Blowout Panel Installation 
Aug 15/68  Figure 401 (Sheet 2)  21-32-41 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Install Cargo Compartment Ceiling Blowout Panel
A.  If a blowout panel is damaged and must be replaced and a new blowout panel is not available, a new blowout panel may be fabricated as follows:
(1)  
Use same material or equivalent as existing panel.

(2)  
Cut material to approximate size; leave blowout panel slightly oversized.

(3)  
Position blowout panel in opening. Install cap strip and tighten bolts only enough to engage cap strips.

(4)  
Mark the edge of the cap strips on the blowout panel. Remove cap strips.

(5)  
Draw a line between 0.20 and 0.25 inches out from the original line. Trim off excess material.

B.  Place blowout panel in mounting position against depressor strip. Check that blowout panel is correctly positioned so stenciling is on the correct side. (See figure 401.)
C.  Install cap strips, but do not tighten.
D.  If blowout panel was marked during removal, position blowout panel so that lines previously drawn, line up with the edge of the cap strips.
E.  Check that blowout panel edge engagement with cap strip is between 0.20 and 0.25 inches. Tighten restraining bolts to 20 to 25 pound-inches torque.
CAUTION:  TO ENSURE CORRECT BLOWOUT FUNCTION OF PANEL, CORRECT EDGE ENGAGEMENT AND TIGHTENING OF RESTRAINING BOLTS ARE MOST IMPORTANT.
500 
21-32-41 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/68 

BULKHEAD BLOWOUT PANELS - REMOVAL/INSTALLATION
1. Remove Panel (Fig. 401)
A. Remove screws from retaining frame and remove frame.
B. Remove decompression grille.
C. Remove valve plate, seal and retainer.
2. Install Panel (Fig. 401)
A. Position valve plate and seal in opening. Check that valve plate is properly seated in the seal.
B. Position decompression grille in front of the valve plate.
C. Position retaining frame over grille and valve plate and install screws.

500 Bulkhead Blowout Panel Installation
Feb 1/76 Figure 401 21-32-51 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

PRESSURIZATION INDICATION AND WARNING - DESCRIPTION AND OPERATION
1.  General
A.  The pressurization indication and warning system, which consists of lights, indicators and a cabin altitude warning system, permits monitoring of the cabin pressurization control system during its operation and provides aural and visual warning in case of pressurization system malfunction (Ref 21-31-0, Description and Operation).
B.  The following indicator lights are installed on the forward overhead panel and obtain power through 28 v dc Bus No. 1.
(1)  
The AUTO FAIL light indicates an automatic transfer from the automatic pressurization control mode.

(2)  
The OFF SCHED DESCENT indicates the airplane is descending prior to obtaining the flight altitude as selected by the FLT ALT selector when operating in the AUTO mode.

(3)  
The STANDBY light indicates that the pressurization control system is operating in the standby mode.

(4)  
The MANUAL light indicates that the pressurization control system is operating in the manual mode.

C.  The outflow valve position indicator is installed on the forward overhead panel and is powered from the precision 20-volt supply in the pressure controller.
D.  The cabin altimeter and differential pressure indicator are combined in one instrument on the forward overhead panel, and powered directly by differential pressure. The altimeter and differential pressure indicator registers cabin altitude and pressure difference between cabin and ambient.
E.  The cabin rate of climb indicator is installed on the forward overhead panel and powered directly by differential pressure. The indicator registers rate of pressure change in the cabin.
　
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