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 3.  System Pressure Indicator (Fig. 1)_________________________
 A.  The dual needle pressure indicator (gage) (on airplanes without engine instrumet system) is on the lower part of the P3 panel. The two digital pressure indicators (on airplanes with engine instrument system) are on the P2 panel. The pressure indicator shows from 0 to 4000 psi. The pressure indicator gets its signal from the pressure transmitter and shows the applicable system A or B pressure.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

RED GREEN YELLOW

 

 

 

AIRPLANES WITHOUT ENGINE INSTRUMENT SYSTEM AIRPLANES WITH ENGINE INSTRUMENT SYSTEM
Pressure Indication Circuit Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HYDRAULIC PRESSURE INDICATING SYSTEM - TROUBLE SHOOTING
_______________________________________________________
 1.  General
_______
 A.  The pressure transmitters for systems A and B are installed near the respective system pressure module units and transmit signals to a dual indicator located on the first officer's panel. The standby hydraulic system is not provided with a pressure indication system, but is equipped with a low pressure warning system.
 B.  Before trouble shooting hydraulic pressure indicating systems, ensure that the applicable hydraulic system is within normal pressure tolerances. Tolerance of the hydraulic pressure reading shown on the dual pressure indicator is |100 psi.
 2.  Fault Isolation and Correction
______________________________ ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | .................................................................................
 |High or Low |Pressure indica-|pressure |tor |reading | | | | | | | | | | | | | | | | | | |Transmitter | | | | | | | | |Zero |Open circuit or |pressure |no electrical |indication |power | | | | | | | | | | | |Transmitter | | | | |Replace installed indica-|tor with a tested indica-|tor. Pressurize applicable|system and compare read-|ings. Tolerance of indi-|cators is |20 psi. If|comparative reading between|indicators is not in|tolerance, removed indi-|cator is defective| |If comparative reading |between indicators is in |tolerance, transmitter |is defective| |Check SYSTEM A-B PRESSURE |circuit breaker on P6 load |control panel| |Still no pressure indica-|tion after ensuring elec-|trical power is applied| |If electrical circuitry |is all right, transmitter |is defective |Replace indi-||cator|| || || || || || || || || ||Replace trans-||mitter||(Ref 29-31-12).|| || ||Close circuit||breaker|| || ||Make continuity||check|| || ||Replace trans-||mitter (Ref||29-31-12)|
 2..............…..................…............................…................1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HYDRAULIC PRESSURE INDICATOR - REMOVAL/INSTALLATION
___________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is to remove the hydraulic pressure indicator. The second task is to install the hydraulic pressure indicator.
 B.  The hydraulic pressure indicator is found on the lower part of the P3 panel. The indicator is installed into the panel from the front and is held in position with clamps.
 TASK 29-31-11-004-001
 2.  Hydraulic Pressure Indicator Removal
____________________________________
 A.  Access
　
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