(2)  
Access Panels (Ref 12-31-21/201, 12-31-31/201, 12-31-41/201) 3303/3403 Air Conditioning Access Panel 3804 APU Cowl Door 4405/4406 Forward Cargo Door Access Panel 4505/4506 Aft Cargo Door Access Panel

 D.  Prepare To Repair the Insulation Blanket for the Pneumatic Duct
 S 868-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 (2)  
Remove the pneumatic power (Ref 36-05-00/201).

 S 018-004

 (3)  
Open the applicable access doors.

 S 868-003
 E.  Repair the Insulation Blanket
 S 968-008
 (1)  The insulation blanket must be replaced (Ref 36-19-25/401), if the damage condition is as follows:
 (a)  If more than 75 percent of the circumference of the insulation blanket is torn.
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737-300/400/500MAINTENANCE MANUAL
 (b)  If there is more than 25 percent (approximately 1 inch) of the fiberglass batt gone from the insulation blanket.
 S 358-009
 (2)  Put the tape on the torn part of the insulation blanket.
 NOTE: You must be careful not to compress the insulation
____ blanket more than necessary. The surface temperature of the insulation blanket will be higher when the blanket is compressed.
 (a)  Make sure the tape will extend around the torn part of the insulation blanket a minimum of one inch in all directions.
 F. Put the Airplane to Its Usual Condition
 S 418-010
 (1)  
Close the access doors.

 S 868-011

 (2)  
Remove the electrical power if it is not necessary (Ref
 24-22-00/201).

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737-300/400/500MAINTENANCE MANUAL
 ENGINE BLEED PRESSURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________________________
 1.  General_______
 A.  A pressure indication system, consisting of two transmitters and a dual pressure indicator, is provided for the pressure indication of the engine bleed system. Each transmitter is connected to a sensing line which is connected to the pneumatic manifold downstream from the bleed air heat exchanger. Both transmitters are electrically connected to the dual pressure indicator on the overhead panel which has two pointers marked L and R for the left and right system respectively. One transmitter is sensing engine No. 1 bleed air pressure and the other senses engine No. 2 bleed air pressure (Ref Fig. 1).
 B.  Each transmitter has two ports. One port is for the pressure sensing line from the pneumatic manifold and the other port is the vent to ambient. Next to the ports there is a zero set hex nut. The zero set hex nut is used to adjust the transmitter to obtain a zero indication on the indicator with no pressure in the ducts.
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A 737-300/400/500MAINTENANCE MANUAL
TO CABIN TEMPERATURE CONTROL VALVES AND
PRIMARY HEAT EXCHANGERS

APU
GROUND WTAIAPU BLEED
GROUND WTAIPACK FLOWPACK FLOW
SOLENOID VALVESOLENOID VALVEAIR VALVE
CONTROL AND CONTROL AND
SHUTOFF VALVESHUTOFF VALVE PRECOOLER
PRECOOLER
CONTROLCONTROL
RELIEFVALVE
VALVE
VALVE
TO TURBOFANAPU BLEED
CONTROL VALVE
FAN TO WING

AIR CHECKTO WING
　
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