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____ C21001-5 Tube and P/N C21001-4 Tubing in a box. These three P/N's already exist as part of Test Equipment P/N C21001-12 or -16 and may be salvaged if an upgrade to the recommended kit is desired.
 Use with the items that follow:
 (a)  
220-02PSI Netech Digimano 2000 Precision Pressure/Vacuum Meter Netech Corporation 60 Bethpage Drive Hicksville, NY 11801 Phone: 516-433-7458 Fax: 516-433-7458

 (b)  
Thermometer - 0 to 160°F range with accuracy to |2°F

 (2)  C21001-16 Equipment Cooling System Performance Test Set (alternative)
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A 737-300/400/500MAINTENANCE MANUAL

INBD

USE STATIC PROBE TO MEASURE PRESSURE
EFIS Equipment Cooling System Test Ports Figure 501
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A

737-300/400/500
MAINTENANCE MANUAL

PROBE
____ ARROWS SHOW AIRFLOW DIRECTION.
NOTE:
ALWAYS INSERT PROBE INTO DUCT OR
 PLENUM WITH THE PROBE TIP FACING
 UPSTREAM. VARY PROBE POSITION
 SLIGHTLY IN ALL DIRECTIONS TO GET
 THE MAXIMUM PRESSURE READINGS
 (SMALLEST NEGATIVE PRESSURE).

PROBE POSITIONING

NOTE: 1. DO NOT USE PRESSURE PROBE
2.
 1/8" PLASTIC TUBE 2-3 INCHES INTO END OF SUCTION
 TUBE. DO NOT INSERT TUBE MORE THAN 3 INCHES.

3.
 MAKE SURE THAT PLASTIC TUBE IS HELD IN SUCH
 A MANNER THAT FINGERS OR HANDS CANNOT
 RESTRICT FLOW AT END OF SUCTION TUBE.

 

PRESSURE GAGE
Static Pressure Probe and Measurement Methods Figure 502
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Pressure Correction BAROMETRIC PRESSURE (IN. HG)

A737-300/400/500MAINTENANCE MANUAL
Gage Pressure Correction Chart
Figure 503

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1.  
Obtain local ambient barometric pressure (Pbar).

2.  
Measure E/E bay air temperature (Tbay).

3.  
Locate E/E bay temperature on left axis of table and follow row to the column corresponding to the Barometric pressure.

Read the correction factor (Cf). 
4. Calculate the corrected pressure (Pcor) 
as follows:
Pcor = P*Cf (Where:  P is measured  E/E 
pressure)  Bay 
_______Example Temp 
O2P = 2.6 IN. H  (`F) 
Pbar = 3.01 IN. HG 
Tbay = 46`F 
From table:  (45`F/30.2 IN. HG) Cf = 0.95 
2O2O*0.95 = 2.47 IN. HPcor = 2.6 IN. H 
NOTE____ 
For ambient conditions outside the range of 
the table, the correction factor must be 
calculated as follows: 

10  28.7  29.0  29.3  29.6  29.9  30.2  30.5  30.8 
0.93  0.92  0.91  0.90  0.89  0.88  0.87  0.86 
15  0.94  0.93  0.92  0.91  0.90  0.89  0.88  0.87 
20  0.95  0.94  0.93  0.92  0.91  0.90  0.89  0.88 
25  0.96  0.95  0.94  0.93  0.92  0.91  0.90  0.89 
　
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