(b)  
Low shelf pressure (Ref par. E.[4]).

(c)  
Check for excessive leakage where shelf mates to plenum and at duct to plenum connection. Repair as applicable.

(7)  
Instrument panel cooling tube pressure low (test ports 12, 13, 14, 15, 16, 17, 18 or 19, but not all).

(a)  Straighten out kink in tube or remove obstruction from tube.
NOTE:  If low pressure is observed at all ports of one bank, i.e., test ports 16, 17, 18, and 19; straighten out tube or remove obstruction from tube which draws air from that bank.
(8)  
All instrument panel cooling tubes pressure low (test ports 12 thru 19).

(a) Repair leaky duct joint or straighten out kink in main instrument cooling duct.

(9)  
One or more instrument panel cooling tube pressure(s) high, other panel tube pressure(s) low.

(a)  Condition results from low tube pressure (Ref par. E.[7]).
F.  Install aluminum decal markers over test ports 1, 5, 8, and 11.
G.  Remove all test equipment from airplane.
H.  Remove electrical power if no longer required.
506 
Nov 1/75  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-58-0 Page 511 

EQUIPMENT COOLING MAIN BLOWER - REMOVAL/INSTALLATION
1. Remove Equipment Cooling Main Blower
A.  Open three EQUIPMENT COOLING BLOWER circuit breakers on circuit breaker panel P18-3.
B.  Gain access to the blower.
(1)  
Remove oxygen bottle shroud.

(2)  
Remove blower access panel.

C.  Loosen five duct clamps that secure flexible duct to blower, check valve, and ducts. (See figure 401.)
D.  Pull flexible connecting ducts away from blower.
E.  Tighten two clamps downstream from blower to secure check valve in place. If desired to remove check valve, do not tighten.
F.  Disconnect equipment cooling main blower electrical connector.
G.  Loosen two duct clamps which secure blower to support.
H.  Remove equipment cooling blower.
2.  Install Equipment Cooling Main Blower
A.  Place equipment cooling blower on support and secure with two structural support clamps. (See figure 401.)
NOTE: Check that flow indicating arrow on equipment cooling blower points down.
B.  Connect equipment cooling blower electrical connector.
C.  Loosen check valve clamps and pull flexible ducts back over blower.
D.  Place all clamps in position and tighten clamp nuts 15 to 20 pound-inches.
E.  Replace access panel and shroud removed in step 1.B.
F.  Close three EQUIPMENT COOLING BLOWER circuit breakers.
G.  Test equipment cooling system. Refer to 21-58-0.
Nov 15/67 21-58-11 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Equipment Cooling Blower Installation  500 
21-58-11  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EQUIPMENT COOLING ALTERNATE BLOWER - REMOVAL/INSTALLATION
1.  General
A.  Proceed same as in removing/installing equipment cooling main blower, except open or close BLOWER ALTERNATE circuit breaker on circuit breaker panel P18.
500 
Feb 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-58-21 Page 401 

AUTOMATIC FLOW CONTROL VALVE - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Glass Cloth Adhesive Tape, Minnesota Mining and Manufacturing Company No. 361
B.  Cleaning Solvent per BMS 3-2
2.  Remove Flow Control Valve
A.  Remove screws and remove floor panel (Fig. 401).
B.  Remove V-band clamps at both ends of valve.
C.  Remove tape attaching movable flange to duct.
D.  Slide movable flange away from valve.
E.  Remove clamp attaching valve to structure.
F.  Remove valve.
G.  Remove and store gaskets.
3.  Install Flow Control Valve
A.  Position the valve with the valve position indicator angled in a forward down position.
(1)  
Make sure the flow arrow points at the air exhaust port.

(2)  
Rotate the valve so that the floor panel sill does not touch the valve.

B.  Install the gaskets.
C.  Loosely install clamp attaching valve to structure.
D.  Clean areas of flange and duct to be taped with cleaning solvent.
E.  Slide movable flange against valve and apply one lap of adhesive tape between flange and duct. Pull tape taut and smooth while applying.
　
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