PRESSURE GAGE
Static Pressure Probe and Measurement Methods Figure 503
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A 737-300/400/500MAINTENANCE MANUAL
PRESSURE CORRECTION METHOD
1.
 OBTAIN AMBIENT BAROMETRIC PRESSURE BY SETTING FIELD ELEVATION ON PILOT OR COPILOT ALTIMETER AND READING PRESSURE FROM BAROMETRIC CORRECTION SCALE.

2.
 DETERMINE P-AMBIENT FROM GRAPH NO. 1. ENTER GRAPH NO. 1 WITH TEMPERATURE OF ELECTRICAL/ELECTRONICS COMPARTMENT AND AMBIENT BAROMETRIC PRESSURE. READ P-AMBIENT.

0.09
3.
 ENTER GRAPH NO. 2 WITH PRESSURE READ AT TEST PORT AND P-AMBIENT. READ CORRECTED PRESSURE AT TEST PORT

4.
 EXAMBLE: TEMPERATURE E/E COMPT-100`F AMBIENT PRESSURE = 28 IN. HG. PRESSURE READING AT TEST PORT = 3 IN. H O.

2
 . FROM GRAPH NO. 1, P-AMBIENT = 0.0665
 . FROM GRAPH NO. 2, CORRECTED NEGATIVE PRESSURE = 3.45 IN. H O
2

0.08
0.07
0.0665
0.06
0.05
3
P-AMBIENT (LB/FT )
TEMPERATURE - E/E BAY AMBIENT (`F) GRAPH NO. 1 Gage Pressure Correction Graphs Figure 504 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
NEGATIVE PRESSURE - IN. H O (GAGE)
2 GRAPH NO. 2 Gage Pressure Correction Graphs Figure 504 (Sheet 2)

.055
.06
.065
.07
.075 .08 .085
3
P-AMBIENT (LB/FT )
CORRECTED PRESSURE (IN. H O)
2
4.0
3.45
3.0
2.0
1.0
0
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A 737-300/400/500MAINTENANCE MANUAL
PORT TEST  IN. H20 PRESS GAGE  IN. H20 CORRECTED PRESS GAGE  IN. H20 PRESS ACCEPTABLE MIN.  PRESS STATUS CORRECTED 
OK  HIGH LOW OR 
1  2.6 
2  0.5 
3  1.0 
4  2.3 
5  1.0 
6  0.8 
7  2.1 
8  0.5 
9  0.5 
10  0.8 
11  0.4 
12  0.4 
13  0.4 
14  0.4 
15  0.4 
16  0.4 
17  0.4 
18  0.4 
19  1.0 
20  1.0 
21 (IRU-1)  1.4 
22 (IRU-2)  1.4 

Test Data Sheet
Figure 505

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 B.

C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
Special Tools and Equipment
 (1)  C21001-16 Equipment Cooling System Performance Test Set (recommended)
 C21001-1 Equipment Cooling System Performance Test Set
 (alternative)

 or items (a) thru (d) listed below (alternative):
 (a)  
510e Digital Pressure Gage (alternative)
 MPM500e Digital Pressure Gage (alternative)
 Solomat Instrumentation Division
 Stamford, CT 06906

 FA141710 Portable differential Pressure Gage - 0 to 10 inches of water (alternative) Wallace and Tiernan Belleville, NJ
　
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